Management of Patients on Intravenous Insulin Infusion

Introduction to IV Insulin Management

The American College of Physicians recommends administering subcutaneous basal insulin 1-2 hours before discontinuing the IV infusion, using 60-80% of the total 24-hour IV insulin dose as the starting subcutaneous basal dose, for patients transitioning off IV insulin 1, 2

The American Diabetes Association suggests maintaining blood glucose between 140-180 mg/dL for critical care patients, and considering tighter targets of 110-140 mg/dL for select populations, such as those undergoing cardiac surgery or experiencing acute ischemic cardiac/neurologic events 1, 2, 3
The Endocrine Society recommends using validated written or computerized protocols that allow predefined adjustments based on glycemic fluctuations and insulin dose 1, 2

The American Association of Clinical Endocrinologists advises calculating the total daily dose of IV insulin administered over the last 24 hours when glucose was stable, and using 50-80% of this dose as the starting subcutaneous basal dose, with 60-80% being the most common conversion factor 1, 2, 4
The Society of Hospital Medicine recommends administering subcutaneous long-acting basal insulin 2 hours before stopping IV insulin, and maintaining IV insulin infusion for 1-2 hours after subcutaneous basal insulin administration to prevent rebound hyperglycemia and ketoacidosis 4

The American College of Physicians suggests using a basal-bolus regimen for patients with good oral intake, and a basal-plus-correction regimen for patients with poor oral intake or NPO 1, 2
The Endocrine Society recommends starting insulin-naive patients at 0.5-1 units/kg/day when blood glucose remains >180 mg/dL after resuming oral intake, and dividing this dose as 50% basal and 50% prandial 5

The American Diabetes Association recommends implementing standardized hospital-wide nurse-initiated hypoglycemia treatment protocols, and treating hypoglycemia with 15-20 grams IV dextrose for glucose <60 mg/dL or 60-70 mg/dL with symptoms 1, 2, 6

The Society of Hospital Medicine suggests checking capillary blood glucose before each meal and at bedtime, and adjusting insulin doses daily based on glucose patterns 4

The American College of Physicians recommends cross-checking home and hospital medications to ensure no chronic medications are stopped, and providing clear communication with outpatient providers via discharge summaries 7, 8
The American Association of Clinical Endocrinologists advises scheduling outpatient follow-up within 1 month of discharge for all patients with hyperglycemia, and requesting endocrinology consultation before discharge for HbA1c >9% or unstable glucose levels >200 mg/dL 1, 7, 8

The American Diabetes Association recommends restarting an intravenous insulin infusion when blood glucose exceeds 180 mg/dL on two separate measurements within 24 hours in a patient who has been transitioned off the drip, or immediately if blood glucose rises above 300 mg/dL with signs of metabolic decompensation 9
Restart the drip when glucose persistently exceeds 180 mg/dL confirmed on two occasions within 24 hours in critically ill patients 9
The American Diabetes Association suggests that subcutaneous basal insulin was not given 2-4 hours before stopping IV insulin is a common scenario requiring restart 10

Uncontrolled stress hyperglycemia during or after surgery exceeding 180 mg/dL despite subcutaneous insulin requires restarting the drip, particularly common after cardiac surgery, major abdominal procedures, or with catecholamine infusions 11
When a patient who was transitioned to subcutaneous insulin becomes NPO again and glucose rises above 180 mg/dL, restarting the drip is necessary 12, 13
New onset sepsis, shock, or multi-organ dysfunction with glucose >180 mg/dL requires restarting the drip 10
Severe hyperglycemia >300 mg/dL with clinical instability, such as sepsis, shock, or acute organ failure, necessitates immediate restart of the drip 14

The American Diabetes Association recommends checking current glucose and recent trend, and considering immediate restart if single glucose >300 mg/dL 14
Two consecutive readings >180 mg/dL within 24 hours indicate restart is necessary 9
Critically ill patients with glucose >180 mg/dL should have the drip restarted 12, 9

Administering subcutaneous basal insulin 2-4 hours before stopping the drip can prevent the need to restart 10

Checking glucose every 1-2 hours initially until stable in target range is necessary after restarting the drip 12, 13
Using validated computerized or written protocols for insulin titration is recommended 9

Waiting too long to restart the drip, as persistent glucose >200 mg/dL for >12 hours increases complication risk 9
Failing to address the underlying cause, such as sepsis, steroid administration, or inadequate transition planning, can lead to ineffective management 10, 11
Using sliding scale insulin alone instead of restarting the drip in critically ill patients is strongly discouraged and ineffective 12, 13