What are the clinical manifestations and etiologies of diabetic ketoacidosis?

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Diabetic Ketoacidosis: Symptoms and Causes

Diabetic ketoacidosis presents with polyuria, polydipsia, nausea, vomiting, abdominal pain, dehydration, weakness, and altered mental status, typically evolving within 24 hours, and is most commonly triggered by infection or insulin deficiency. 1

Clinical Manifestations

Classic Symptom Triad

The hallmark symptoms of DKA include:

  • Polyuria (excessive urination)
  • Polydipsia (excessive thirst)
  • Polyphagia (excessive hunger)

These are accompanied by weight loss and typically evolve rapidly, usually within 24 hours 1.

Gastrointestinal Symptoms

Nausea and vomiting occur in up to 57-77% of patients and represent the most common presenting complaint 2. Abdominal pain is present in approximately 42% of cases and is specific to DKA (not seen in hyperosmolar hyperglycemic state) 1. Up to 25% of patients may have coffee-ground emesis that is guaiac positive, related to hemorrhagic gastritis 1.

Physical Examination Findings

Key physical findings include:

  • Kussmaul respirations (deep, labored breathing pattern) - pathognomonic for DKA but present in limited patients 1, 2
  • Poor skin turgor indicating dehydration 1
  • Tachycardia and hypotension from volume depletion 1
  • Altered mental status ranging from full alertness to profound lethargy or coma 1
  • Dehydration (42% of cases) 2

Important Clinical Caveat

Patients may be normothermic or even hypothermic despite infection being present, due to peripheral vasodilation. Hypothermia is a poor prognostic sign associated with increased mortality 1.

Causes and Precipitating Factors

Most Common Trigger: Infection

Infection is the single most common precipitating factor for DKA, occurring in approximately 69% of cases 1, 2. The most frequent infections are:

  • Pneumonia (38.7% of infection-related DKA) 2
  • Urinary tract infections (30.6% of infection-related DKA) 2

Insulin-Related Causes

  • New-onset type 1 diabetes (14% of DKA cases) 3
  • Discontinuation or inadequate insulin in established type 1 diabetes (56% of cases show suboptimal adherence) 3
  • Non-compliance to treatment (53.5% of cases) 2

A critical finding from recent data shows that 71% of patients with pre-existing type 1 diabetes experience recurrent episodes of DKA, indicating significant educational deficits 3. Notably, only 21% of type 1 diabetes patients possess ketone tests and only 6% actually use them 3.

Other Precipitating Factors

  • Cerebrovascular accident (stroke) 1
  • Myocardial infarction 1
  • Pancreatitis 1
  • Trauma 1
  • Alcohol abuse 1

Medication-Induced DKA

Drugs that affect carbohydrate metabolism can precipitate DKA, including:

  • Corticosteroids 1
  • Thiazide diuretics 1
  • Sympathomimetic agents (dobutamine, terbutaline) 1
  • SGLT-2 inhibitors - these modestly increase DKA risk and can cause euglycemic DKA 4

A concerning finding is that 100% of patients on SGLT-2 inhibitors who developed DKA were not educated about sick-day rules 3.

Pathophysiology

The fundamental mechanism is insulin deficiency combined with elevated counterregulatory hormones (glucagon, catecholamines, cortisol, growth hormone) 1. This hormonal imbalance leads to:

  1. Increased hepatic and renal glucose production → hyperglycemia
  2. Lipolysis (fat breakdown) → release of free fatty acids
  3. Unrestrained hepatic fatty acid oxidation → ketone body production (β-hydroxybutyrate and acetoacetate)
  4. Ketonemia and metabolic acidosis from accumulation of ketoacids
  5. Osmotic diuresis from glycosuria → loss of water, sodium, potassium, and other electrolytes

Mortality and Prognosis

The mortality rate for DKA is 5% in experienced centers 1. Prognosis is substantially worsened by:

  • Extremes of age (very young or elderly)
  • Presence of coma
  • Hypotension
  • Pre-existing type 2 diabetes with severe comorbidities (mortality risk 2.3%, restricted to multimorbid T2DM patients) 3

Critical Clinical Pitfall

Do not rely solely on pH to diagnose DKA. A recent case demonstrated that profuse vomiting can cause metabolic alkalosis that masks the expected acidosis, resulting in an alkalotic pH despite meeting all other DKA criteria 5. Always evaluate the complete clinical picture including anion gap, ketone levels, and glucose in context with symptoms.

References

1
Guideline

hyperglycemic crises in diabetes.

Diabetes Care, 2004

4
Research

Diabetic Ketoacidosis: Evaluation and Treatment.

American family physician, 2024

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