60-Year-Old Male, Chronic Beedi Smoker, Hb 9.5 g/dL - Iron Deficiency Anemia

Pathophysiology of IDA

1. Dietary lack - inadequate intake
2. Impaired absorption - malabsorption syndromes, post-gastrectomy
3. Increased requirement - not applicable in elderly males
4. Chronic blood loss - the dominant mechanism in this patient

Possible Causes in This Patient

1. Gastrointestinal Blood Loss (PRIORITY CONCERN)

• Smoking is an independent risk factor for gastric cancer. Multiple large cohort studies have shown significantly increased risk in smokers.
• Beedi smoke contains N-nitroso compounds which are direct gastric carcinogens.
• Smoking is associated with approximately a 1.5-2 fold increased risk of gastric cancer. (Sabiston Textbook of Surgery; Yamada's Textbook of Gastroenterology)
• Gastric cancer classically presents with IDA from occult bleeding, weight loss, and dyspepsia.

• Chronic beedi smoking damages the gastric mucosal barrier, impairs prostaglandin synthesis, and reduces pyloric sphincter tone, all of which predispose to peptic ulcers.
• H. pylori infection (common in beedi smokers with poor hygiene) both causes ulcers and independently decreases iron absorption through microerosions.
• PUD is a very common cause of chronic occult GI blood loss and IDA.

• Bidi/beedi smoking is a strong risk factor for hypopharyngeal and esophageal squamous cell carcinoma (odds ratio ~6 for bidi smoking). (Scott-Brown's Otorhinolaryngology)
• Can present with IDA due to bleeding and dysphagia-related poor nutrition.

• Common in elderly males; can cause occult bleeding and IDA. Often associated with fecal occult blood positivity. (Yamada's Textbook of Gastroenterology)

• Gastric antral vascular ectasia (GAVE)
• Small bowel lesions (NSAID-induced, Crohn's, etc.)

2. Impaired Iron Absorption

• Very relevant in this patient. H. pylori decreases gastric acidity and causes microerosions, both of which reduce iron absorption. Goldman-Cecil Medicine recommends H. pylori treatment even when the infection is found incidentally in the setting of IDA.

• Smoking can cause chronic gastritis leading to atrophy, reducing acid production and impairing iron absorption (iron requires an acidic environment for conversion from Fe³⁺ to absorbable Fe²⁺).

• Relevant in the differential; proximal duodenal biopsy should be considered if endoscopy is performed.

3. Poor Dietary Intake

• Beedi workers and smokers from lower socioeconomic backgrounds (common in India) may have iron-poor, plant-based diets with predominantly non-heme iron (only 1-2% bioavailable vs 20% for heme iron). (Robbins, Cotran & Kumar)
• Tea consumption (common in India) - tannins inhibit iron absorption.

4. Anemia of Chronic Disease (Secondary/Contributory)

• Chronic smoking causes a state of chronic inflammation with elevated hepcidin levels, which downregulates ferroportin, trapping iron in macrophages.
• However, in this case with confirmed IDA (not AOCD), this is likely a compounding factor rather than the sole cause.

5. Plummer-Vinson Syndrome

• An association of IDA, dysphagia, and esophageal webs - mentioned in Goldman-Cecil as relevant to smokers/chronic irritation. Rare but worth noting.

Diagnostic Work-Up

Treatment Options

Step 1: Treat the Underlying Cause (Most Important)

• Identify and treat the source of bleeding - colonoscopy/endoscopy-guided resection, cancer staging and management if malignancy found.
• H. pylori eradication if positive (reduces bleeding microerosions and improves iron absorption): Standard triple therapy - PPI + amoxicillin + clarithromycin x 14 days, or bismuth quadruple therapy.

Step 2: Iron Replacement

• Ferrous sulfate 325 mg once daily on empty stomach (maximizes absorption while maintaining tolerability).
• Elemental iron target: 150-200 mg/day. Ferrous sulfate 325 mg = 65 mg elemental iron.
• Ferrous fumarate, ferrous gluconate are equivalent in bioavailability.
• Duration: Continue for 4-6 months after Hb normalizes to replenish iron stores (target serum ferritin ≥50 ng/mL). (Goodman & Gilman's Pharmacological Basis)
• Ascorbic acid (Vitamin C) ≥200 mg with each dose increases absorption by at least 30%.
• Avoid with: tea, coffee, antacids, calcium supplements, milk (reduce absorption).
• Expected response: Hb rises ~1.4-1.9 g/dL per month. Reticulocyte count rises within 1 week.
• Side effects: Nausea, heartburn, constipation. Take with small amount of food if intolerable (reduces absorption slightly but improves compliance).

• Active ongoing GI blood loss exceeding oral absorption capacity
• Oral intolerance despite dose reduction
• Post-GI surgery with malabsorption
• Need for rapid repletion (pre-operative)

• Ferric carboxymaltose (FCM) - single large dose, low anaphylaxis risk
• Iron sucrose - given in divided doses
• Low molecular weight iron dextran
• Ferric gluconate

Step 3: Dietary Advice

• Increase heme iron intake (meat, poultry, fish if not contraindicated).
• Avoid tea/coffee within 1 hour of iron supplementation.
• Add citrus/ascorbic acid with meals.

Step 4: Smoking Cessation (Critical)

• Cessation of beedi smoking is mandatory - it is contributing to mucosal damage, impaired absorption, and most importantly, is a direct carcinogen for gastric, esophageal, and colorectal cancers.
• Referral to smoking cessation programs; NRT or pharmacotherapy (varenicline/bupropion) as appropriate.

Step 5: Blood Transfusion

• Consider if Hb <7 g/dL, or Hb <8-9 g/dL with symptomatic anemia (angina, dyspnea, hemodynamic compromise).
• This patient (Hb 9.5 g/dL) is unlikely to need transfusion unless symptomatic.

Monitoring Response

Key Clinical Pearl

This patient's IDA is GI malignancy until proven otherwise. Beedi smoking adds meaningful risk for gastric cancer (~2x), esophageal cancer (~6x for bidi smokers), and colorectal cancer. Endoscopic evaluation is urgent and must not be delayed in favor of empirical iron therapy alone.

• Robbins, Cotran & Kumar - Pathologic Basis of Disease, p. 612-617
• Goldman-Cecil Medicine, Chapter 145
• Goodman & Gilman's Pharmacological Basis of Therapeutics, p. 928-930
• Yamada's Textbook of Gastroenterology, 7e
• Swanson's Family Medicine Review
• Sabiston Textbook of Surgery
• Scott-Brown's Otorhinolaryngology Head & Neck Surgery