Hyperglycemic Emergencies: Diagnosis and Management

Clinical Presentation and Diagnosis

The American Diabetes Association recommends that blood glucose levels ≥ 250 mg/dL (13.9 mmol/L) with symptoms of hyperglycemic crisis, or ≥ 500 mg/dL (27.8 mmol/L) regardless of symptoms, constitute emergent hyperglycemia requiring immediate medical attention 1
Diabetic Ketoacidosis (DKA) develops over hours to days, usually in patients with type 1 diabetes or absolute insulin deficiency, and is characterized by blood glucose typically >250 mg/dL (13.9 mmol/L), ketosis, and metabolic acidosis 2
Hyperglycemic Hyperosmolar State (HHS) is characterized by profound hyperglycemia and hyperosmolarity, and often presents with concurrent acute illness and change in cognitive state 2
Random plasma glucose ≥200 mg/dL (11.1 mmol/L) with classic symptoms of hyperglycemia or hyperglycemic crisis is a diagnostic criterion for emergent hyperglycemia 3
Blood glucose >250 mg/dL (13.9 mmol/L) with ketones present indicates potential DKA 2
Presence of ketones in blood (>2 mmol/L) or urine with hyperglycemia suggests DKA 4

Type 1 diabetes/absolute insulin deficiency is a risk factor for hyperglycemic crises 2
Regular blood glucose monitoring, especially during illness, can help prevent hyperglycemic emergencies 2
Measurement of urine or blood ketones when glucose levels exceed 200 mg/dL (11.1 mmol/L) during illness or with missed insulin doses can help identify potential DKA 2
Education about proper insulin administration and recognition of hyperglycemic symptoms is crucial for preventing hyperglycemic emergencies 1

Immediate vital signs monitoring, including blood pressure, heart rate, respiratory rate, temperature, and oxygen saturation, is essential in the emergency management of hyperglycemic emergencies 1
Laboratory evaluation, including complete blood count, comprehensive metabolic panel, serum ketones, arterial blood gas, and urinalysis, should be performed in patients with hyperglycemic emergencies 1
Begin immediate IV fluid resuscitation with isotonic saline to address dehydration and hypotension 1
Add dextrose to IV fluids when blood glucose falls below 200-250 mg/dL (11.1-13.9 mmol/L) while continuing insulin to clear ketones 1
Do not delay fluid resuscitation in a hypotensive patient with hyperglycemia, and do not underestimate the severity of the condition even if the patient appears clinically stable 1
Do not forget to monitor and replace electrolytes, particularly potassium, during treatment 1