Fast breathing (>60/min) or severe chest indrawing
Fever / hypothermia
Jaundice in first 24 hrs or severe/progressive
Bleeding from any site
7. Summary Table – Routine vs Abnormal Newborn Care
Step
Normal Routine Care
Abnormal / At-Risk Adjustments
Thermal protection
Skin-to-skin, warm room
Incubator/KMC for preterm, strict monitoring
Feeding
Early breastfeeding, exclusive
NG feeds in preterm, early glucose monitoring in IDM
Vitamin K & Eye care
Universal
Same, no change
Immunization
Birth vaccines
Delay only if critically ill
Monitoring
Vitals, urine, stool
Add glucose, Ca++, sepsis screen as indicated
Screening
Jaundice, hearing, CHD
Expanded metabolic panels in high-risk
Resuscitation
Rarely needed
Asphyxia: follow NRP
Key Point:
Routine newborn care aims at thermal protection, early feeding, infection prevention, and parental education. For abnormal newborns, routine care continues but with added monitoring, supportive interventions, and early detection of complications.
Clinical Note – Routine Newborn Care
Date / Time: _________
Name: Baby of _________
Sex: Male / Female
Age: ___ hours / days
Gestation: ___ weeks (Term / Preterm)
Birth Weight: ______ g
Delivery: Normal vaginal / LSCS / Instrumental
Apgar: ___ at 1 min, ___ at 5 min
Review of Systems / Examination
General: Alert, active / lethargic / irritable
Color: Pink / jaundiced / cyanosed / pale
Cry: Normal / weak / absent
Vital Signs:
Temp: ___ °C
HR: ___ /min
RR: ___ /min
SpO₂: ___ %
Anthropometry: Weight ___ g, Length ___ cm, HC ___ cm
Definition: Abnormally high pressure within the rigid, non-compliant skull cavity.
Normal ICP Range: to 15 mmHg (Supine adult). Pressures >20 mmHg are generally considered pathological and require intervention.
The Monro-Kellie Doctrine: States that the total volume within the cranial vault is fixed and is comprised of three components:
Brain Parenchyma (∼80%)
Cerebrospinal Fluid (CSF) (∼10%)
Intracranial Blood (∼10%)
Compensation: An increase in the volume of one component must be offset by a decrease in one or both of the other components to maintain a stable ICP.
Initial compensation primarily involves displacement of CSF into the spinal subarachnoid space and compression of cerebral veins.
2. Pathophysiology and Mechanisms
Pressure-Volume Curve (Compliance):
High Compliance (Initial Phase): Small increases in volume cause minimal change in ICP (flat part of the curve) due to compensatory mechanisms.
Low Compliance (Decompensation): Once compensation is exhausted, the curve becomes steep; a small increase in volume causes an exponential increase in ICP.
Cerebral Perfusion Pressure (CPP): The net pressure gradient causing blood flow to the brain. Maintenance is critical for preventing secondary brain injury.
Formula: CPP=MAP−ICP (Mean Arterial Pressure minus Intracranial Pressure).
Goal: Maintain CPP typically >60 mmHg. If ICP increases, CPP decreases, leading to ischemia.
Causes of Raised ICP:
Mass Lesions: Tumors (primary/metastatic), hematomas (epidural, subdural, intracerebral), cerebral abscesses.
Cerebral Edema:
Vasogenic: Breakdown of the blood-brain barrier (e.g., tumors, infection, trauma).
Cytotoxic: Cellular swelling due to ischemia (e.g., stroke, hypoxia, DKA).
Hydrocephalus: Impaired CSF flow or absorption (e.g., subarachnoid hemorrhage, meningitis, obstruction of the aqueduct of Sylvius).
Decline in Glasgow Coma Scale (GCS). Fixed, dilated pupils (Uncal herniation). Posturing (decorticate or decerebrate).
4. Diagnosis and Monitoring
Neuroimaging (Initial):
CT/MRI: Essential to identify underlying cause (mass lesion, hemorrhage, edema, hydrocephalus) and signs of herniation.
Warning: Lumbar Puncture (LP) is ABSOLUTELY CONTRAINDICATED in the presence of a known or suspected mass lesion or signs of herniation, as it can precipitate transtentorial or tonsillar herniation.
ICP Monitoring (Gold Standard):
External Ventricular Drain (EVD): Provides continuous ICP measurement, allows sampling of CSF, and permits therapeutic drainage of CSF to lower ICP.
Fiber Optic Transducers: Devices placed in the parenchyma or subdural space.
5. Management (Tiered Approach)
The primary goal is to maintain CPP>60 mmHg and ICP<20 mmHg.
Tier 0: General and Supportive Measures
Positioning: Head of bed elevation to 30 degrees (promotes venous outflow).
Vitals: Maintain Normothermia (fever increases metabolism and ICP). Treat pain and agitation (sedation/analgesia).
Hemodynamics: Maintain normovolemia and MAP (to support CPP).
Tier 1: First-Line Therapies
CSF Drainage: If an EVD is in place, initiate continuous or intermittent CSF drainage.
Hyperosmolar Therapy: Creates an osmotic gradient to draw water out of the brain parenchyma into the intravascular space.
Mannitol (0.25 to 1.0 g/kg IV bolus): Requires intact blood-brain barrier (BBB) and maintenance of serum osmolarity <320 mOsm/L.
Hypertonic Saline (e.g., 3% or 23.4%): Draws fluid from brain, increases MAP, and avoids the rebound ICP effect sometimes seen with Mannitol.
Tier 2: Second-Line Therapies (If ICP remains
>20 mmHg)
Ventilation: Controlled, transient hyperventilation (Target pCO230−35 mmHg). Causes cerebral vasoconstriction, rapidly reducing CBV and ICP. Use cautiously as it can cause ischemia.
Diuresis: Repeat hyperosmolar therapy.
Tier 3: Third-Line Therapies (Refractory ICP)
Barbiturate Coma (e.g., Pentobarbital): Decreases cerebral metabolic rate and CBV (powerful vasoconstrictor). Requires continuous EEG monitoring and full ICU support.
Decompressive Craniectomy: Surgical removal of a portion of the skull to allow the edematous brain to swell outward, physically reducing pressure.
Hypothermia: Induced mild hypothermia (Controversial; used in select, severe cases).
6. Complications
Cerebral Herniation: Life-threatening displacement of brain tissue due to severe pressure gradient.
Uncal Herniation: Medial temporal lobe (uncus) through the tentorial notch. Causes ipsilateral fixed and dilated pupil (CN III compression) and contralateral hemiparesis.
Tonsillar Herniation: Cerebellar tonsils through the foramen magnum. Compresses the brainstem, leading to cardiorespiratory arrest.
Secondary Brain Injury: Ischemia and infarction caused by critically low CPP.
Central Diabetes Insipidus/SIADH/Cerebral Salt Wasting: Endocrine/electrolyte disturbances often associated with severe brain injury.
Variable difficulty 120 Multiple-Choice Questions (MCQs) to practice now(High yeild)
Table of Contents(toc)
Set 1 (Initial 20 Questions)
Question: Which of the following is the most common cause of acute bronchitis?
A) Bacterial infection
B) Viral infection
C) Allergens
D) Smoking
Answer: B) Viral infection
Question: What is the most likely complication of untreated hypertension (high blood pressure)?
A) Stroke
B) Asthma
C) Acute Glomerulonephritis
D) Tuberculosis
Answer: A) Stroke
Question: A 50-year-old male presents with chest pain, sweating, and pain radiating to the left arm. What is the most probable diagnosis?
A) Angina
B) Myocardial Infarction (Heart Attack)
C) Pericarditis
D) Aortic Dissection
Answer: B) Myocardial Infarction
Question: Which of the following is a common side effect of thiazide diuretics (water pills) used to manage hypertension?
A) Hyperkalemia (High Potassium)
B) Hypokalemia (Low Potassium)
C) Hypercalcemia (High Calcium)
D) Hyponatremia (Low Sodium)
Answer: B) Hypokalemia
Question: Which of the following conditions is most associated with iron deficiency anemia?
A) Sickle Cell Anemia
B) Hemophilia
C) Chronic Blood Loss
D) Leukemia
Answer: C) Chronic Blood Loss
Question: Which of the following is NOT a symptom of Parkinson’s disease?
A) Tremors
B) Bradykinesia (Slow movement)
C) Hyperreflexia (Overactive reflexes)
D) Muscle Rigidity
Answer: C) Hyperreflexia
Question: A 45-year-old woman presents with unexplained weight gain, fatigue, and cold intolerance. She is diagnosed with hypothyroidism. What is the most likely cause?
Question: Which of the following is the first-line treatment for acute gout (a sudden, painful attack)?
A) Allopurinol
B) Colchicine
C) NSAIDs (Nonsteroidal Anti-inflammatory Drugs)
D) Steroids
Answer: C) NSAIDs
Question: A patient presents with fever, cough, and weight loss. A chest X-ray shows cavitary lesions in the upper lobes of the lungs. What is the most likely diagnosis?
A) Pneumonia
B) Tuberculosis (TB)
C) Bronchial Carcinoma (Lung Cancer)
D) Chronic Bronchitis
Answer: B) Tuberculosis
Question: Which of the following is the hallmark (primary indicator) of diabetic ketoacidosis (DKA)?
A) Hyperglycemia (High blood sugar)
B) Metabolic Alkalosis
C) Hypercalcemia
D) Hypoglycemia (Low blood sugar)
Answer: A) Hyperglycemia
Question: What is the most common presenting symptom of a cerebrovascular accident (CVA), commonly known as a stroke?
A) Seizure
B) Sudden headache
C) Sudden loss of vision
D) Sudden weakness or paralysis
Answer: D) Sudden weakness or paralysis
Question: Which of the following is a major risk factor for developing ischemic heart disease (IHD)?
A) Hypothyroidism
B) Hyperthyroidism
C) Hyperlipidemia (High cholesterol/fats in blood)
D) Anemia
Answer: C) Hyperlipidemia
Question: Which of the following is the most common cause of peptic ulcer disease?
A) NSAIDs (medication)
B) Stress
C) H. pylori infection
D) Alcohol consumption
Answer: C) H. pylori infection
Question: A 40-year-old female presents with abdominal pain, jaundice (yellowing skin), and swelling in the abdomen (ascites). What is the most likely diagnosis?
Question: What is the first-line medical treatment for hyperthyroidism (overactive thyroid) in the setting of Graves’ disease?
A) Radioactive iodine
B) Methimazole
C) Propylthiouracil (PTU)
D) Beta-blockers
Answer: B) Methimazole
Question: What is the primary cause of chronic obstructive pulmonary disease (COPD)?
A) Air pollution
B) Tobacco smoking
C) Occupational exposure
D) Genetic factors
Answer: B) Tobacco smoking
Question: Which of the following is a primary prevention strategy for colorectal cancer?
A) Screening for blood in stool
B) High-fiber diet
C) Chemotherapy
D) Surgical resection
Answer: B) High-fiber diet
Question: What is the most common pathogen (germ) causing bacterial pneumonia in children?
A) Streptococcus pneumoniae
B) Haemophilus influenzae
C) Mycoplasma pneumoniae
D) Staphylococcus aureus
Answer: A) Streptococcus pneumoniae
Question: Which of the following types of chronic viral hepatitis is a major cause of cirrhosis in adults?
A) Hepatitis A
B) Hepatitis B
C) Hepatitis C
D) Hepatitis E
Answer: C) Hepatitis C
Question: What is a typical presentation of someone suffering from a myocardial infarction (heart attack)?
A) Sudden onset of shortness of breath
B) Persistent chest pain radiating to the left arm
C) Pain in the upper abdomen
D) Severe headache and blurred vision
Answer: B) Persistent chest pain radiating to the left arm
Set 2 (Questions 21–40)
Question: Which of the following is a common complication of tuberculosis (TB)?
A) Pneumothorax (Collapsed lung)
B) Lung Abscess
C) Asthma
D) Pneumonia
Answer: B) Lung Abscess
Question: A patient presents with fatigue, pallor, and tachycardia (rapid heart rate). Laboratory tests reveal microcytic anemia (small red blood cells). What is the most likely cause?
A) Vitamin B12 deficiency
B) Iron deficiency
C) Folate deficiency
D) Sickle cell anemia
Answer: B) Iron deficiency
Question: What is the first-line treatment for anaphylaxis (a severe, life-threatening allergic reaction)?
A) Antihistamines
B) Intravenous fluids
C) Epinephrine
D) Corticosteroids
Answer: C) Epinephrine
Question: Which of the following is the most common cause of acute renal (kidney) failure in hospitalized patients?
A) Pre-renal causes (e.g., severe dehydration or low blood flow)
B) Post-renal causes (e.g., obstruction)
C) Intrinsic renal causes (damage to the kidney itself)
Question: A 65-year-old male presents with shortness of breath, orthopnea (difficulty breathing when lying flat), and peripheral edema (swelling in the legs). What is the most likely diagnosis?
A) Chronic obstructive pulmonary disease
B) Congestive heart failure
C) Asthma
D) Pulmonary embolism
Answer: B) Congestive heart failure
Question: What is the hallmark (primary indicator) of metabolic syndrome?
A) Hypotension
B) Hyperglycemia (High blood sugar)
C) Hyperkalemia
D) Hyperlipidemia
Answer: B) Hyperglycemia
Question: Which of the following conditions is most commonly associated with polycythemia vera (a blood cancer characterized by too many red blood cells)?
Question: A 3-year-old child presents with a barking cough and stridor (high-pitched breathing sound). What is the most likely diagnosis?
A) Epiglottitis
B) Croup
C) Bronchiolitis
D) Pneumonia
Answer: B) Croup
Question: What is the most likely diagnosis for a patient presenting with a “butterfly” rash, joint pain, and a positive antinuclear antibody (ANA)?
A) Rheumatoid arthritis
B) Systemic lupus erythematosus (SLE)
C) Osteoarthritis
D) Ankylosing spondylitis
Answer: B) Systemic lupus erythematosus
Question: Which of the following is a major risk factor for deep vein thrombosis (DVT)?
A) Smoking
B) Hypothyroidism
C) Physical inactivity (Immobility)
D) Hypercalcemia
Answer: C) Physical inactivity
Question: A 60-year-old female presents with sudden onset of weakness in the right arm and leg. She has a history of hypertension. What is the most likely diagnosis?
A) Seizure
B) Stroke (Cerebrovascular accident)
C) Peripheral artery disease
D) Hypoglycemia
Answer: B) Stroke
Question: What is the first-line medication treatment for major depressive disorder?
A) Cognitive Behavioral Therapy (CBT)
B) Electroconvulsive Therapy (ECT)
C) Selective Serotonin Reuptake Inhibitors (SSRIs)
D) Antipsychotic medications
Answer: C) Selective Serotonin Reuptake Inhibitors (SSRIs)
Question: What is the most common pathogen responsible for bacterial meningitis in adults?
A) Neisseria meningitidis
B) Streptococcus pneumoniae
C) Haemophilus influenzae
D) Listeria monocytogenes
Answer: B) Streptococcus pneumoniae
Question: What is the most common cause of acute pancreatitis (inflammation of the pancreas)?
A) Viral infections
B) Gallstones
C) Alcohol consumption
D) Autoimmune diseases
Answer: B) Gallstones
Question: A 45-year-old woman with a history of rheumatoid arthritis presents with dry mouth, dry eyes, and difficulty swallowing. What is the most likely diagnosis?
A) Systemic lupus erythematosus
B) Sjogren’s syndrome
C) Osteoarthritis
D) Scleroderma
Answer: B) Sjogren’s syndrome
Question: Which of the following is NOT a cause of liver cirrhosis?
A) Chronic hepatitis B infection
B) Chronic alcoholism
C) Non-alcoholic fatty liver disease
D) Cholelithiasis (Gallstones)
Answer: D) Cholelithiasis
Question: A 40-year-old male presents with pain in his lower back and reduced range of motion. X-ray shows vertebral collapse. What is the most likely infectious diagnosis in a setting of bone and joint issues?
A) Osteoarthritis
B) Rheumatoid arthritis
C) Tuberculosis of the spine (Pott’s disease)
D) Compression fracture
Answer: C) Tuberculosis of the spine
Question: A child presents with a persistent cough, wheezing, and chest tightness, which improve with bronchodilators. What is the most likely diagnosis?
A) Bronchitis
B) Asthma
C) Pneumonia
D) Tuberculosis
Answer: B) Asthma
Question: A patient presents with a painful, swollen joint, especially in the big toe. What is the most likely diagnosis?
A) Rheumatoid arthritis
B) Gout
C) Osteoarthritis
D) Septic arthritis
Answer: B) Gout
Question: Which of the following is a common side effect of long-term corticosteroid use?
A) Osteoporosis
B) Hypertension
C) Hyperglycemia
D) All of the above
Answer: D) All of the above
Set 3 (Questions 41–60)
Question: What is the first-line medication treatment for an acute exacerbation (sudden worsening) of Chronic Obstructive Pulmonary Disease (COPD)?
A) Antibiotics
B) Oxygen therapy
C) Bronchodilators
D) Steroids
Answer: C) Bronchodilators
Question: A 55-year-old male presents with a history of chest pain, sweating, and nausea. The ECG shows ST elevation. What is the most likely diagnosis?
A) Acute myocardial infarction (STEMI)
B) Angina
C) Aortic dissection
D) Pulmonary embolism
Answer: A) Acute myocardial infarction
Question: Which of the following is a common microvascular (small blood vessel) complication of diabetes mellitus?
A) Stroke
B) Cataracts
C) Retinopathy (Damage to the eyes)
D) Osteoarthritis
Answer: C) Retinopathy
Question: What is the most common cause of bacterial pneumonia in adults?
A) Streptococcus pneumoniae
B) Staphylococcus aureus
C) Haemophilus influenzae
D) Mycoplasma pneumoniae
Answer: A) Streptococcus pneumoniae
Question: Which of the following is a characteristic feature of rheumatoid arthritis?
A) Pain and swelling in large joints
B) Joint deformities in small joints of hands and feet
C) Pain in weight-bearing joints
D) Absence of morning stiffness
Answer: B) Joint deformities in small joints of hands and feet
Question: A patient presents with weakness, muscle cramps, and ECG changes of peaked T waves. What is the most likely diagnosis?
A) Hyperkalemia (High potassium)
B) Hypokalemia (Low potassium)
C) Hypercalcemia
D) Hypocalcemia
Answer: A) Hyperkalemia
Question: A 30-year-old woman presents with a butterfly-shaped rash on her face, photosensitivity (sensitivity to light), and joint pain. What is the most likely diagnosis?
A) Systemic lupus erythematosus (SLE)
B) Rheumatoid arthritis
C) Dermatomyositis
D) Psoriasis
Answer: A) Systemic lupus erythematosus
Question: A 45-year-old male with a history of alcohol abuse presents with jaundice, ascites (abdominal fluid), and spider angiomata (spider veins). What is the most likely diagnosis?
A) Hepatitis B
B) Hepatic cirrhosis
C) Pancreatitis
D) Non-alcoholic fatty liver disease
Answer: B) Hepatic cirrhosis
Question: What is the most appropriate initial treatment for status epilepticus (a prolonged seizure or multiple seizures without recovery)?
A) Oral anticonvulsants
B) IV diazepam or lorazepam (Benzodiazepines)
C) IV fluids
D) Intramuscular phenytoin
Answer: B) IV diazepam or lorazepam
Question: A 5-year-old child presents with a history of fever, painful swollen joints, and a rash. This constellation of symptoms after a throat infection suggests which diagnosis?
A) Rheumatic fever
B) Kawasaki disease
C) Systemic lupus erythematosus
D) Chickenpox
Answer: A) Rheumatic fever
Question: Which of the following is a common cause of acute glomerulonephritis (kidney inflammation) in children following a throat or skin infection?
A) Staphylococcus aureus
B) Escherichia coli
C) Group A Streptococcus (Post-streptococcal glomerulonephritis)
D) Pseudomonas aeruginosa
Answer: C) Group A Streptococcus
Question: What is the most common presentation of a myocardial infarction (heart attack) in a diabetic patient?
A) Severe chest pain
B) Shortness of breath
C) Asymptomatic or mild symptoms (Silent MI)
D) Nausea and vomiting
Answer: C) Asymptomatic or mild symptoms
Question: A 35-year-old woman presents with abdominal pain, weight loss, and a palpable mass in her abdomen. What is a serious malignancy that should be considered?
A) Ovarian cyst
B) Colorectal carcinoma (Colon cancer)
C) Irritable bowel syndrome
D) Acute pancreatitis
Answer: B) Colorectal carcinoma
Question: A patient presents with complaints of a new mole that is Asymmetrical, with irregular Borders, has multiple Colors, and a large Diameter (ABCDE rule). What is the most likely diagnosis?
A) Squamous cell carcinoma
B) Melanoma
C) Basal cell carcinoma
D) Seborrheic keratosis
Answer: B) Melanoma
Question: A patient presents with a painful red eye and blurred vision after trauma. The slit-lamp exam reveals hypopyon (pus in the anterior chamber). What is the most likely diagnosis?
A) Conjunctivitis
B) Corneal ulcer
C) Acute angle-closure glaucoma
D) Uveitis (Inflammation of the middle layer of the eye)
Answer: D) Uveitis
Question: Which of the following is a typical feature of asthma?
A) Unilateral chest pain
B) Wheezing and shortness of breath
C) Cyanosis and edema
D) Hemoptysis (Coughing up blood)
Answer: B) Wheezing and shortness of breath
Question: Which of the following is the treatment of choice for a patient with acute cholecystitis (inflammation of the gallbladder)?
A) Antibiotics alone
B) Surgery (cholecystectomy)
C) Endoscopic retrograde cholangiopancreatography (ERCP)
D) Percutaneous drainage
Answer: B) Surgery (cholecystectomy)
Question: A 25-year-old female presents with fever, headache, and a stiff neck. The CSF analysis shows an elevated white blood cell count, low glucose, and high protein. What is the most likely diagnosis?
A) Viral meningitis
B) Bacterial meningitis
C) Tuberculous meningitis
D) Fungal meningitis
Answer: B) Bacterial meningitis
Question: A 50-year-old male presents with jaundice, pruritus (itching), and dark-colored urine. His liver function tests show elevated bilirubin and alkaline phosphatase. What is the most likely diagnosis, indicating bile flow obstruction?
A) Acute hepatitis
B) Hepatic cirrhosis
C) Cholelithiasis
D) Cholestasis (Impaired bile flow)
Answer: D) Cholestasis
Question: A patient presents with sudden onset of severe, colicky abdominal pain, bloating, and constipation. On examination, there is absent bowel sounds. What is the most likely diagnosis?
A) Acute pancreatitis
B) Intestinal obstruction
C) Irritable bowel syndrome
D) Appendicitis
Answer: B) Intestinal obstruction
Set 4 (Questions 61–80, Higher Difficulty)
Question: Which of the following is the most common cause of secondary hypertension (high blood pressure caused by another condition) in young adults?
A) Pheochromocytoma
B) Renal parenchymal disease (Kidney tissue disease)
C) Coarctation of the aorta
D) Hyperaldosteronism
Answer: B) Renal parenchymal disease
Question: A patient with chronic obstructive pulmonary disease (COPD) presents with a productive cough, shortness of breath, and a barrel chest (emphysema type). Which of the following physical examination findings would you expect?
A) Decreased tactile fremitus
B) Increased tactile fremitus
C) Decreased resonance on percussion
D) Hyperresonance on percussion
Answer: D) Hyperresonance on percussion
Question: The characteristic “bamboo spine” appearance on X-ray, due to fusion of vertebrae, is associated with which of the following diseases?
A) Rheumatoid arthritis
B) Ankylosing spondylitis
C) Osteoarthritis
D) Psoriatic arthritis
Answer: B) Ankylosing spondylitis
Question: Which of the following is the first-line treatment for a patient with acute pancreatitis (inflammation of the pancreas)?
A) Intravenous fluids
B) Antibiotics
C) Surgical resection
D) Insulin therapy
Answer: A) Intravenous fluids
Question: A 40-year-old male presents with a history of fever, night sweats, and weight loss. Chest X-ray shows a cavitary lesion in the upper lobe of the lung. Which of the following is the most likely diagnosis?
A) Pulmonary tuberculosis
B) Lung cancer
C) Histoplasmosis
D) Pneumocystis pneumonia
Answer: A) Pulmonary tuberculosis
Question: What is the most common and life-threatening complication of deep vein thrombosis (DVT)?
A) Pulmonary embolism
B) Stroke
C) Myocardial infarction
D) Renal failure
Answer: A) Pulmonary embolism
Question: In a patient with suspected bacterial meningitis, which of the following is the most appropriate initial step after drawing blood cultures but before a lumbar puncture, if there are no signs of increased intracranial pressure?
A) CT scan of the brain
B) Blood cultures
C) Lumbar puncture for cerebrospinal fluid analysis
D) Administer broad-spectrum antibiotics
Answer: C) Lumbar puncture for cerebrospinal fluid analysis (Note: In practice, antibiotics are often given immediately after cultures if LP is delayed by CT scan.)
Question: Which of the following is the hallmark finding of nephrotic syndrome?
A) Hematuria
B) Proteinuria greater than 3.5 g/day
C) Hypertension
D) Hyperkalemia
Answer: B) Proteinuria greater than 3.5 g/day
Question: A 28-year-old woman presents with amenorrhea (absence of periods), hirsutism (excess hair), and obesity. She also has acne and irregular periods. The most likely diagnosis is:
A) Polycystic ovary syndrome (PCOS)
B) Primary ovarian insufficiency
C) Hyperprolactinemia
D) Pituitary adenoma
Answer: A) Polycystic ovary syndrome (PCOS)
Question: The most common presenting symptom of acute myocardial infarction (heart attack) is:
A) Palpitations
B) Chest pain
C) Shortness of breath
D) Nausea and vomiting
Answer: B) Chest pain
Question: Which of the following is the characteristic microscopic finding in Guillain-Barré syndrome (an acute paralytic illness)?
A) Wallerian degeneration
B) Axonal swelling
C) Demyelination of peripheral nerves
D) Gliosis
Answer: C) Demyelination of peripheral nerves
Question: Which of the following medications is commonly used as the initial, long-term anti-thyroid drug in the management of hyperthyroidism due to Graves’ disease?
A) Methimazole
B) Levothyroxine
C) Propylthiouracil
D) Iodine 131
Answer: A) Methimazole
Question: A patient presents with difficulty swallowing, hoarseness of voice, and a hard, non-mobile thyroid nodule. The most likely, and most aggressive, diagnosis is:
A) Benign thyroid adenoma
B) Subacute thyroiditis
C) Papillary thyroid carcinoma (Most common thyroid cancer type)
D) Hashimoto’s thyroiditis
Answer: C) Papillary thyroid carcinoma
Question: What is the most common site for an acute ischemic cerebrovascular accident (stroke)?
A) Middle cerebral artery
B) Anterior cerebral artery
C) Posterior cerebral artery
D) Vertebral artery
Answer: A) Middle cerebral artery
Question: Which of the following blood tests is the most sensitive screening tool for diagnosing systemic lupus erythematosus (SLE)?
A) Antinuclear antibody (ANA)
B) C-reactive protein (CRP)
C) Rheumatoid factor (RF)
D) Complete blood count (CBC)
Answer: A) Antinuclear antibody (ANA)
Question: A patient with a history of alcoholism presents with the triad of confusion, ataxia (uncoordinated gait), and ophthalmoplegia (eye movement abnormalities). What is the most likely diagnosis?
A) Korsakoff syndrome
B) Wernicke encephalopathy (Thiamine deficiency)
C) Alcoholic hallucinosis
D) Alcoholic liver disease
Answer: B) Wernicke encephalopathy
Question: Which of the following is the first-line rescue treatment for a patient with acute asthma exacerbation?
A) Inhaled corticosteroids
B) Oral corticosteroids
C) Beta-agonists (e.g., albuterol/salbutamol)
D) Theophylline
Answer: C) Beta-agonists (e.g., albuterol)
Question: Which of the following endocrine disorders is most likely to cause both hypo- and hyperkalemia (abnormal potassium levels) over its clinical course, though often causes hypokalemia?
A) Primary hyperaldosteronism
B) Cushing’s syndrome
C) Pheochromocytoma
D) Hyperthyroidism
Answer: A) Primary hyperaldosteronism
Question: A patient is diagnosed with tuberculosis and is started on anti-tuberculosis treatment. Which of the following is the most common, non-pathological, and easily recognizable side effect of rifampin?
A) Hepatotoxicity
B) Hemolytic anemia
C) Orange discoloration of urine
D) Nephrotoxicity
Answer: C) Orange discoloration of urine
Question: A 55-year-old male with a history of hypertension presents with sudden, severe “thunderclap” headache, vomiting, and altered mental status. On examination, he has neck stiffness. What is the most likely hemorrhagic diagnosis?
A) Subarachnoid hemorrhage
B) Ischemic Stroke
C) Meningitis
D) Acute glaucoma
Answer: A) Subarachnoid hemorrhage
Set 5 (Questions 81–100, Slightly Higher Difficulty)
Question: Which of the following is a common complication of chronic obstructive pulmonary disease (COPD) that indicates a failure of gas exchange?
A) Pulmonary embolism
B) Respiratory acidosis
C) Pleural effusion
D) Pneumothorax
Answer: B) Respiratory acidosis
Question: What is the most common cause of hyperkalemia (high potassium) in patients with acute renal failure that specifically involves direct kidney damage?
A) Metabolic alkalosis
B) Severe dehydration
C) Renal tubular acidosis
D) Acute tubular necrosis (ATN)
Answer: D) Acute tubular necrosis
Question: Which of the following is the most reliable test for definitively diagnosing active tuberculosis in a patient with a chronic cough and weight loss?
A) Sputum culture for Mycobacterium tuberculosis
B) Chest X-ray
C) Tuberculin skin test (PPD)
D) Interferon-gamma release assay (IGRA)
Answer: A) Sputum culture for Mycobacterium tuberculosis
Question: In regions like Nepal, which of the following is a common cause of hepatocellular carcinoma (liver cancer) linked to a chronic infection?
A) Chronic alcohol use
B) Hepatitis B infection
C) Non-alcoholic fatty liver disease
D) Hemochromatosis
Answer: B) Hepatitis B infection
Question: In a patient with acute pancreatitis, which of the following enzymes is typically elevated for the longest duration, making it a reliable diagnostic marker?
A) Amylase
B) Lipase
C) Alkaline phosphatase
D) Alanine aminotransferase (ALT)
Answer: B) Lipase
Question: Which of the following is a known, life-threatening complication of untreated hyperthyroidism?
A) Myxedema coma
B) Graves’ disease (The cause, not complication)
C) Thyroid storm
D) Cushing’s syndrome
Answer: C) Thyroid storm
Question: Which of the following medications is a rescue inhaler used to treat acute asthma exacerbation?
A) Long-acting beta-agonist (LABA)
B) Inhaled corticosteroids (ICS)
C) Short-acting beta-agonist (SABA)
D) Leukotriene receptor antagonists
Answer: C) Short-acting beta-agonist
Question: Which of the following is the most important first-line medication in the immediate management of a patient with an acute myocardial infarction (heart attack)?
A) Thrombolytic therapy
B) Angiotensin-converting enzyme inhibitors
C) Antiplatelet agents (Aspirin)
D) Beta-blockers
Answer: C) Antiplatelet agents (Specifically Aspirin)
Question: Which of the following is a highly specific characteristic feature of Systemic Lupus Erythematosus (SLE)?
A) Joint pain without swelling
B) Butterfly-shaped rash across the cheeks and nose (Malar rash)
C) Raynaud’s phenomenon
D) Elevated liver enzymes
Answer: B) Butterfly-shaped rash across the cheeks and nose
Question: In a patient with chronic heart failure, which of the following is the most common cause of right-sided heart failure?
A) Left ventricular failure (Most common in modern countries)
B) Pulmonary hypertension (Can be a cause, but LVF is the most common precursor)
C) Coronary artery disease
D) Aortic valve stenosis
Answer: A) Left ventricular failure
Question: Which of the following is the classic characteristic feature of Guillain-Barré syndrome (an autoimmune disorder of the peripheral nervous system)?
A) Ascending paralysis (Starting in the feet and moving up)
B) Reflex hyperactivity (Hyporeflexia/areflexia is typical)
C) Muscle weakness of the upper limbs only
D) Presence of Babinski sign
Answer: A) Ascending paralysis
Question: Which of the following is the preferred initial diagnostic test for a patient with suspected acute stroke to differentiate between ischemic and hemorrhagic causes?
A) MRI of the brain
B) CT scan of the brain without contrast
C) Cerebral angiography
D) Electroencephalogram (EEG)
Answer: B) CT scan of the brain without contrast
Question: Which of the following is the most common type of primary carcinoma (cancer) in the lungs, particularly in non-smokers and women?
A) Small cell lung cancer
B) Squamous cell carcinoma
C) Adenocarcinoma
D) Large cell carcinoma
Answer: C) Adenocarcinoma
Question: Which of the following is a typical clinical feature of acute appendicitis?
A) Severe right upper quadrant pain
B) Periumbilical pain that shifts to the right lower quadrant
C) Left lower quadrant tenderness
D) Pain with deep inspiration
Answer: B) Periumbilical pain that shifts to the right lower quadrant
Question: What is the primary cause of the elevated intracranial pressure in a patient with severe traumatic brain injury?
A) Cerebral edema (Swelling of the brain tissue)
B) Subdural hematoma
C) Epidural hematoma
D) Brain herniation
Answer: A) Cerebral edema
Question: Which of the following is a characteristic feature of Cushing’s syndrome (excess cortisol)?
A) Hypotension
B) Hypoglycemia
C) Weight gain with central obesity (Truncal obesity)
D) Hyperkalemia
Answer: C) Weight gain with central obesity
Question: What is the most common cause of bacterial meningitis in adults, specifically in community-acquired cases?
A) Streptococcus pneumoniae
B) Neisseria meningitidis
C) Haemophilus influenzae
D) Listeria monocytogenes
Answer: A) Streptococcus pneumoniae
Question: What is the most common type of anemia globally and in developing countries like Nepal?
A) Pernicious anemia
B) Iron-deficiency anemia
C) Sickle cell anemia
D) Thalassemia
Answer: B) Iron-deficiency anemia
Question: Which of the following is a long-term complication of untreated acute glomerulonephritis?
A) Chronic renal failure
B) Nephrotic syndrome
C) Renal tubular acidosis
D) Hypertension
Answer: A) Chronic renal failure
Question: Which of the following is the most common cause of upper gastrointestinal bleeding?
* A) Peptic ulcer disease
* B) Esophageal varices
* C) Gastritis
* D) Mallory-Weiss tear
* Answer: A) Peptic ulcer disease
Set 6 (Questions 101–120, Highest Difficulty)
Question: A patient presents with sudden onset of hemiparesis (one-sided weakness), aphasia (speech difficulty), and a CT scan shows a well-defined dark area (infarct) in the middle cerebral artery territory. Which of the following is the most likely diagnosis?
* A) Cerebral venous thrombosis
* B) Cerebrovascular accident (Ischemic Stroke)
* C) Meningitis
* D) Encephalitis
* Answer: B) Cerebrovascular accident
Question: Which of the following is the complete hallmark sign of diabetic ketoacidosis (DKA)?
* A) Hyperkalemia
* B) Hypoglycemia
* C) Hyperglycemia with metabolic acidosis
* D) Hyponatremia
* Answer: C) Hyperglycemia with metabolic acidosis
Question: In a patient with rheumatoid arthritis, which of the following findings is most characteristic of the earliest stages on X-ray?
* A) Joint space narrowing
* B) Bone sclerosis
* C) Subchondral cysts
* D) Osteophytes
* Answer: A) Joint space narrowing
Question: Which of the following is a common, specific, and unique feature of Graves’ disease (Hyperthyroidism)?
* A) Hypothyroidism
* B) Pretibial myxedema (Skin thickening on the shins)
* C) Goiter without exophthalmos
* D) Weight gain
* Answer: B) Pretibial myxedema
Question: A 45-year-old man presents with worsening shortness of breath, crackles (rales) on chest auscultation, and edema. His ECG shows signs of left ventricular hypertrophy. What is the most likely diagnosis?
* A) Acute myocardial infarction
* B) Chronic obstructive pulmonary disease
* C) Congestive heart failure
* D) Pulmonary embolism
* Answer: C) Congestive heart failure
Question: Which of the following is a key, highly sensitive diagnostic criterion for a diagnosis of systemic lupus erythematosus (SLE)?
* A) Positive antinuclear antibodies (ANA)
* B) Hyperkalemia
* C) Decreased creatinine clearance
* D) Absence of malar rash
* Answer: A) Positive antinuclear antibodies (ANA)
Question: What is the most appropriate initial medication for a patient in status epilepticus (prolonged or repeated seizures)?
* A) Intravenous diazepam
* B) Intravenous phenytoin
* C) Intravenous lorazepam
* D) Oral carbamazepine
* Answer: C) Intravenous lorazepam (Often preferred over diazepam due to longer duration of action)
Question: What is the most appropriate management for a patient with acute bacterial meningitis after obtaining blood cultures and immediately following a confirmed or highly suspected diagnosis?
* A) Intravenous acyclovir
* B) Intravenous antibiotics targeting Streptococcus pneumoniae (Initial broad-spectrum is often used, but S. pneumoniae is the primary target)
* C) Oral antivirals
* D) Supportive care with corticosteroids
* Answer: B) Intravenous antibiotics targeting Streptococcus pneumoniae
Question: What is the most likely cause of an isolated elevated ALT (alanine aminotransferase) level in a patient with a history of chronic alcohol consumption, where the AST:ALT ratio is typically greater than 2:1?
* A) Hepatitis B
* B) Hepatitis C
* C) Alcoholic liver disease
* D) Non-alcoholic fatty liver disease
* Answer: C) Alcoholic liver disease
Question: Which of the following is the most common organism responsible for causing hospital-acquired pneumonia (HAP), particularly in critically ill patients?
* A) Streptococcus pneumoniae
* B) Haemophilus influenzae
* C) Methicillin-resistant Staphylococcus aureus (MRSA)
* D) Mycoplasma pneumoniae
* Answer: C) Methicillin-resistant Staphylococcus aureus (MRSA)
Question: In a patient with iron-deficiency anemia, which of the following is the most likely laboratory finding that directly indicates low iron stores?
* A) Increased serum ferritin
* B) Decreased serum iron
* C) Increased serum vitamin B12
* D) Elevated mean corpuscular volume (MCV)
* Answer: B) Decreased serum iron
Question: In a patient with an acute myocardial infarction, which of the following is the most important first step in management upon presentation?
* A) Intravenous morphine
* B) Oxygen therapy
* C) Aspirin administration (Immediate antiplatelet therapy)
* D) Thrombolysis
* Answer: C) Aspirin administration
Question: Which of the following is the best indicator of proteinuria, and thus the best indicator of kidney damage, in a patient with nephrotic syndrome?
* A) Serum creatinine
* B) Urinary albumin-to-creatinine ratio
* C) Serum potassium levels
* D) Blood urea nitrogen (BUN)
* Answer: B) Urinary albumin-to-creatinine ratio
Question: Which of the following is most commonly associated with a sudden onset of pleuritic chest pain (pain with breathing), dyspnea (shortness of breath), and an elevated D-dimer level?
* A) Acute myocardial infarction
* B) Pulmonary embolism
* C) Pneumonia
* D) Tuberculosis
* Answer: B) Pulmonary embolism
Question: Which of the following is a characteristic feature of Parkinson’s disease?
* A) Hyperreflexia
* B) Resting tremor
* C) Muscle weakness
* D) Visual hallucinations
* Answer: B) Resting tremor
Question: A 50-year-old woman presents with dysphagia (difficulty swallowing), regurgitation, and weight loss. Endoscopy reveals a tumor in the lower esophagus. What is the most likely malignant diagnosis?
* A) Achalasia
* B) Gastroesophageal reflux disease (GERD)
* C) Esophageal carcinoma
* D) Esophageal varices
* Answer: C) Esophageal carcinoma
Question: Which of the following is a major local complication of acute pancreatitis that can present weeks later?
* A) Peritonitis
* B) Pancreatic pseudocyst
* C) Hepatic encephalopathy
* D) Gastrointestinal bleeding
* Answer: B) Pancreatic pseudocyst
Question: In a patient with established hypertension and persistent proteinuria (protein in the urine), which of the following is the most likely long-term renal complication?
* A) Glomerulonephritis
* B) Chronic kidney disease
* C) Nephrotic syndrome
* D) Nephritic syndrome
* Answer: B) Chronic kidney disease
Question: What is the most common cause of acute viral hepatitis in Nepal?
* A) Hepatitis A virus
* B) Hepatitis B virus
* C) Hepatitis C virus
* D) Hepatitis E virus
* Answer: D) Hepatitis E virus (The user’s previous set suggested Hepatitis A, but D is more regionally relevant for a water-borne epidemic)
Question: A patient presents with a history of fever, malaise, and a characteristic butterfly-shaped rash on the face. What is the most likely systemic autoimmune diagnosis?
How Does the Tongue Detect Taste? A Deep Dive into the Science of Flavor
Table of Contents(toc)
taste buds
Whether you’re savoring a spicy curry or cringing at a bitter cough syrup, your tongue is constantly at work—analyzing every molecule that lands on it. But how does this muscular organ decode the complex language of flavor?
Let’s take a closer look at gustation, the sense of taste, and break down the physiology and neurobiology behind it. Whether you’re a curious foodie or a budding medical student, this one’s for you.
First Things First: What Is Taste?
Taste is one of the five classical senses and refers specifically to the chemical detection of molecules by taste receptor cells (TRCs). These cells are organized within taste buds, which are found primarily on the tongue, but also on the soft palate, epiglottis, pharynx, and upper esophagus.
Gustation is distinct from flavor, which is a combination of taste, smell, texture, temperature, and even pain (think chili peppers).
The Anatomy of Taste
Taste Papillae: Where It All Begins
Your tongue isn’t smooth—it’s covered in small structures called papillae, some of which contain taste buds:
Papilla Type
Location
Taste Buds Present?
Fungiform
Tip and sides of the tongue
Yes
Foliate
Lateral posterior tongue
Yes
Circumvallate
Back of the tongue (in a V-shape)
Yes (numerous)
Filiform
Most numerous, all over tongue
No (tactile only)
Each taste bud contains 50–100 taste receptor cells, which have microvilli that project into a taste pore to sample the surrounding saliva.
The Five Basic Tastes
The human tongue can detect five primary taste modalities:
Sweet – Sugars and some amino acids
Salty – Sodium and other cations
Sour – Protons (H⁺ ions from acids)
Bitter – Often alkaloids (many toxic)
Umami – Glutamate and certain nucleotides
Contrary to popular belief, there is no “taste map” where each taste is confined to a specific region of the tongue; all taste buds can detect all five tastes to varying degrees.
The Molecular Mechanisms of Taste Detection
Here’s where things get a little more technical—perfect for those in medical training.
1. Ion Channels (for Salty & Sour)
Salty: Primarily mediated by epithelial sodium channels (ENaC). Sodium ions enter TRCs, depolarizing the cell.
Sour: Detected via proton-sensitive channels, such as PKD2L1 or via blocking potassium channels, leading to depolarization.
2. G Protein–Coupled Receptors (GPCRs) (for Sweet, Umami, Bitter)
Sweet: Detected by a heterodimer of T1R2 + T1R3.
Umami: Sensed via T1R1 + T1R3 heterodimer.
Bitter: Recognized by a diverse family of T2R receptors (about 25 different subtypes).
These GPCRs activate a signaling cascade:
Activation of gustducin (a taste-specific G protein)
Increase in intracellular IP₃ and Ca²⁺
Opening of TRPM5 channels
Depolarization of the cell
Neurotransmitter release (ATP, serotonin, etc.)
Neural Pathways: From Tongue to Brain
Taste information is carried to the brain via three cranial nerves:
Cranial Nerve
Region Innervated
VII (Facial)
Anterior 2/3 of tongue (via chorda tympani)
IX (Glossopharyngeal)
Posterior 1/3 of tongue
X (Vagus)
Epiglottis and pharynx
These afferent fibers synapse in the nucleus of the solitary tract (NST) in the medulla. From there, signals are relayed to the thalamus, and finally to the gustatory cortex in the insula and frontal operculum.
Additional Modulators: More Than Just Taste Buds
Olfaction: A huge contributor to flavor. Without it, most foods would taste flat (as anyone with a cold can attest).
Trigeminal Nerve (CN V): Detects texture, temperature, and chemical irritants (like capsaicin or menthol).
Saliva: Dissolves tastants and helps transport them into taste pores.
Your tongue is more than just a tool for enjoying food—it’s a chemically sophisticated sensory organ that plays a crucial role in nutrition, health, and even survival. For medical students, understanding the cellular and neural mechanisms of taste isn’t just fascinating—it’s foundational for diagnosing and managing a wide range of clinical conditions.
Your eyes, just like the rest of your body, have a natural pressure that helps keep them healthy and working properly. This is called intraocular pressure (IOP), which refers to the fluid pressure inside the eye.
What Is a Normal Eye Pressure?
Normal eye pressure typically ranges between 10 and 21 millimeters of mercury (mmHg). This balance is maintained by a steady flow of fluid inside the eye, known as the aqueous humor, which continuously enters and drains out.
How Is Eye Pressure Measured?
During a routine eye exam, your eye doctor will measure IOP using a special test. This check is quick and painless, but very important for monitoring eye health.
When Eye Pressure Is Too High
If your eye pressure is consistently above 21 mmHg, it’s called ocular hypertension. While this doesn’t always cause vision problems right away, it does increase the risk of developing glaucoma, a serious eye condition that can damage the optic nerve.
Daily Fluctuations
Eye pressure isn’t always constant. It can change throughout the day, often being higher in the morning. That’s why regular monitoring is important if you’re at risk.
Why It Matters
Keeping eye pressure within the normal range is key to protecting your vision. Regular eye exams help catch problems early and reduce the risk of conditions like glaucoma.
Summary
Definition: The fluid pressure within the eye, measured in millimeters of mercury (mmHg).
Normal Range: 10–21 mmHg. Maintained by balanced production and drainage of aqueous humor.
Assessment: Routinely measured during ophthalmic examinations.
Clinical Considerations:
Ocular Hypertension: IOP >21 mmHg; associated with increased risk of glaucoma.
Diurnal Variation: IOP may fluctuate, often peaking in the morning hours.
Significance: Maintaining IOP within normal limits is essential for preserving optic nerve integrity and preventing glaucomatous damage.
Definition:
A potentially fatal shift in fluids and electrolytes that occurs in malnourished patients when nutritional support (oral, enteral, or parenteral) is started too rapidly.
Pathophysiology:
Starvation → body switches to fat and protein metabolism, ↓ insulin, ↑ catabolism.
Refeeding with carbohydrate → ↑ insulin secretion → rapid cellular uptake of phosphate, potassium, magnesium.
Leads to hypophosphatemia (hallmark), hypokalemia, hypomagnesemia, thiamine deficiency, sodium/water retention.
Results in multi-system dysfunction.
Risk factors:
Severe malnutrition (BMI <16, >10% weight loss in 2–3 months).
Little or no intake >5–7 days.
Anorexia nervosa, cancer cachexia, chronic alcoholism, prolonged fasting, postoperative patients.
भिटामिन B3 ले फ्याटी लिभर रोगलाई नियन्त्रण गर्ने सम्भावना : नयाँ अनुसन्धानको उपलब्धि
Table of Contents (toc)
विश्व जनसंख्याको करिब ३० प्रतिशतलाई प्रभावित गर्ने मेटाबोलिक–एसोसिएटेड फ्याटी लिभर डिजिज (MASLD) हालसम्म प्रभावकारी लक्षित उपचारविहीन रोगका रूपमा परिचित थियो। तर, हालै गरिएको एक क्रान्तिकारी अनुसन्धानले यस रोगसँग सम्बन्धित प्रमुख आनुवंशिक कारण पत्ता लगाएको छ, र अझ चमत्कारिक कुरा त यो हो कि यसलाई नियन्त्रण गर्न सबैभन्दा प्रभावकारी औषधि भिटामिन B3 (नायसिन) भएको प्रमाणित भएको छ।
अनुसन्धानकर्ताहरूको खोज
दक्षिण कोरियाको युएनआइएसटी (UNIST) का प्रोफेसर जाङ ह्युन छोईको नेतृत्वमा, पुसान नेशनल युनिभर्सिटी (PNU) का प्रोफेसर ह्वायोङ युन र उल्सान युनिभर्सिटी अस्पताल (UUH) का प्रोफेसर न्युंग ह्वा पार्कको सहकार्यमा बनेको टोलीले पहिलो पटक विश्वस्तरमा MASLD को विकास र प्रगतिको क्रममा माइक्रोआरएनए–९३ (miR-93) को भूमिका स्पष्ट पारेका छन्।
miR-93 को प्रभाव
miR-93 लिभरका हेपाटोसाइट्स मा हुने विशेष RNA हो जसले केही लक्ष्य जीनहरूको अभिव्यक्तिलाई दवाउँछ। अनुसन्धानमा फ्याटी लिभर भएका बिरामी र जनावर दुवैमा miR-93 असामान्य रूपमा बढेको पाइएको छ।
यसले SIRT1 नामक जीनलाई रोक्दै लिभरको बोसो metabolism मा अवरोध गर्छ, जसका कारण लिभरमा बोसो जम्ने, सुजन बढ्ने र फाइब्रोसिस हुने अवस्था देखा पर्छ।
जनावरमा गरिएको परीक्षण
miR-93 लाई हटाइएका मुसामा लिभरमा बोसो जम्ने समस्या उल्लेख्य रूपमा घट्यो, साथै इन्सुलिन संवेदनशीलता र लिभर कार्यसम्बन्धी सूचकमा पनि सुधार आयो। उल्टै, miR-93 बढाइएका मुसामा लिभरको चयापचय अवस्था झन् बिग्रिएको देखियो।
भिटामिन B3 को चमत्कारिक प्रभाव
१५० वटा FDA–स्वीकृत औषधिहरूमध्ये, नायसिन (भिटामिन B3) ले miR-93 लाई सबैभन्दा प्रभावकारी रूपमा दबाउने देखियो। नायसिन सेवन गरिएका मुसामा miR-93 स्तर उल्लेख्य रूपमा घट्यो र SIRT1 सक्रिय भयो। यसले लिभरको बिग्रिएको बोसो चयापचयलाई पुनः सामान्य अवस्थामा ल्यायो।
अनुसन्धान टोलीका अनुसार,
“यस अध्ययनले MASLD को आणविक कारणलाई ठ्याक्कै स्पष्ट पारेको छ, साथै पहिले नै प्रयोगमा रहेको सुरक्षित भिटामिनलाई पुनःउपयोग गरेर उपचारमा नयाँ सम्भावना देखाएको छ।”
उपचारमा सम्भावना
नायसिन पहिले नै हाइपरलिपिडेमिया (रगतमा बोसो बढ्ने अवस्था) उपचारका लागि प्रयोग हुने सुरक्षित औषधि भएकाले, यो भविष्यमा MASLD का लागि संयुक्त उपचार (combination therapy) मा प्रयोग गर्न सकिने ठूलो सम्भावना देखिएको छ।
प्रकाशन र योगदान
यो अनुसन्धानलाई कोरिया नेशनल रिसर्च फाउन्डेशन (NRF) र कोरिया रिसर्च इन्स्टिच्युट अफ बायोसाइन्स एण्ड बायोटेक्नोलोजी (KRIBB) को सहयोग प्राप्त भएको थियो। अनुसन्धान नतिजा अन्तर्राष्ट्रिय ख्यातिप्राप्त जर्नल Metabolism: Clinical and Experimental मा प्रकाशित भएको छ।
अनुसन्धानमा UNIST का डा. यो हान ली र कियुन पार्क, उल्सान युनिभर्सिटी अस्पताल का प्रोफेसर जुनहो जुङ, र पुसान नेशनल युनिभर्सिटी की जिनयङ ली सह–प्रथम लेखकका रूपमा सहभागी भएका थिए।
References:
Yo Han Lee, Jinyoung Lee, Joonho Jeong, Kieun Park, Bukyung Baik, Yuseong Kwon, Kimyeong Kim, Keon Woo Khim, Haneul Ji, Ji Young Lee, Kwangho Kim, Ji Won Kim, Tam Dao, Misung Kim, Tae Young Lee, Yong Ryoul Yang, Haejin Yoon, Dongryeol Ryu, Seonghwan Hwang, Haeseung Lee, Dougu Nam, Won Kon Kim, Neung Hwa Park, Hwayoung Yun, Jang Hyun Choi. Hepatic miR-93 promotes the pathogenesis of metabolic dysfunction-associated steatotic liver disease by suppressing SIRT1. Metabolism, 2025; 169: 156266 DOI: 10.1016/j.metabol.2025.156266
Early-Onset Neonatal Sepsis refers to systemic infection occurring within the first 72 hours of life (some definitions extend up to 7 days in term neonates). It is a medical emergency characterized by a rapid progression from nonspecific signs to septic shock, multi-organ dysfunction, and death if not promptly treated.
The pathogenesis is primarily linked to vertical transmission of microorganisms from mother to infant, either intrauterine (transplacental hematogenous spread) or intrapartum (ascending infection from the genital tract during labor or delivery). Infection often develops after rupture of membranes, especially when prolonged (>18 hours), or in the setting of maternal fever, chorioamnionitis, or Group B Streptococcus (GBS) colonization.
Globally, EONNS remains a significant contributor to neonatal morbidity and mortality, particularly in low- and middle-income countries, where rates are higher due to limited access to intrapartum prophylaxis, delays in recognition, and suboptimal infection control during delivery. Mortality is highest in very low birth weight (VLBW) and preterm infants, where the immature immune system and compromised skin/mucosal barriers amplify vulnerability.
The microbiological profile varies by region. In high-income settings, GBS and Escherichia coli dominate, whereas in many developing countries, Gram-negative bacilli such as Klebsiella pneumoniae are increasingly prevalent. Importantly, EONNS often presents with respiratory distress, apnea, temperature instability, and lethargy, sometimes within minutes of birth.
Prompt diagnosis relies on high clinical suspicion, early blood cultures, and sepsis screening, followed by empiric antibiotic therapy (usually ampicillin plus gentamicin) while awaiting culture confirmation. Prevention strategies — especially maternal GBS screening and intrapartum antibiotic prophylaxis — have markedly reduced incidence in settings where implemented.
Late-Onset Neonatal Sepsis (LONNS)
Late-Onset Neonatal Sepsis refers to systemic infection occurring after 72 hours of life (or after 7 days in some term-based definitions) up to 28 days of age in term infants, and up to 44 weeks corrected gestational age in preterm infants. Unlike EONNS, its etiology is dominated by horizontal transmission of pathogens, often acquired in the hospital environment (nosocomial) or from community contacts after discharge.
LONNS frequently affects preterm and critically ill neonates in the neonatal intensive care unit (NICU), where prolonged hospitalization, mechanical ventilation, invasive procedures, and parenteral nutrition predispose to infection. Biofilm-forming organisms such as coagulase-negative staphylococci (CONS) exploit indwelling central venous catheters, while Gram-negative bacilli and fungi such as Candida spp. cause severe systemic illness, especially in extremely low birth weight (ELBW) infants.
Clinically, LONNS may have a more insidious onset than EONNS, often manifesting as apnea/bradycardia spells, feeding intolerance, abdominal distension, or subtle changes in behavior or perfusion. However, fulminant septic shock can occur, particularly in S. aureus, Klebsiella, or Pseudomonas infections. Meningitis is proportionally more common in LONNS due to delayed recognition and sustained bacteremia.
The microbial spectrum varies with hospital ecology, antibiotic use patterns, and infection control practices. In resource-limited settings, multidrug-resistant Gram-negative pathogens are a major concern, complicating empiric therapy. Common empiric regimens include vancomycin plus an aminoglycoside or ceftazidime/meropenem, tailored to local antibiograms.
Prevention of LONNS hinges on rigorous infection control measures: meticulous hand hygiene, bundle-based catheter care, minimizing unnecessary invasive devices, strict aseptic preparation of parenteral nutrition, and antimicrobial stewardship. While mortality in term infants is lower than in EONNS, LONNS remains a major cause of prolonged NICU stay, chronic lung disease, neurodevelopmental impairment, and death in preterm survivors.
Comparison Table – EONNS vs LONNS
Feature
Early-Onset Neonatal Sepsis (EONNS)
Late-Onset Neonatal Sepsis (LONNS)
Definition
Sepsis occurring within ≤72 hours of birth (some use ≤7 days in term, ≤72h in preterm)
Sepsis occurring after 72 hours (some use >7 days in term, >72h in preterm)
Primary Source of Infection
Vertical transmission from mother (intrauterine or intrapartum)
Horizontal transmission from environment, caregivers, or nosocomial sources
Mode of Transmission
Ascending infection after rupture of membranes, transplacental spread, exposure during passage through birth canal
Direct contact with infected personnel, contaminated equipment, invasive procedures
Common Risk Factors
– Maternal chorioamnionitis- Prolonged rupture of membranes (>18 h)- Maternal fever during labor- Preterm birth- GBS colonization- Low Apgar score
– Prolonged NICU stay- Indwelling central lines- Mechanical ventilation- Total parenteral nutrition (TPN)- Surgery- Cross-infection in NICU
Typical Pathogens
Term: Group B Streptococcus (GBS), E. coli, Listeria monocytogenes, Klebsiella, EnterococcusPreterm/NICU: Gram-negative bacilli (GNB), GBS
Gram-positive: Coagulase-negative staphylococci (CONS), S. aureusGram-negative: Klebsiella, E. coli, Pseudomonas, EnterobacterFungal: Candida spp. (esp. in VLBW on TPN)
Clinical Presentation
Rapid onset within first hours–days: respiratory distress, apnea, temperature instability, poor perfusion, hypotension, lethargy, seizures
More indolent onset: apnea/bradycardia spells, feeding intolerance, abdominal distension, lethargy, temperature instability, sepsis signs
CSF Findings (if meningitis)
Often presents concurrently with sepsis; E. coli, GBS common
More frequent with CONS, S. aureus, Candida; may follow prolonged bacteremia
