Fat-Soluble Stars - A & D Spotlight
- Vitamin A (Retinol): Vision, immunity, growth.
- Deficiency (Xerophthalmia): XN (Night blind), X1A (Conj. xerosis), X1B (Bitot's spots), X2 (Corneal xerosis), X3A/B (Corneal ulcer), XS (Scar).
- 📌 Bitot's: Foamy, triangular, temporal.
- Rx (Oral, Day 0,1,14): <6m: 50K IU; 6-11m: 100K IU; ≥12m: 200K IU.
- Prophylaxis (India): 1L IU (9m), then 2L IU q6m (up to 5yr).
- Deficiency (Xerophthalmia): XN (Night blind), X1A (Conj. xerosis), X1B (Bitot's spots), X2 (Corneal xerosis), X3A/B (Corneal ulcer), XS (Scar).
- Vitamin D (Calciferol): Ca homeostasis, bone.
- Deficiency: Rickets (children), Osteomalacia.
- Signs: Craniotabes, rachitic rosary, Harrison's sulcus, wide wrists, bowed legs.
- Dx: Serum 25(OH)D <20 ng/mL; ↓Ca, ↓PO4, ↑ALP, ↑PTH.
- X-ray: Metaphyseal cupping, fraying.
- Rx: 2000-5000 IU/day (6 wks) OR Stoss: 3-6L IU single dose.
- Prophylaxis: 400 IU/day (infants), 600 IU/day (>1yr).
⭐ India's Vit A Prophylaxis: 1 Lakh IU at 9 months (with measles), then 2 Lakh IU q6 monthly till 5 years.
- Deficiency: Rickets (children), Osteomalacia.
Fat-Soluble Support - E & K Essentials
- Vitamin E (Tocopherol)
- Antioxidant; RBC protection.
- Deficiency: Prematurity, fat malabsorption (cholestasis, CF).
- Features: Hemolytic anemia, ataxia, neuropathy, retinopathy.
- Vitamin K
- For clotting factors II, VII, IX, X, Protein C & S.
- Deficiency causes:
- HDN: Early (maternal drugs), Classical (no prophylaxis, breastfed), Late (breastfed, malabsorption, ↑ICH risk).
- Malabsorption, prolonged antibiotics.
- Clinical: Bleeding. Labs: ↑PT, ↑aPTT.
- Prophylaxis: 1 mg IM at birth (term); 0.5 mg (preterm <1kg). ⭐ > Prophylactic Vitamin K (1 mg IM for term, 0.5 mg for preterm <1kg) at birth is crucial to prevent HDN, particularly late-onset with its high ICH risk.
B-Complex Breakdown - Energy & Nerve Keys
Water-soluble vitamins vital for energy metabolism, DNA/RNA synthesis, and nerve function. Deficiencies often present with overlapping signs, especially in malnourished children.
| Vitamin (B#) | Deficiency Syndrome(s) | Key Clinical Features / Buzzwords |
|---|---|---|
| Thiamine (B1) | Beriberi (Wet/Dry), Wernicke-Korsakoff | Cardiac failure (Wet); Neuropathy (Dry); Ophthalmoplegia, Ataxia, Confusion (Wernicke triad) |
| Riboflavin (B2) | Ariboflavinosis | Cheilosis, Angular stomatitis, Glossitis (magenta tongue), Corneal vascularization, Seborrheic dermatitis |
| Niacin (B3) | Pellagra (Hartnup disease, Carcinoid) | 📌 3 D's: Dermatitis (Casal's necklace), Diarrhea, Dementia; Glossitis |
| Pyridoxine (B6) | Deficiency / Isoniazid-induced | Peripheral neuropathy, Sideroblastic anemia, Seizures (infants), Cheilosis, Glossitis |
| Folate (B9) | Megaloblastic Anemia | ↑ Homocysteine, Normal Methylmalonic Acid (MMA); Neural Tube Defects (NTDs); Glossitis; No neuro symptoms (vs B12) |
| Cobalamin (B12) | Megaloblastic Anemia, Neuropathy | ↑ Homocysteine, ↑ MMA; Pernicious anemia; Subacute Combined Degeneration (SCD) of spinal cord |
Vitamin C & Context - Scurvy Savers & Schemes
-
Deficiency: Scurvy (impaired collagen synthesis).
-
Key Signs:
- Gums: Spongy, bleeding.
- Skin: Petechiae, perifollicular hemorrhages, corkscrew hair.
- MSK: Subperiosteal hemorrhage (painful), scorbutic rosary (sharp angulation).
- Poor wound healing, irritability.
-
Treatment: Vitamin C 100-300 mg/day (children).
-
Prevention: Citrus fruits, amla, guava.
⭐ Scorbutic rosary features sharp costochondral junction angulation, distinct from rickets' rounded rosary.
- Context: National schemes (ICDS, PM POSHAN) aid child nutrition.
High‑Yield Points - ⚡ Biggest Takeaways
- Vitamin A deficiency: Key signs include night blindness, Bitot's spots, and keratomalacia.
- Vitamin D deficiency: Causes rickets in children (craniotabes, rachitic rosary) and osteomalacia.
- Vitamin K deficiency: Presents as Hemorrhagic Disease of the Newborn; vital for coagulation.
- Thiamine (B1) deficiency: Leads to beriberi and Wernicke-Korsakoff syndrome.
- Niacin (B3) deficiency: Characterized by Pellagra (3Ds: dermatitis, diarrhea, dementia).
- Vitamin B12 deficiency: Results in megaloblastic anemia, neurological deficits; common in vegetarians.
- Vitamin C deficiency: Manifests as Scurvy, with bleeding gums, impaired wound healing_._
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