A nurse is preparing a 63-year-old client with type 2 diabetes mellitus for a scheduled coronary artery bypass graft (CABG). The client has been NPO since midnight and received their usual long-acting insulin the previous evening. At 6:00 AM, the client reports mild nausea, and their blood glucose level is 180 mg/dL. To ensure optimal perioperative safety, what is the nurse's priority action?

Priority action for diabetic surgical clients with elevated preoperative glucose levels

This question evaluates blood sugar management in diabetic patients before surgery and the nurse's ability to prioritize. A blood glucose of 180 mg/dL is elevated but not high enough to automatically cancel surgery. However, immediate intervention is needed to prevent complications during and after surgery.

The correct answer is to contact the physician for insulin orders and blood glucose monitoring instructions. High blood sugar in surgical patients increases the risk of infection, delayed wound healing, and other complications. The nurse needs specific physician orders for insulin administration and monitoring protocols during the perioperative period.

Diabetic patients undergoing surgery generally require careful management to maintain blood glucose in the range of 80-180 mg/dL (or 100-140 mg/dL at some institutions). The stress response from surgery, anesthesia, and fasting can significantly affect blood sugar levels. Without proper insulin orders, the patient's blood glucose could rise dangerously during surgery.

The nurse should also consider that the patient has been fasting since midnight and received evening insulin, which can lead to unpredictable blood glucose patterns. Proper perioperative diabetes management requires individualized insulin protocols, frequent monitoring, and collaboration with the physician to ensure optimal outcomes and prevent complications such as diabetic ketoacidosis or severe hypoglycemia.

Perioperative Glycemic Management in CABG

The client's blood glucose of 180 mg/dL in the setting of NPO status and mild nausea requires a nuanced response. The priority is not to cancel the surgery or to blindly administer a routine insulin dose, but to communicate the need for a tailored perioperative insulin and monitoring plan.

Why Hyperglycemia Matters Perioperatively
Hospital hyperglycemia, defined as a blood glucose level above 140 mg/dL, is a significant risk factor for adverse surgical outcomes. The physiological stress of surgery triggers a counter-regulatory hormone response (cortisol, catecholamines), promoting hepatic glucose production and insulin resistance. This is compounded by the patient's underlying type 2 diabetes mellitus. The provided consensus guidelines clearly state that hyperglycemia increases the risk of postoperative complications, particularly infections, prolonged hospital stay, and in-hospital mortality ^[1]. Ensuring adequate glycemic control during the perioperative period is therefore essential to reduce these risks and improve surgical outcomes ^[1].

Analyzing the Options
- Option 1 (Administer regular morning insulin): This is unsafe without a current order that accounts for the client's NPO status and nausea. Administering a full subcutaneous insulin dose to a patient who is NPO and nauseated could precipitate dangerous hypoglycemia, a critical safety event.
- Option 2 (Notify surgeon to cancel surgery): A glucose level of 180 mg/dL is a moderate elevation, not a critical value that typically necessitates cancellation of a necessary procedure like CABG. The guidelines focus on management, not cancellation, for this level of hyperglycemia [1,2].
- Option 3 (Continue preparations as acceptable): This is incorrect. A level of 180 mg/dL is above the recommended target range and requires intervention, not passive acceptance. The standard of care dictates active management to mitigate the documented risks of infection and poor wound healing [1,2].
- Option 4 (Contact physician for insulin coverage and monitoring orders): This is the priority action. It directly addresses the hyperglycemia while ensuring patient safety. The physician can provide a tailored order, often for a correctional dose of rapid-acting insulin or an adjustment to an intravenous insulin infusion protocol, along with a specific frequency for blood glucose monitoring. This aligns with the guideline recommendation for ensuring adequate glycemic control through a structured plan [1,2].

The nurse's role is to recognize that the current glucose level, while not an emergency, is outside the safe target range and requires a collaborative, provider-directed intervention to mitigate perioperative risk. The established standards of care emphasize the necessity of a proactive glycemic management strategy in the hospital setting to prevent complications .