Overview
Hyperosmolar coma in type 2 diabetes mellitus is characterized by severe hyperglycemia leading to extreme hyperosmolarity without significant ketoacidosis, often presenting with altered mental status and dehydration 1.Diagnosis
Clinical Presentation: Altered mental status, polydipsia, polyuria, severe hyperglycemia (often >600 mg/dL), and elevated serum osmolality (typically >320 mOsm/kg) 1.
Laboratory Tests: Blood glucose, serum osmolality, electrolytes, renal function tests, and absence of significant ketonuria 1.
Imaging/Special Tests: Not typically required unless underlying causes like hepatic shunts are suspected 1.Management
Fluid Resuscitation: Initial isotonic saline to correct dehydration, followed by hypotonic fluids (e.g., half-normal saline) to gradually reduce osmolality 1.
Insulin Therapy: Subcutaneous or intravenous insulin to lower blood glucose levels gradually, aiming for a reduction of 50-75 mg/dL per hour 1.
Electrolyte Management: Monitor and correct electrolyte imbalances, particularly potassium levels 1.
Address Underlying Causes: Investigate and manage precipitating factors such as infections, non-adherence, or other comorbidities 1.Special Populations
Pediatrics: Not addressed in provided abstracts 1.
Elderly: Increased risk of complications; careful fluid and insulin management is crucial 1.
Comorbidities: Management should consider coexisting conditions like cardiovascular disease, renal impairment, or hepatic shunts (as seen in rare cases) 1.Key Recommendations
Initiate fluid resuscitation with isotonic saline followed by hypotonic fluids to correct dehydration (Evidence: Moderate) 1.
Administer insulin to gradually lower blood glucose levels, avoiding rapid correction to prevent cerebral edema (Evidence: Moderate) 1.
Thoroughly investigate and manage underlying precipitating factors such as infections or non-adherence to diabetes management (Evidence: Expert opinion) 1.References
1 Matsumoto T, Okano R, Sakura N, Kawaguchi Y, Tanaka Y, Ueda K et al.. Hypergalactosaemia in a patient with portal-hepatic venous and hepatic arterio-venous shunts detected by neonatal screening. European journal of pediatrics 1993. link