Clinical Analysis: Mrs. Vijay Mahajan, 75F - Generalized Pruritus for 4 Years

Key Lab Findings (From Reports)

Etiology of Generalized Pruritus - What's Driving It in THIS Patient?

1. Iron Deficiency Anemia (PRIMARY - MOST LIKELY CAUSE)

• Ferritin 9.91 is critically low
• Classic microcytic hypochromic picture (MCV 75, MCH 21, MCHC 28, RDW 19.2)
• Hb 8.0 - moderate-severe anemia
• Iron deficiency is a well-established cause of generalized pruritus that responds to iron replacement
• Action: Oral iron therapy (Ferrous sulfate 200 mg TDS or Ferrous ascorbate 100mg OD; consider IV iron if oral not tolerated given insulin-dependent T2DM with likely GI issues)

2. Eosinophilia (986/cumm, 10%) - Suspect Parasitic Infestation

• This is markedly elevated and is a classic red flag for intestinal parasites as a cause of generalized itching
• In a 75-year-old from Dehradun, Strongyloides, Ascaris, hookworm, and Enterobius are the common suspects
• Per [Andrews' Diseases of the Skin](textbook, p.65): "Presence of eosinophilia on the CBC is a good screen for parasitic diseases... stool samples for ova and parasites should be submitted"
• Action:
  • Stool for ova, cysts and parasites (x3 samples on different days)
  • Serum IgE levels
  • Treat empirically with Albendazole 400 mg single dose (or x 3 days) OR Ivermectin 200 mcg/kg single dose if strongyloidosis suspected - safe in this age group

3. Poorly Controlled T2DM (HbA1c 9.0%)

• Diabetes mellitus is a recognized systemic cause of pruritus via: peripheral neuropathy (neuropathic itch), xerosis (dry skin from autonomic neuropathy), and poor wound healing with secondary skin infections
• The current insulin regimen is clearly insufficient (FBS 156, HbA1c 9.0%)
• Action: Optimize glycemic control - consider titrating basal insulin upward; review dietary compliance; add/replace insulin doses as needed; consult endocrinologist

4. Hypothyroidism

• Hypothyroidism directly causes pruritus through xerosis and altered skin metabolism
• No TSH value is visible in these reports - this must be checked
• Action: Check TSH - ensure she is adequately replaced on her thyroid medication. Under-treated hypothyroidism alone can cause generalized itching and is easily correctable

5. Olmesartan - Drug-Induced Pruritus

• ARBs (olmesartan) can cause pruritus/urticaria as a hypersensitivity reaction, though less commonly than ACE inhibitors
• Olmesartan specifically has been associated with a sprue-like enteropathy and skin reactions
• Action: If above causes are addressed and itching persists, consider switching to a different antihypertensive class (e.g., amlodipine alone since she's already on cilnidipine, or switch ARB to telmisartan/losartan)

6. Borderline CKD (Creatinine 0.982, estimated eGFR ~55-58)

• At 75 years, this creatinine reflects meaningfully reduced GFR (Cockcroft-Gault estimates eGFR ~45-55 mL/min)
• CKD is the most common systemic cause of pruritus - "20-80% of patients with chronic renal failure have itching" (Andrews' Diseases of the Skin, p.65)
• Action: Calculate eGFR formally; check urine ACR; ensure olmesartan dose is appropriate; optimize hydration

Practical Management Plan for Itching

Step 1 - Treat the Underlying Causes First

Step 2 - Symptomatic Antipruritic Treatment

• Topical emollients: Apply liberal amounts of urea 10% cream or coconut oil / white soft paraffin twice daily (xerosis-associated pruritus worsens with diabetic dry skin)
• Antihistamines: In elderly (75 years), prefer non-sedating antihistamines:
  • Cetirizine 5 mg OD (use cautiously - note borderline renal function, reduce dose)
  • Fexofenadine 120 mg OD (safer in elderly and renal impairment)
  • Avoid first-generation (hydroxyzine, chlorphenamine) - anticholinergic side effects, falls risk in 75F
• For neuropathic/diabetic itch: Gabapentin 100-300 mg at bedtime (also helps insomnia - two birds with one stone; titrate carefully with reduced eGFR)
• Topical low-potency steroid short-term (e.g., hydrocortisone 1% cream) if localized excoriations are present

Step 3 - Address Insomnia (Mentioned in the Case)

• In an elderly diabetic, insomnia and pruritus are bidirectionally related - itch worsens at night, sleep deprivation lowers itch threshold
• Gabapentin 100-300 mg at night serves dual purpose (neuropathic itch + sleep)
• Melatonin 2-3 mg at night is a safe first-line option in elderly
• Avoid benzodiazepines in 75F (fall risk)

Additional Investigations to Order

1. TSH (essential - not in current reports)
2. Stool for OCP (x 3 samples)
3. Serum IgE
4. UACR (urine albumin-creatinine ratio - assess diabetic nephropathy)
5. Peripheral blood smear (already elevated eosinophils - rule out haematological malignancy given elevated globulin + reversed A/G ratio + elevated ESR)
6. SPEP (Serum Protein Electrophoresis) - elevated globulin 4.13 with low A/G ratio warrants ruling out multiple myeloma/monoclonal gammopathy in a 75-year-old with generalized symptoms
7. HIV if risk factors (per Andrews' dermatology workup protocol)

Summary Priority List

1. Iron deficiency is almost certainly contributing - treat with IV iron
2. Eosinophilia 10% is a major red flag - deworm empirically and send stool OCP
3. Check TSH urgently - undertreated hypothyroidism is a common, easily missed cause
4. Better glycemic control - HbA1c 9% is unacceptably high and directly contributes to itching
5. Symptomatic relief now - fexofenadine + liberal emollients + gabapentin at night
6. Don't overlook olmesartan as a drug cause if all above addressed without improvement
7. SPEP/globulin workup - the reversed A/G ratio and elevated ESR in a 75F with 4 years of generalized symptoms needs myeloma ruled out

Note: This analysis is based on the available lab reports and clinical details provided. The itching has been present 4 years - a systematic approach addressing all contributing causes simultaneously is more effective than sequential single-cause treatment. Dermatology consultation may be warranted if symptoms persist after addressing the identifiable causes.