Perioperative Management of Asthmatic Diabetic Patients

Introduction to Steroid Premedication

The American Diabetes Association recommends that steroid premedication can be given to asthmatic patients with diabetes mellitus undergoing elective surgery, but requires aggressive perioperative glucose management with increased insulin dosing (often 40-60% or more above baseline) and close monitoring to prevent hyperglycemia while avoiding hypoglycemia 1

Patients on chronic steroids (≥4 weeks of use) should receive equivalent intravenous hydrocortisone while unable to take oral medications, using standard conversion ratios: Prednisolone 5 mg = Hydrocortisone 20 mg = Methylprednisolone 4 mg 2, 3
A single preoperative dose of dexamethasone 4 mg IV/IM may be given without increasing steroid dosage to cover perioperative stress, as demonstrated in randomized trials 2

The American Diabetes Association recommends targeting perioperative blood glucose of 100-180 mg/dL (5.6-10.0 mmol/L) within 4 hours of surgery 1, 4
For patients receiving intermediate-acting steroids (like prednisone), administer NPH insulin concomitantly, as NPH peaks 4-6 hours after administration, matching the steroid's hyperglycemic effect 1, 4
For long-acting glucocorticoids (dexamethasone) or continuous steroid use, long-acting basal insulin is required to manage fasting glucose levels 1, 4
Increase prandial and correctional insulin doses by 40-60% or more above baseline when higher-dose glucocorticoids are used 1, 4

The American Diabetes Association recommends targeting A1C <8% (63.9 mmol/L) for elective surgeries whenever possible 1, 4
Monitor blood glucose at least every 2-4 hours while the patient is NPO and dose with short- or rapid-acting insulin as needed 1, 4

If patient is on chronic steroids (>4 weeks) → Continue therapy with IV equivalent dosing perioperatively 2, 3

Hold metformin on day of surgery 1, 4
Hold SGLT2 inhibitors 3-4 days before surgery 1, 4
Give 50% of NPH dose or 75-80% of long-acting insulin analog on morning of surgery 1, 4
Initiate basal-bolus insulin regimen perioperatively (superior to correction-only insulin) 4
Daily adjustments based on glycemia levels and anticipated changes in steroid type, dosage, and duration are critical 1, 4

Point-of-care glucose monitoring every 2-4 hours while NPO, then every 4-6 hours postoperatively 1, 4
Do not use CGM alone for glucose monitoring during surgery 1
Watch for both hyperglycemia (>180 mg/dL) and hypoglycemia (<70 mg/dL), as increasing insulin-to-steroid ratios improves time in range but increases hypoglycemia risk 1, 4

Resume oral steroids when feasible, transitioning from IV hydrocortisone back to oral prednisolone as soon as patient tolerates oral intake 2
Implement standardized taper protocols to avoid inappropriate prolongation of steroids after surgery 2
Monitor for wound healing complications, infections, and signs of adrenal insufficiency in patients who received perioperative corticosteroids 2
Patients on chronic steroids have higher baseline risk for wound complications; careful wound assessment is mandatory 5