Postoperative Management of Overt Diabetes Immediately After Caesarean Section

Immediate Postoperative Monitoring

The American College of Anaesthesiologists recommends checking capillary blood glucose immediately upon arrival to recovery and then every 1-2 hours during the acute postoperative phase, especially critical in insulin-treated patients due to risk of hypoglycemia unawareness 1
Increase monitoring frequency if the patient is on insulin or insulin secretagogues, as postoperative stress and altered oral intake significantly affect glucose levels 1
Continue IV insulin infusion until blood glucose levels are stable at ≤180 mg/dL (10 mmol/L) 2, 3, 4

The American College of Anaesthesiologists recommends transitioning from IV insulin to subcutaneous basal-bolus insulin therapy immediately upon resumption of oral feeding, using approximately 50% of the total 24-hour IV insulin dose as long-acting basal insulin and 50% as rapid-acting prandial insulin, while maintaining continuous glucose monitoring every 1-2 hours to prevent both hyperglycemia and hypoglycemia 2, 3
Calculate total 24-hour IV insulin dose and give 50% as long-acting basal insulin and 50% as ultra-rapid acting analogue divided among meals if IV insulin was used for ≥24 hours 2, 3, 4
Stop IV insulin only when infusion rate is ≤0.5 IU/hour; if rate is ≥5 IU/hour, this indicates major insulin resistance and requires continued IV therapy 2, 3, 4

Administer glucose immediately if blood glucose is <60 mg/dL (3.3 mmol/L), even without clinical symptoms 4, 1
Prefer oral glucose (15-20g) if the patient is conscious and able to swallow 4, 1
Give IV glucose immediately if the patient is unconscious or unable to swallow, then transition to oral glucose when consciousness returns 4, 1

Check for ketosis immediately in any patient with blood glucose >300 mg/dL (16.5 mmol/L) to rule out ketoacidosis 4, 1, 5
Measure serum electrolytes urgently if glucose >300 mg/dL to assess for hyperosmolar hyperglycemic state, which requires ICU-level care 1, 5
Initiate rapid-acting insulin analogue and ensure adequate hydration with 0.9% normal saline 4, 1, 5

Use 0.9% normal saline as the primary IV fluid, especially given NPO status and surgical fluid losses typical after caesarean section 1, 5
Ensure adequate hydration to prevent dehydration-related hyperglycemia and to support lactation 1, 5

Reconnect the personal insulin pump as soon as the patient can manage it autonomously 3, 4
If the patient cannot manage the pump independently, initiate a basal-bolus subcutaneous insulin regimen immediately 3, 4

Never abruptly stop IV insulin without overlapping subcutaneous basal insulin, as this causes dangerous rebound hyperglycemia and potential ketoacidosis 1, 5
Do not ignore altered mental status—check blood glucose immediately and consider hyperosmolar state, particularly in Type 2 diabetes 1, 5
Avoid using sliding-scale insulin alone without basal insulin coverage, as basal-bolus regimens significantly improve glycemic control and decrease postoperative complications compared to intermittent rapid insulin injections 2

Continue frequent glucose monitoring throughout the postoperative hospitalization to detect both hyperglycemia and hypoglycemia 2, 3, 4
Adjust insulin doses based on blood glucose patterns over 24-48 hours 1
Maintain glucose targets of 140-180 mg/dL in the postoperative period, as this range balances infection risk reduction without excessive hypoglycemia 5

The recommended intravenous dextrose concentrations for acute hypoglycemia treatment are 10 %, 25 %, and 50 % solutions. [6][7]

In an unconscious adult whose capillary glucose is ≤4 mmol/L (≤70 mg/dL), give an initial IV bolus of 10–15 g dextrose over 1–3 minutes, using either 100–150 mL of 10 % dextrose or 20–30 mL of 50 % dextrose; re‑measure glucose at 5–10 minutes and repeat 5–10 g aliquots as needed until consciousness is restored. [6][7]

Once the patient regains consciousness and can safely swallow, provide 15–20 g of oral glucose (e.g., glucose tablets, 6–8 oz of juice, or 1 tablespoon of honey). [6][7]

Activate emergency medical services if the patient experiences a seizure, shows no improvement within 10 minutes of IV dextrose, or has recurrent hypoglycemia. [6][7]

Oral glucose must never be administered to an unconscious patient because of the risk of aspiration. [6][7]
IV dextrose should be given without delay; untreated hypoglycemia can lead to seizures, permanent brain injury, or death. [6][7]