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Mr A S Byarareddy A 72 year old Male patient admitted to MGW C/o sweating, Dryness of mouth, tiredness recurrently at night for 5 to 6 days , pain abdomen, Generalized weakness, pain in the right leg , reduced oral intake , constipation for 2 days K/C/O DM HTN for 5 years O/E BP - 100/70 mmhg, 96bpm , 98% GRBS - 115 mg/dl Sodium - 128 Potassium - 5.4 Total count - 18000 Creatinine - 2.28 Patient got admitted on 26/6/26 and got discharged on 6/7/26 for Right lower limb spreading cellulitis with necrotizing fasciitis with sepsis with hyponatremia Recurrent Hypoglycemia with Hyponatremia , K/C/O DM HTN Interpretation of this case and differential diagnosis and final diagnosis and treatment
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Case Analysis: Mr. A S Byarareddy, 72M
ABG / i-SmartCare Report (13/07/2026, 01:39 - Venous sample)
| Parameter | Value | Status |
|---|---|---|
| pH | 7.403 | Normal |
| pCO2 | 27.6 mmHg | LOW (compensatory) |
| pO2 | 42 mmHg | LOW (venous sample - expected) |
| HCO3- | 17.2 mmol/L | LOW |
| BE(B) | -6.3 mmol/L | LOW |
| Na+ | 119 mmol/L | Severely LOW |
| K+ | 4.9 mmol/L | High-normal |
| Ca2+ | 0.99 mmol/L | LOW |
| Cl- | 87 mmol/L | LOW |
| Lactate | 16 mg/dL (~1.8 mmol/L) | Elevated |
| Anion Gap | 20 mmol/L | HIGH |
| tHb | 11.2 g/dL | LOW (mild anaemia) |
| Glu | 96 mg/dL | Normal |
Note: This is a venous blood gas. The pO2 and sO2 (79%) reflect venous values and do NOT indicate severe arterial hypoxia by themselves, though clinical correlation is needed.
ABG Interpretation: Mixed Acid-Base Disorder
Step-by-step analysis:
- pH 7.403 - borderline normal/mildly alkalemic
- HCO3- 17.2 - metabolic acidosis is present
- pCO2 27.6 - LOW: respiratory compensation is occurring
- Expected pCO2 for metabolic acidosis = 1.5 × HCO3 + 8 (±2) = 1.5 × 17.2 + 8 = 33.8 ±2 mmHg
- Measured pCO2 (27.6) is LOWER than expected (33.8) → Superimposed primary respiratory alkalosis
- Anion Gap = Na - (Cl + HCO3) = 119 - (87 + 17.2) = 14.8 (by report shows 20 using different Na; report's anion gap of 20 is elevated)
- High anion gap metabolic acidosis (HAGMA)
- Delta-delta ratio: Elevated AG with relatively higher-than-expected HCO3 suggests a concurrent metabolic alkalosis component or pre-existing alkalosis
Conclusion: Triple acid-base disorder - HAGMA + respiratory alkalosis + possible metabolic alkalosis (from vomiting/poor intake), partially compensated, with a near-normal pH masking the underlying severity.
Cause of HAGMA: Lactic acidosis from sepsis (NF + cellulitis) + possible uremic component (Creatinine 2.28 at admission, likely worsened post-discharge)
Case Interpretation
Presentation Summary
- 72-year-old male, DM + HTN (5 years)
- Presenting symptoms: nocturnal sweating, dry mouth, fatigue, abdominal pain, generalized weakness, right leg pain, reduced oral intake, constipation
- BP 100/70 (hypotension for his HTN baseline), HR 96, SpO2 98%
- GRBS 115 (near-normal - but recurrent hypoglycemia noted)
- Admission Na+ 128 → post-discharge Na+ 119 (worsening!)
- TLC 18,000 (leukocytosis, infection)
- Creatinine 2.28 (AKI or CKD)
Key Pathophysiology Connections
1. Right lower limb spreading cellulitis + Necrotizing Fasciitis
The index diagnosis driving everything. Risk factors present: DM + HTN. NF in diabetics is classically:
- Polymicrobial (Type I NF): synergistic aerobic-anaerobic infection
- Organisms: Group A Streptococcus, Staph aureus, Enterobacteriaceae, Bacteroides, Peptostreptococcus
- Drives systemic sepsis → lactic acidosis → multi-organ dysfunction
2. Sepsis (from NF)
- TLC 18,000 + hypotension (BP 100/70 in a hypertensive patient = relative hypotension) + tachycardia (96 bpm) + source of infection
- Drives: lactic acidosis (Lactate 16 mg/dL), AKI (Cr 2.28), hyponatremia
3. Hyponatremia (Na 128 at admission → 119 post-discharge)
This is severe, likely euvolemic/hypovolemic hyponatremia, multi-factorial:
- SIADH from sepsis/pain/stress (most prominent)
- Reduced oral intake (sodium/water deficit)
- Diuretic use (antihypertensive treatment)
- Adrenal insufficiency must be excluded (given recurrent hypoglycemia + hyponatremia in an elderly diabetic - classic ADRENAL AXIS failure)
- Hypothyroidism (less likely but must exclude in elderly)
4. Recurrent Hypoglycemia (the critical clue)
Recurrent nocturnal hypoglycemia in a diabetic on treatment, COMBINED with hyponatremia + hyperkalemia (K+ 5.4 at admission) + weakness → must exclude Adrenal Insufficiency (Primary - Addison's disease or secondary)
- Sepsis can unmask subclinical adrenal insufficiency
- Electrolyte triad of Addisonian crisis: low Na, high K, hypoglycemia - perfectly matching this patient
Differential Diagnosis
Primary Differential
| Diagnosis | Supporting Evidence |
|---|---|
| Right lower limb NF + Sepsis (Final Dx) | Spreading cellulitis, DM, HTN, leukocytosis, lactic acidosis, hypotension |
| Adrenal Insufficiency (AI) / Crisis | Recurrent hypoglycemia + hyponatremia + hyperkalemia + weakness + hypotension + DM (risk for AI) |
| SIADH (secondary to sepsis/NF) | Euvolemic/hypovolemic hyponatremia in septic patient |
| AKI on CKD | Creatinine 2.28, contributing to HAGMA, hyperkalemia, hyponatremia |
| Diabetic autonomic neuropathy | Nocturnal sweating, dry mouth, orthostatic hypotension |
Secondary/Contributing
- Hypovolemia (poor oral intake, constipation, diaphoresis) → worsening hyponatremia and hypotension
- Anaemia (Hb 11.2 g/dL) - likely chronic disease + blood loss from NF/surgery
- Hypocalcemia (iCa 0.99) - sepsis-associated, contributes to weakness
- Type 2 Respiratory Alkalosis - sepsis-driven hyperventilation
Final Diagnoses (Discharge Diagnosis Confirmed)
- Right lower limb spreading cellulitis with Necrotizing Fasciitis (Type I, polymicrobial)
- Sepsis (from NF)
- Severe Hyponatremia (Na 128 → 119) - SIADH + hypovolemic component
- Recurrent Hypoglycemia - likely compounded by reduced oral intake + anti-diabetic medications; adrenal insufficiency must be excluded
- AKI (Creatinine 2.28) - sepsis-induced
- High Anion Gap Metabolic Acidosis with respiratory alkalosis (triple acid-base disorder)
- Hypocalcemia - sepsis-associated
- Mild normocytic anaemia
Treatment Approach
1. Necrotizing Fasciitis + Cellulitis
- Emergency surgical debridement - the cornerstone of treatment; delays increase mortality significantly
- Wide excision of all necrotic tissue; repeat debridement at 24-48 hours if needed
- Wound irrigation, vacuum-assisted closure (VAC) post-debridement
- Broad-spectrum IV antibiotics (triple therapy as per Tintinalli's Emergency Medicine):
- Piperacillin-tazobactam (4.5g IV q6h) OR Meropenem/Imipenem for Gram-negatives + anaerobes
- Vancomycin (15-20 mg/kg IV q8-12h) for MRSA coverage
- Clindamycin (600-900 mg IV q8h) to suppress streptococcal toxin production
- Duration: continue until wound culture-directed, usually 2-3 weeks
- Tetanus prophylaxis if not up to date
2. Sepsis Resuscitation (Surviving Sepsis Bundles)
- IV fluid resuscitation: Balanced crystalloids (Ringer's Lactate preferred over NS in hyponatremia; however, 0.9% NS 30 mL/kg initial bolus per sepsis protocol)
- Monitor lactate: target < 2 mmol/L
- Blood cultures × 2 before antibiotics
- Vasopressors (Norepinephrine) if MAP < 65 mmHg despite fluid resuscitation
- ICU-level monitoring
3. Hyponatremia Correction
- Na+ 119 mmol/L = severe hyponatremia (post-discharge reading)
- If symptomatic (seizures, altered sensorium): 3% NaCl 100-150 mL IV over 10-20 min - can repeat ×2 targeting Na rise of 4-6 mEq/L acutely
- Rate of correction: maximum 8-10 mEq/L per 24 hours (12 mEq/L maximum) to avoid osmotic demyelination syndrome (ODS/CPM)
- Fluid restrict if SIADH confirmed
- Treat underlying cause (sepsis, adrenal insufficiency)
4. Rule Out / Treat Adrenal Insufficiency
- 8 AM serum cortisol + ACTH stimulation test
- If high suspicion of Addisonian crisis (hypotension + hyponatremia + hyperkalemia + hypoglycemia): Empirical Hydrocortisone 100 mg IV bolus then 50 mg IV q8h
- Do NOT wait for cortisol results in hemodynamically unstable patient
5. Hypoglycemia Management
- Identify and reduce/withhold hypoglycemic agents (especially sulfonylureas, insulin)
- D50W IV for acute episodes; 10% Dextrose infusion for maintenance
- Recheck GRBS q2-4h
- Nutrition support: NGT feeding if oral intake remains poor
6. AKI Management
- Monitor urine output (target ≥ 0.5 mL/kg/hr)
- Avoid nephrotoxic drugs (NSAIDs, aminoglycosides - caution in dosing)
- Correct hypovolemia
- If creatinine continues to rise or oliguric AKI: Nephrology consult for possible RRT
7. Electrolyte Correction
- Hypocalcemia (iCa 0.99): IV Calcium gluconate 1g in 100 mL NS over 10 min
- Potassium 5.4: monitor closely given AKI; avoid K+ supplementation; if rises > 6.0 → calcium gluconate + insulin-dextrose + Kayexalate
- Acidosis: treat underlying sepsis and lactate; bicarbonate only if pH < 7.1
8. Supportive
- DVT prophylaxis (LMWH) once surgical wounds stable
- Diabetic foot care / vascular surgery opinion if peripheral vascular disease suspected
- Nutritional supplementation
- PPI for stress ulcer prophylaxis
- Physical therapy post-stabilization
Important Monitoring Parameters
| Parameter | Target | Frequency |
|---|---|---|
| GRBS | 140-180 mg/dL (ICU) | q1-2h |
| Serum Na | Correct by max 8-10 mEq/L/day | q4-6h initially |
| Serum K | 3.5-5.0 | q4-6h |
| Creatinine / UO | Improving trend / ≥0.5 mL/kg/hr | Daily |
| Lactate | < 2 mmol/L | q6h |
| Wound assessment | Re-debridement readiness | 24-48h |
| BP / MAP | MAP ≥ 65 mmHg | Continuous |
Summary
This is a complex, high-risk elderly diabetic patient with a life-threatening polymicrobial necrotizing soft tissue infection driving systemic sepsis, which has in turn precipitated severe hyponatremia, lactic acidosis (HAGMA), AKI, and hypocalcemia. The recurrent hypoglycemia combined with hyponatremia and borderline hyperkalemia raises the important additional concern of adrenal insufficiency, which should be actively investigated and empirically treated if suspected. The near-normal pH on ABG is deceptive - it masks a serious underlying triple acid-base disorder. Management pivots on urgent surgical debridement + triple antibiotic therapy + sepsis resuscitation + controlled sodium correction, with close attention to adrenal axis evaluation.
Sources: Tintinalli's Emergency Medicine, 10th Ed. - Necrotizing Fasciitis section; Rosen's Emergency Medicine - Metabolic Acidosis, Anion Gap; Comprehensive Clinical Nephrology, 7th Ed. - Hyponatremia management; Current Surgical Therapy 14e - Sepsis bundles.
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