🚨 GAP FILL — Minimum Viable Answers 0→4-5/10 IF AMBUSHED
These aren't full answers. They're enough to NOT score zero.
🫒 MEDITERRANEAN DIET
Definition: Plant-based diet emphasizing olive oil, fruits, vegetables, legumes, whole grains, fish, moderate wine. Low red meat.
PREDIMED trial (2013): Mediterranean + extra-virgin olive oil vs low-fat → 30% reduction in major CV events
Mechanism: Anti-inflammatory (↓CRP, ↓IL-6), anti-oxidant (polyphenols), ↓LDL oxidation, improves endothelial function
Benefits: CVD ↓30%, T2DM prevention, cognitive decline protection, cancer risk ↓
Indian context: Parallels with traditional Indian diets (plant-heavy, turmeric/anti-inflammatory), but Indian diet higher in refined carbs/oils
🧂 IODINE DEFICIENCY/EXCESS
Physiology: Iodine → thyroid → T3/T4 synthesis. Trapped by NIS (Sodium-Iodide Symporter) on basolateral membrane
Deficiency: Goiter (↓T4 → ↑TSH → thyroid hyperplasia), cretinism (neurological: deaf-mutism, mental retardation; myxedematous: short stature)
Wolff-Chaikoff effect: EXCESS iodine → temporary INHIBITION of organification → transient hypothyroidism. Escape occurs normally.
Jod-Basedow: Excess iodine → hyperthyroidism in nodular goiter (autonomous nodules)
Mangalore paradox: Coastal = iodine sufficient, yet thyroid cancer + Hashimoto's MORE common. Excess iodine → autoimmune thyroiditis.
India: National Iodine Deficiency Disorders Control Programme (NIDDCP). Mandatory salt iodization. RDA 150 μg/day adult.
🥩 PEM — Kwashiorkor vs Marasmus
| Feature | Kwashiorkor | Marasmus |
|---|
| Deficiency | Protein (adequate calories) | Total calorie (protein + energy) |
| Edema | YES — pedal, pitting | NO |
| Weight | 60-80% expected | <60% expected |
| Appearance | Moon face, distended abdomen, flaky paint dermatosis, flag sign hair | Wasted, "skin and bones", old man face, baggy pants buttocks |
| Albumin | Very low | Low but relatively preserved |
| Fatty liver | YES (↓VLDL synthesis) | NO |
| Immune | Both severely impaired | Both severely impaired |
India: ICDS (Integrated Child Development Scheme), mid-day meals, WHO ORS + zinc for diarrheal complications, WHO growth charts
Management: Stabilize (hypothermia, hypoglycemia, infection), then cautious refeeding → rehabilitation → follow-up (10 steps WHO)
🐍 SNAKE VENOM — Basic Science
"Big Four" India: Russell's Viper, Common Krait, Indian Cobra, Saw-Scaled Viper
| Snake | Venom Type | Key Effect |
|---|
| Russell's Viper | Hemotoxic + vasculotoxic | DIC, AKI, capillary leak, bleeding |
| Common Krait | Neurotoxic (pre-synaptic) | Descending paralysis (ptosis → respiratory failure). Minimal local signs. |
| Indian Cobra | Neurotoxic (post-synaptic) | Local necrosis + neurotoxicity. Reversible with neostigmine. |
| Saw-Scaled Viper | Hemotoxic | Echis = ecchymosis. DIC. Most bites in India. |
Polyvalent ASV: Only treatment. Dose: 10 vials IV over 1hr. Repeat if clotting not restored by 6h (20WBCT).
20WBCT: 20-min Whole Blood Clotting Test — bedside test. Non-clotting = viper envenomation. Repeat 6-hourly.
Mangalore: Coastal agricultural belt. Krait nocturnal bites in rural sleeping. Monsoon peak. ASV at every PHC per NHSRC.
🧬 BILIRUBIN METABOLISM — Quick Framework
Source: 80% heme (senescent RBCs in spleen) → Biliverdin → Unconjugated Bilirubin (UCB, indirect)
Transport: UCB bound to albumin → liver (can't filter in kidney = no urine bilirubin)
Conjugation: Hepatocyte: UDP-glucuronosyltransferase (UGT1A1) → Conjugated Bilirubin (CB, direct, water-soluble)
Excretion: CB → bile → gut → urobilinogen (some reabsorbed = enterohepatic circulation, some → stercobilin in stool, some → urobilinogen in urine)
Unconjugated ↑: Hemolysis (Gilbert's = UGT1A1 ↓, Crigler-Najjar)
Conjugated ↑: Obstruction (gallstones, tumor), hepatocellular (Dubin-Johnson = MRP2 defect, Rotor)
🧠 HEPATIC ENCEPHALOPATHY — Quick Framework
Pathogenesis: Liver failure → ↓ammonia clearance → NH₃ crosses BBB → astrocyte: glutamine synthetase converts glutamate + NH₃ → glutamine → osmotic swelling → cerebral edema
Precipitants: GI bleed (#1), infection/SBP, constipation, drugs (sedatives, diuretics), electrolyte imbalance (hypoK → ↑renal NH₃ production)
West Haven Grades: 0 (minimal/subclinical) → I (mood change, tremor) → II (lethargy, asterixis) → III (somnolent, confused) → IV (coma)
Treatment: Lactulose (acidifies gut → NH₃→NH₄⁺ = trapped = excreted) · Rifaximin (↓gut NH₃-producing bacteria) · Treat precipitant · Protein NOT restricted long-term (branched-chain amino acids preferred)
India: Alcohol-related cirrhosis common (Karnataka toddy/arrack). Hepatitis B/C in blood transfusion era.
🔬 CLINICAL TRIALS — Quick Framework
Phases: Phase I (safety, healthy volunteers, 20-80) → Phase II (efficacy, small patient group, 100-300) → Phase III (large RCT, 1000-3000, vs standard) → Phase IV (post-marketing surveillance)
RCT: Gold standard. Randomized, controlled, (ideally double-)blinded. Minimizes bias.
Key concepts: ITT (intention-to-treat) vs Per-protocol. NNT (number needed to treat). p-value <0.05. Confidence interval.
Ethics: Informed consent, IRB/Ethics committee approval, Declaration of Helsinki, ICMR ethical guidelines 2017
India: CDSCO regulation. New Drugs and Clinical Trials Rules 2019. Compensate injury. Audio-visual consent for illiterate.
🧪 ZINC DEFICIENCY
Functions: >300 enzyme cofactor, DNA/RNA synthesis, immune function, wound healing, taste/smell
Deficiency features: Acrodermatitis enteropathica (perioral + acral rash), diarrhea, alopecia, growth retardation, hypogonadism, impaired immunity
Causes: Malnutrition, malabsorption, alcoholism, sickle cell, TPN without supplementation
Excess zinc → copper depletion → myelopathy mimicking SACD (subacute combined degeneration) — diagnostic trap!
India: WHO recommends zinc + ORS for childhood diarrhea (20mg/day × 14 days). Zinc deficiency widespread in malnourished children.
⚡ HYPERSENSITIVITY REACTIONS
| Type | Mechanism | Timing | Examples |
|---|
| I — Immediate | IgE → mast cell degranulation | Minutes | Anaphylaxis, asthma, urticaria, hay fever |
| II — Cytotoxic | IgG/IgM vs cell surface antigen | Hours | ABO transfusion rxn, AIHA, Goodpasture, Rh HDN |
| III — Immune complex | Ag-Ab complexes → complement → tissue damage | Hours-days | Serum sickness, SLE nephritis, post-strep GN, Arthus |
| IV — Delayed | T-cell mediated | 48-72h | TB skin test, contact dermatitis, graft rejection, granulomas |
Type II subtypes: IIa = cytotoxic (AIHA), IIb = stimulatory (Graves' — TSI), IIc = blocking (MG — anti-AChR)
🧫 COPPER / WILSON'S DISEASE
Wilson's: AR mutation in ATP7B gene → impaired copper excretion into bile → copper accumulates in liver, brain, cornea
Triad: Liver disease (hepatitis → cirrhosis) + Neuropsychiatric (tremor, dystonia, parkinsonism, behavioral) + Kayser-Fleischer rings (copper in Descemet's membrane)
Diagnosis: ↓Ceruloplasmin (<20 mg/dL), ↑24hr urine copper (>100μg/day), ↑hepatic copper on biopsy, KF rings on slit lamp
Treatment: D-Penicillamine (chelation — first line) or Trientine (if intolerant). Zinc acetate (blocks intestinal absorption — maintenance). Liver transplant if fulminant.
India: AR — consanguinity prevalent in some communities → higher incidence. Screen siblings. Lifelong treatment.
🏋️ OBESITY / BMI — Indian Thresholds
WHO BMI: Overweight ≥25, Obese ≥30. BUT Indian thresholds LOWER: Overweight ≥23, Obese ≥25 (Asian criteria)
Waist circumference: Indian cutoffs: Men ≥90 cm, Women ≥80 cm (vs WHO 102/88)
"Thin-fat Indian": Normal BMI but high visceral fat, insulin resistance, metabolic syndrome — South Asian phenotype
Complications: T2DM, CVD, OSA, NAFLD, OA, cancer (endometrial, colon, breast)
India burden: ICMR-INDIAB: diabetes prevalence 11.4%. Urban epidemic. NFHS-5: 24% women, 23% men overweight.
5 RETENTION ANCHORS — GAP FILLS
PREDIMED = Mediterranean diet = 30% CV reduction
Wolff-Chaikoff = excess iodine → blocks T4 (opposite of what you'd expect)
Kwashiorkor = Edema + Fatty liver (protein deficit → ↓VLDL → fat stays in liver)
Krait = PRE-synaptic (irreversible) vs Cobra = POST-synaptic (neostigmine helps)
Bilirubin: UCB = bound to albumin (no urine) → UGT1A1 conjugates → CB = water-soluble (urine dark)