Definition, Diagnostic Criteria & Classification

Question	Answer
1. Define Severe Acute Malnutrition (SAM) in children aged 6 to 59 months.	According to WHO / UNICEF / IAP criteria, a child aged 6–59 months is diagnosed with SAM if ANY ONE of the following 3 criteria is present: 1) Weight-for-Height/Length (WFH/L) < -3 Z-scores (SD) on WHO Child Growth Standards. 2) Mid-Upper Arm Circumference (MUAC) < 115 mm (11.5 cm) [Red Zone on Shakir tape]. 3) Presence of Bilateral Pitting Edema of nutritional origin (Kwashiorkor / Marasmic-Kwashiorkor), regardless of anthropometric measurements.
2. How does WHO classify SAM into Complicated vs Uncomplicated?	- Uncomplicated SAM: Child is alert, active, has a preserved appetite (passes the RUTF appetite test), has no high-grade bilateral edema (Grade + or ++ only), and has NO medical complications (no severe pneumonia, high fever, hypothermia, severe dehydration, severe anemia, hypoglycemia, or extensive skin lesions). Managed outpatient via Community-Based Management of Acute Malnutrition (CMAM). - Complicated SAM: Presence of ANY of the following: Failed appetite test (anorexia), Grade +++ edema, severe dehydration, hypothermia ($<35.5^\circ\text{C}$ rectal or $<36.0^\circ\text{C}$ axillary), hypoglycemia ($<54\text{ mg/dL}$), severe pneumonia, high fever, severe pallor, shock, or age $<6$ months. Mandates Inpatient admission to a Nutritional Rehabilitation Center (NRC).
3. How do you perform and interpret the Appetite Test?	- Procedure: Conducted in a quiet, calm area. Mother washes hands, sits comfortably with the child, and gently offers small amounts of Ready-to-Use Therapeutic Food (RUTF) from a sachet or spoon without force-feeding over a 30-minute period. - Pass: The child eagerly or steadily consumes at least the minimum weight-specific cutoff: e.g., for child weight $4-6.9\text{ kg}$, consumes at least one-third to one-half sachet ($30-50\text{ g}$). Child can be managed outpatient. - Fail: The child refuses to eat or consumes less than the threshold amount despite patient encouragement. Child MUST be admitted immediately to an NRC for F-75 nasogastric/oral feeding.
4. What are the clinical and physiological differences between Marasmus and Kwashiorkor?	- Marasmus (Balanced Calorie-Protein Starvation): Extreme wasting of muscle and subcutaneous fat ("skin and bones"), "old man / wizened facies", baggy pants sign, voracious appetite, alert/irritable, no edema, normal serum albumin, hair relatively preserved. - Kwashiorkor (Dysadaptation / Protein & Micronutrient Starvation with Oxidative Stress): Bilateral pitting pedal/facial edema, preserved subcutaneous fat, moon facies, severe apathy and misery, anorexia, flaky paint / crazy pavement dermatosis, flag sign in hair, profound hypoalbuminemia ($<2.0\text{ g/dL}$), and severe hepatic steatosis (fatty liver).
5. VIVA TRAP: Why is MUAC considered superior to Weight-for-Height for community screening?	1) Predicts Mortality Better: MUAC $<115\text{ mm}$ has a significantly higher specificity and positive predictive value for imminent child mortality than Weight-for-Height Z-score. 2) Age-Independence: MUAC changes very little between 6 months and 59 months in healthy children (growing $<1.5\text{ cm}$), making a single cutoff ($11.5\text{ cm}$) universally applicable without knowing exact chronological age. 3) Simplicity & Portability: Measured using a simple, cheap color-coded Shakir tape by frontline Anganwadi workers (ASHA), eliminating errors associated with heavy infantometers and hanging scales.

Pathophysiology & Complications

Question	Answer
6. Explain the concept of "Reductive Adaptation" in Severe Acute Malnutrition.	Reductive adaptation is the survival strategy of a starving child where all physiological and biochemical systems "downregulate" to reduce energy expenditure: 1) Basal Metabolic Rate: Reduced by $30-40\%$. 2) Cardiovascular: Myocardial atrophy, reduced stroke volume, cardiac output decreased by $50\%$, and low blood pressure (heart cannot tolerate volume overload). 3) Renal: Glomerular filtration rate and renal tubular concentrating ability are reduced; inability to excrete excess sodium or concentrated acid load. 4) Cellular Pumps: Impairment of $Na^+/K^+$-ATPase pump leads to intracellular sodium accumulation and intracellular potassium and magnesium leak. 5) Immune System: Anergy, thymic atrophy, absence of fever/leukocytosis during severe sepsis.
7. VIVA TRAP: What is the "Electrolyte Paradox" in SAM?	Intracellular Potassium Depletion with Total Body Sodium Excess. Although serum sodium may appear normal or low (dilutional hyponatremia due to leaky cell membranes and water retention), the Total Body Sodium is INCREASED. Conversely, Total Body Potassium and Magnesium are SEVERELY DEPLETED. Clinical Implication: Giving standard IV normal saline or high-sodium fluids will overload the atrophic heart and cause fatal pulmonary edema / acute heart failure. Hence, fluids for SAM contain low sodium ($45\text{ mEq/L}$ in ReSoMal) and high potassium ($40\text{ mEq/L}$).
8. VIVA TRAP: What is Refeeding Syndrome in SAM and how do you prevent it?	- Mechanism: When high calories (especially carbohydrates) are abruptly introduced after starvation, insulin surges. Insulin drives glucose, phosphorus, potassium, and magnesium into cells to initiate glycolysis and protein synthesis. This precipitates precipitous, life-threatening hypophosphatemia, hypokalemia, and hypomagnesemia within 24–72 hours, resulting in fatal cardiac arrhythmias, acute heart failure, encephalopathy, and rhabdomyolysis. - Prevention: 1) Start Low, Go Slow: Use F-75 formula during stabilization ($100\text{ kcal/kg/day}$ and $0.9\text{ g protein/kg/day}$; low osmolarity $333\text{ mOsm/L}$). 2) Never use high-calorie F-100 in Phase 1. 3) Add potassium ($3-4\text{ mEq/kg/day}$) and magnesium ($0.4-0.6\text{ mEq/kg/day}$) to all feeds from Day 1.
9. VIVA TRAP: Why should IRON NEVER be given in the Stabilization Phase of SAM?	Giving iron in Phase 1 is FATAL because: 1) Promotes Bacterial Sepsis: Malnourished children have depleted serum transferrin and lactoferrin. Administering iron results in abundant "free unbound iron" in the bloodstream, which is an essential growth nutrient for pathogenic bacteria (E. coli, Klebsiella, Salmonella), triggering fulminant septic shock. 2) Fenton Reaction & Free Radical Injury: Free iron catalyzes the generation of toxic hydroxyl free radicals via the Fenton reaction. In kwashiorkor, antioxidant defenses (glutathione, vitamin E, zinc) are already depleted, and iron causes catastrophic cell membrane lipid peroxidation and hepatocyte death. Rule: Iron ($3\text{ mg/kg/day}$) is started ONLY in Phase 2 (Rehabilitation) once appetite returns and child is gaining weight ($>10\text{ g/kg/day}$).

Guidelines & Management Protocols (WHO / IAP NRC Guidelines)

Question	Answer
10. Detail the 10 Essential Steps of Inpatient NRC Management for SAM.	1) Hypoglycemia: 10% dextrose $5\text{ mL/kg}$ IV or $50\text{ mL}$ oral 10% sugar water; feed within 30 min. 2) Hypothermia: Kangaroo Mother Care, room temp $25-28^\circ\text{C}$, warm blankets. 3) Dehydration: ReSoMal $5\text{ mL/kg}$ q30min $\times$ 2 hr, then $5-10\text{ mL/kg/hr}$ alternating with F-75. 4) Electrolytes: Supplemental potassium ($3-4\text{ mEq/kg/d}$) and magnesium ($0.4-0.6\text{ mEq/kg/d}$) in feeds. 5) Infections: Routine broad-spectrum antibiotics (Amoxicillin or Ampicillin + Gentamicin) for 7 days. 6) Micronutrients: Zinc ($2\text{ mg/kg/d}$), Folic acid ($5\text{ mg}$ stat, then $1\text{ mg/d}$), Vitamin A (single dose). NO iron in Phase 1. 7) Cautious Feeding: F-75 ($130\text{ mL/kg/day} = 100\text{ kcal/kg/day}, 0.9\text{ g protein/kg/day}$). 8) Catch-Up Growth: Transition to F-100 / RUTF ($150-220\text{ kcal/kg/day}, 4-6\text{ g protein/kg/day}$). 9) Sensory Stimulation: Play therapy, maternal emotional bonding, colorful toys. 10) Discharge & Follow-Up: Immunization, maternal counseling on energy-dense home foods.
11. What is the composition and preparation of F-75 and F-100 formulas?	- F-75 (Starter Formula): $75\text{ kcal}$ and $0.9\text{ g protein}$ per $100\text{ mL}$. Prepared with $25\text{ g}$ dried skimmed milk (DSM), $100\text{ g}$ sugar, $30\text{ g}$ vegetable oil, $20\text{ mL}$ Combined Mineral Vitamin (CMV) mix, made up to $1000\text{ mL}$ with boiled water. Osmolarity $\sim 333\text{ mOsm/L}$. - F-100 (Catch-Up Formula): $100\text{ kcal}$ and $2.9\text{ g protein}$ per $100\text{ mL}$. Prepared with $80\text{ g}$ DSM, $50\text{ g}$ sugar, $60\text{ g}$ vegetable oil, $20\text{ mL}$ CMV mix, made up to $1000\text{ mL}$.
12. What are the criteria for Transition from Phase 1 to Phase 2 (Rehabilitation)?	1) Return of Vigorous Appetite: Child drinks all F-75 feeds eagerly and demands more. 2) Subsidence of Edema: Bilateral pedal edema has reduced from Grade +++ or ++ to Grade + or nil. 3) Resolution of Acute Complications: Child is afebrile, alert, smile has returned, diarrhea controlled, no hypoglycemia or hypothermia. Process: Replace F-75 with equal volume of F-100 for 48 hours; if tolerated without diarrhea or vomiting, increase feeds by $10\text{ mL}$ per feed until catch-up growth target ($>10\text{ g/kg/day}$) is achieved.
13. What are the WHO Discharge Criteria from NRC?	1) Appetite: Good, consuming $>130-150\text{ kcal/kg/day}$ of energy-dense home foods or RUTF. 2) Edema: Completely absent for at least 14 consecutive days. 3) Weight Gain: Consistent catch-up weight gain $\ge 5\text{ g/kg/day}$ for 3 consecutive days on F-100/RUTF. 4) Anthropometric Recovery: Weight-for-Height $\ge -2\text{ SD}$ or MUAC $\ge 125\text{ mm}$ (Green zone). 5) Caregiver Competence: Mother trained on preparation of affordable local calorie-dense complementary feeds. 6) Immunizations: All age-appropriate vaccines updated.

VIVA TRAPs & Counter-Questions

Question

Answer

14. VIVA TRAP: How do you diagnose dehydration in a child with Marasmus? Why are standard signs misleading?

Standard clinical signs of dehydration are notoriously unreliable in marasmus:
- Skin pinch retracts slowly even in a well-hydrated marasmic child due to total loss of subcutaneous fat and dermal collagen elasticity.
- Eyes appear chronically sunken due to loss of retro-orbital fat pads.
- Dry mouth may be due to mouth-breathing or thrush.
Reliable Signs in SAM: Recent history of profuse watery diarrhea or acute vomiting; eagerness to drink (thirst); weak radial pulse with cold peripheries; lethargy; and immediate weight loss if baseline weight is known.

15. Counter-Question Chain: "A 14-month-old child with SAM in the NRC suddenly develops tachypnea, grunting, gallop rhythm, and enlarged tender liver on Day 3 of admission. What is your diagnosis and immediate management?"

1) Diagnosis: Acute Congestive Heart Failure / Fluid Overload (likely precipitated by excessive fluid administration, sodium overload, or rapid refeeding).
2) Step 1: STOP all IV fluids, oral feeds, and ReSoMal immediately!
3) Step 2: Administer Intravenous Furosemide at $1.0\text{ mg/kg}$ stat.
4) Step 3: Prop the child upright; administer high-flow oxygen via prongs or hood.
5) Step 4: If no response, consider blood transfusion only if severe anemia ($Hb < 4\text{ g/dL}$) is the driver, using packed red cells at $5-7\text{ mL/kg}$ slowly over 4 hours with furosemide premedication.