🧩 Step 5 — Concept Integration

🧭 Whole Topic Core Flow

Whole Topic Core Flow

Glucose-6-Phosphate
↓
Pentose Phosphate Pathway Activated
↓
Oxidative Phase → NADPH Production
↓
Reduced Glutathione Maintained
↓
Protection Against Reactive Oxygen Species
↓
Normal RBC Membrane Stability
↓
Normal Oxygen Transport

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G6PD Deficiency
↓
Reduced NADPH Formation
↓
Failure to Regenerate Reduced Glutathione
↓
Oxidative Damage to Hemoglobin & RBC Membrane
↓
Heinz Bodies + Bite Cells
↓
Hemolytic Anemia
↓
Jaundice + Dark Urine + Fatigue

────────────────────────────────

Oxidative Drugs
(Sulfonamides, Primaquine)
↓
Increase Oxidative Stress
↓
Precipitate Hemolysis in G6PD Deficiency

────────────────────────────────

Avoid Trigger Drugs + Supportive Care
↓
Reduced Oxidative Injury
↓
Prevention of Hemolytic Crisis

2️⃣ Core Mechanism Integration

Main Functional Failure Mechanism

G6PD Enzyme Deficiency
        ↓
Impaired Oxidative Phase of PPP
        ↓
Reduced NADPH Production
        ↓
Reduced Glutathione Cannot Be Regenerated
        ↓
Hydrogen Peroxide & Free Radicals Accumulate
        ↓
Oxidative Injury to Hemoglobin
        ↓
Heinz Body Formation
        ↓
Splenic Macrophage Removal of Damaged RBC Portions
        ↓
Bite Cells Form
        ↓
RBC Membrane Fragility
        ↓
Hemolysis
        ↓
Anemia + Jaundice + Fatigue

⚡ Ultra-High-Yield Master Summary

• PPP occurs in cytoplasm and does not produce ATP.
• Oxidative phase generates NADPH.
• Non-oxidative phase forms ribose sugars.
• RBCs depend entirely on PPP for antioxidant protection.
• G6PD is the rate-limiting enzyme.
• NADPH maintains reduced glutathione.
• Oxidative stress causes Heinz body formation.
• Sulfa drugs and antimalarials can precipitate hemolysis.
• Transketolase requires thiamine.
• PPP links biochemistry with hematology, pharmacology, and clinical medicine