Management of Steroid-Induced Hyperglycemia in Patients with Type 2 Diabetes

Introduction to Steroid-Induced Hyperglycemia

The American College of Endocrinology recommends starting NPH insulin at 0.3-0.5 units/kg/day given in the morning to match the afternoon peak hyperglycemic effect of glucocorticoids, with dose adjustments proportional to steroid tapering 1, 2
Peak hyperglycemia occurs 6-9 hours after morning steroid administration, typically in the afternoon and evening, with glucose levels often normalizing overnight even without treatment 1, 2

The degree of hyperglycemia directly correlates with the steroid dose—higher doses cause more significant elevations 1, 3
Prednisolone causes hyperglycemia predominantly between midday and midnight, with peak effects approximately 8 hours after morning administration 3

Implement four-times-daily glucose monitoring (fasting and 2 hours after each meal) rather than relying on fasting glucose alone, which will miss the peak hyperglycemic effect 1, 2, 3
Target glucose range: 5-10 mmol/L (90-180 mg/dL) 1, 2, 3
NPH insulin is the preferred agent because its 4-6 hour peak action aligns with the peak hyperglycemic effect of morning glucocorticoid doses 1, 2
Starting dose: 0.3-0.5 units/kg/day given in the morning (or 3 hours after steroid administration) 1, 2, 3

As steroids are tapered, insulin doses must be proportionally decreased to prevent hypoglycemia 1, 2, 3
Adjust insulin based on blood glucose patterns, focusing on afternoon/evening readings 1, 2
Oral agents alone are insufficient for high-dose steroid therapy 1, 4
Continue metformin as an adjunct in patients with preserved renal and hepatic function, with some evidence it alleviates metabolic effects of steroids 1, 3

Hyperosmolar hyperglycemic state can develop in very severe cases 1, 2, 3
Warn patients that capillary blood glucose persistently above 20 mmol/L despite treatment, or glucose meter reading "HI," requires immediate hospital presentation 1, 3
Provide comprehensive education on glucose monitoring technique and frequency, symptoms of severe hyperglycemia and emergency thresholds, and when to seek medical attention 1, 3

Failing to anticipate the diurnal pattern of steroid-induced hyperglycemia, with peak effects in the afternoon and evening 1, 2
Using only fasting glucose to monitor steroid-induced hyperglycemia (will miss the peak hyperglycemic effect) 1, 2
Not reducing insulin doses when steroid doses are tapered, leading to hypoglycemia 1, 2
Relying solely on oral antidiabetic agents for high-dose steroid therapy 1, 4