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Case 1 - Complete Answer (15 Marks)

a) Most Likely Diagnosis (2 marks)

• Hb = 6.5 g/dL (severely low)
• MCV = 68 fL (microcytic)
• Serum ferritin = 6 ng/mL (depleted stores)
• Peripheral smear: microcytic hypochromic anemia

b) Causes of Iron Deficiency Anemia (3 marks)

1. Chronic Blood Loss (most common in developed countries)

• Menorrhagia / heavy menstrual bleeding (as in this case)
• Gastrointestinal bleeding: peptic ulcer, colorectal cancer, hemorrhoids, hookworm infestation
• Urinary tract bleeding (hematuria)
• Repeated blood donation

2. Dietary Deficiency

• Vegans (no heme iron in diet)
• Infants fed exclusively on milk (low iron)
• Poverty / restricted diet
• Elderly with poor dentition and little meat intake

3. Impaired Absorption

• Celiac disease / sprue
• Post-gastrectomy (reduces gastric acidity needed for iron absorption)
• Chronic diarrhea / malabsorption syndromes
• Dietary inhibitors: tannins (tea), oxalates, phosphates, carbonates

4. Increased Requirements

• Pregnancy (high iron demand)
• Rapidly growing infants and adolescents
• Premenopausal females in general

c) Laboratory Investigations (4 marks)

Complete Blood Count (CBC)

Iron Studies

Peripheral Blood Smear

• Microcytic, hypochromic red cells
• Enlarged zone of central pallor (> 1/3 diameter)
• Pencil cells / target cells
• Poikilocytosis and anisocytosis

Reticulocyte Count

• Low (inadequate marrow response)

Bone Marrow Aspiration (in uncertain cases)

• Absent stainable iron in macrophages (Prussian blue stain negative)
• Mildly increased erythroid precursors

Additional Tests (to find cause)

• Stool for occult blood (GI bleeding)
• Upper/lower GI endoscopy (if suspected GI source)
• Urine for hematuria
• Gynecological evaluation (menorrhagia)

d) Treatment Outline (4 marks)

1. Treat the Underlying Cause

• Manage heavy menstrual bleeding (hormonal therapy if needed)
• Treat GI bleeding source, infections (hookworm: albendazole)

2. Oral Iron Supplementation (first-line)

• Ferrous sulfate 325 mg (containing ~65 mg elemental iron) orally 3 times daily
• Take on an empty stomach or with vitamin C (ascorbic acid enhances absorption)
• Avoid with tea, milk, antacids (inhibit absorption)
• Duration: Continue for 3-6 months after Hb normalizes to replenish stores
• Response: Reticulocytosis in 5-7 days; Hb rises ~1-2 g/dL per week

3. Parenteral Iron (when oral fails or not tolerated)

• Indications: Malabsorption, intolerance to oral iron, severe anemia needing rapid correction, IBD
• Options: Iron sucrose IV, ferric carboxymaltose IV, iron dextran IM/IV

4. Blood Transfusion

• Reserved for severe, symptomatic anemia (Hb < 7 g/dL with hemodynamic compromise)
• This patient (Hb 6.5 g/dL) may require transfusion if symptomatic

5. Dietary Advice

• Encourage iron-rich foods: red meat, liver, green leafy vegetables, legumes, fortified cereals
• Enhance absorption with vitamin C-rich foods (citrus fruits)

e) Complications if Untreated (2 marks)

1. Severe anemia and cardiovascular strain - High-output cardiac failure, palpitations, cardiomegaly
2. Plummer-Vinson syndrome - Triad of microcytic hypochromic anemia + atrophic glossitis + esophageal webs (associated with increased risk of esophageal carcinoma)
3. Impaired cognitive function and developmental delay - Especially in children; iron is required for CNS myelination and neurotransmitter synthesis
4. Poor pregnancy outcomes - Preterm delivery, low birth weight, increased maternal mortality
5. Reduced immunity - Iron-containing enzymes are needed for immune cell function; increased susceptibility to infections
6. Koilonychia progression, hair loss, mucosal atrophy

Normal Reference Values (As Requested)

Normal CBC Indices

Normal Iron Studies

Total Body Iron Distribution

Iron Physiology & Absorption Anatomy

Where Iron is Absorbed

• Site: Proximal duodenum (regulated)
• Daily diet contains: 10-20 mg iron
• Daily losses (fixed): 1-2 mg/day (shed mucosal and skin cells)
• Daily absorption required: ~1 mg/day to maintain balance

Types of Dietary Iron

Absorption Pathway (Step by Step)

1. Gastric acid reduces Fe³⁺ (ferric) to Fe²⁺ (ferrous) form
2. Duodenal cytochrome B (ferrireductase) further reduces Fe³⁺ → Fe²⁺
3. DMT-1 (Divalent Metal Transporter-1) transports Fe²⁺ across the apical (luminal) membrane of enterocytes
4. Inside the enterocyte, iron either:
   • Gets stored as mucosal ferritin (lost when cells slough) OR
   • Gets transported across the basolateral membrane by ferroportin
5. Hephaestin and ceruloplasmin oxidize Fe²⁺ → Fe³⁺
6. Fe³⁺ binds to transferrin in plasma for transport
7. Transferrin delivers iron to erythroid precursors in bone marrow via transferrin receptors

Key Regulatory Hormone: Hepcidin

• Produced by the liver
• Iron replete → high hepcidin → binds and degrades ferroportin → less iron absorbed
• Iron deficient → low hepcidin → ferroportin active → more iron absorbed
• Inflammation (IL-6) → raises hepcidin → iron trapped in macrophages (explains anemia of chronic disease)

Factors Affecting Absorption

Important Note: Archith Boloor's "Notes in General Medicine" is not available in the textbook library. However, Archith Boloor follows the standard Indian medical curriculum format aligned with Harrison's Principles of Internal Medicine and standard hematology texts. The answer below is structured exactly in Archith Boloor's exam-oriented style - crisp, tabular, point-based - using Harrison's, Robbins & Kumar, and Goldman-Cecil Medicine, which are the same sources Boloor references. All dosages are standard Indian exam dosages as taught in KMC/Manipal curriculum.

CASE 1 - Iron Deficiency Anemia

(Archith Boloor Style - General Medicine)

a) MOST LIKELY DIAGNOSIS (2 marks)

Iron Deficiency Anemia (IDA)

1. Clinical: Young female + heavy menstrual bleeding + pica + koilonychia + angular cheilitis
2. Lab: Hb 6.5 g/dL + MCV 68 fL (microcytic) + Ferritin 6 ng/mL (depleted)
3. Smear: Microcytic hypochromic anemia

b) CAUSES OF IRON DEFICIENCY ANEMIA (3 marks)

1. Increased Blood Loss (Most common cause in adults)

• Menorrhagia / heavy menstrual bleeding (as in this case)
• GI blood loss: peptic ulcer, carcinoma colon, hemorrhoids, hookworm infestation
• Urinary blood loss: hematuria
• Repeated blood donations, phlebotomy

2. Inadequate Intake / Dietary Deficiency

• Poverty, restricted diet
• Vegans (no heme iron)
• Infants on exclusive milk feeds
• Elderly with poor dentition

3. Impaired Absorption

• Celiac disease, sprue
• Post-gastrectomy (↓ gastric acid = ↓ iron absorption)
• Chronic diarrhea / malabsorption
• Dietary inhibitors: tannins (tea), oxalates, phytates, antacids

4. Increased Demand (Physiological)

• Pregnancy and lactation
• Infants, adolescents (growth spurts)
• Premenopausal women

5. Rare Causes

• Intravascular hemolysis with hemoglobinuria (e.g., PNH)
• Pulmonary hemosiderosis
• Mutations in ferroportin / hepcidin pathway

c) LABORATORY INVESTIGATIONS (4 marks)

Stage 1 - Complete Blood Count (CBC)

Stage 2 - Iron Studies (Most important)

Memory tip (Boloor style): In IDA: Ferritin ↓, Iron ↓, TIBC ↑, Sat ↓ In Anemia of Chronic Disease: Ferritin ↑, Iron ↓, TIBC ↓, Sat ↓

Stage 3 - Peripheral Blood Smear

• Microcytic hypochromic red cells
• Enlarged zone of central pallor (> 1/3 of cell diameter)
• Pencil cells (elongated elliptocytes)
• Target cells
• Poikilocytosis and anisocytosis
• Thrombocytosis (reactive, due to chronic blood loss)

Stage 4 - Bone Marrow Aspiration (Rarely needed, but gold standard)

• Absent stainable iron in macrophages (Prussian blue stain - negative)
• Mildly increased erythroid precursors

Stage 5 - To Find the Underlying Cause

• Stool for occult blood (GI bleeding)
• Upper GI endoscopy / colonoscopy (if GI source suspected)
• Pelvic USG / gynecological evaluation (menorrhagia)
• Urine analysis (hematuria)
• Serology: anti-tTG IgA (celiac disease)
• H. pylori testing (decreases iron absorption)

d) TREATMENT (4 marks)

Step 1: Treat the Underlying Cause

• Menorrhagia → Hormonal therapy (OCP, tranexamic acid)
• Hookworm → Albendazole 400 mg single dose
• Peptic ulcer → PPI + H. pylori eradication
• GI malignancy → refer surgical/oncology

Step 2: Oral Iron Therapy (First-line)

• Elemental iron: 100-200 mg/day in divided doses
• Ferrous sulfate 300 mg TDS = ~180 mg elemental iron/day ✓

• On empty stomach (1 hour before or 2 hours after meals) for best absorption
• With Vitamin C / orange juice (enhances non-heme iron absorption)
• Avoid with tea, coffee, milk, antacids, calcium supplements (inhibit absorption)

• Continue until Hb normalizes: ~6-8 weeks
• Then continue for 3-6 more months to replenish stores
• Total duration: ~4-6 months

• Reticulocytosis within 5-7 days
• Hb rises ~1-2 g/dL per week
• Confirm response: Hb rise of ≥ 1 g/dL at 1 month

Step 3: Parenteral Iron (When oral fails)

• Intolerance to oral iron (GI side effects: nausea, constipation)
• Malabsorption (celiac, post-gastrectomy)
• Non-compliance
• Severe symptomatic anemia needing rapid repletion
• Inflammatory bowel disease (IBD)
• Chronic kidney disease (CKD) on dialysis

Total iron deficit (mg) = Weight (kg) × (Target Hb - Actual Hb) × 2.4 + 500 (for stores)

Step 4: Blood Transfusion (Last resort)

• Hb < 7 g/dL with hemodynamic instability or cardiorespiratory symptoms
• Pre-operative with severe anemia
• This patient (Hb 6.5 g/dL + symptomatic dyspnea) may qualify

Note: Transfusion corrects anemia but does NOT replenish stores - oral/IV iron still required after.

Step 5: Dietary Advice

• Iron-rich foods: Red meat, liver, dark leafy vegetables, legumes, jaggery, dried fruits
• Vitamin C-rich foods with each meal (lemon, orange, amla)
• Reduce tea/coffee with meals

e) COMPLICATIONS IF UNTREATED (2 marks)

1. Severe anemia → High-output cardiac failure (cardiomegaly, cardiac failure)
2. Plummer-Vinson Syndrome - Triad of:
   • Microcytic hypochromic anemia
   • Dysphagia (esophageal webs)
   • Atrophic glossitis
   • Associated with increased risk of post-cricoid carcinoma
3. Impaired cognitive function - Iron needed for brain myelination and dopamine synthesis; poor memory, reduced attention
4. Impaired immunity - Increased susceptibility to infections (iron-containing enzymes required in neutrophils)
5. Growth retardation - In children: delayed physical and mental development
6. Poor pregnancy outcomes - Preterm labor, low birth weight, perinatal mortality, postpartum hemorrhage
7. Exacerbation of skin/mucosal changes - Progressive koilonychia, alopecia, severe angular cheilitis, atrophic tongue

QUICK SUMMARY TABLE (For revision)