Osler Round 1 - 60/M with persistent DIB: Case Discussion

This case highlights the critical clinical challenge of managing Diabetic Ketoacidosis (DKA) in a patient with concurrent hypertensive urgency and clinical signs of fluid overload in a rural, resource-constrained setting. Learners will develop skills in atypical DKA presentations, cautious fluid resuscitation, and safe transition to long-term glycemic and blood pressure control.

Diabetic Ketoacidosis (DKA) is driven by insulin deficiency and an increase in counter-regulatory hormones, leading to accelerated lipolysis, ketone body production, and metabolic acidosis. This acidosis triggers compensatory Kussmaul breathing, presenting as dyspnea. Epigastric pain in DKA is mediated by delayed gastric emptying and metabolic acidosis. In this patient, chronic untreated hypertension has likely led to hypertensive heart disease. While DKA typically causes profound dehydration, the patient's underlying cardiac dysfunction makes him highly vulnerable to pulmonary congestion, as evidenced by bilateral basal crackles. Standard aggressive fluid resuscitation in this state can rapidly precipitate overt, life-threatening pulmonary edema.

Key positive findings include a random blood glucose of 25 mmol/L, positive urine ketones, severe hypertension (180/100 mmHg), tachypnea (24 breaths/min), hypoxia (SpO2 92% on room air), bilateral basal crackles, epigastric tenderness, and leukocytosis (WBC 12,500 cells/μL). Key negative findings include a clear chest radiograph, which helps rule out primary pneumonia or severe consolidative disease. Red flags include hypoxia on room air and signs of fluid overload in the setting of severe hyperglycemia. Critical missing safety data include serum potassium levels, renal function (creatinine/urea), and a formal Glasgow Coma Scale (GCS) assessment.

Initial bedside assessment must include a rapid GCS score to determine the level of care, hourly vital signs, and a urine dipstick. Laboratory investigations must prioritize a complete blood count (CBC) to evaluate the leukocytosis, serum electrolytes (especially potassium), and renal function tests [R1]. A chest radiograph is essential to rule out pulmonary pathology and assess cardiomegaly.

To manage DKA in the presence of fluid overload, avoid standard aggressive fluid resuscitation. Initiate cautious weight-based fluid resuscitation at 10 mL/kg/hour (a 50% reduction from standard protocols) and insert a urinary catheter for strict hourly input/output monitoring. Administer IV Furosemide at 1 mg/kg/day to alleviate pulmonary congestion [R1, R2]. Target a gradual reduction of blood glucose to 14 mmol/L; do not administer insulin immediately, as initial fluids will lower glucose via dilution. If hyperglycemia persists after 2 to 4 hours of fluid stabilization, initiate rapid-acting insulin at 0.1 units/kg/hour. Monitor potassium every 24 hours and replace as follows: add 40 mmol/L to fluids if potassium is <3.5 mmol/L, add 20 mmol/L if between 3.5 and 5.5 mmol/L, and withhold if >5.5 mmol/L. Lower blood pressure gradually to a short-term target of 160/100 mmHg using oral Captopril (12.5 mg) or Amlodipine (10 mg) [R1, R5]. Administer broad-spectrum cephalosporins to treat suspected underlying sepsis [R1, R2].

- DKA presenting with fluid overload requires a 50% reduction in standard fluid resuscitation rates (10 mL/kg/h) and concurrent loop diuretic therapy.
- Epigastric tenderness and dyspnea are classic systemic manifestations of DKA-associated metabolic acidosis and should not be misattributed solely to primary abdominal or respiratory disease.
- Never initiate insulin in DKA management without first starting fluid resuscitation and ensuring the serum potassium is above 3.3 mmol/L.
- Gradual blood pressure reduction using oral agents like Captopril or Amlodipine is safer than aggressive IV antihypertensives in resource-limited settings.
- Traditional herbal therapies frequently delay essential medical care and can cause direct renal and hepatic toxicity.