A nurse is caring for a 58-year-old client with type 2 diabetes mellitus who is scheduled for TURP in the morning. The client's preoperative blood glucose is 180 mg/dL, and the surgeon has ordered to hold all oral antidiabetic medications. What is the nurse's priority action?

Perioperative diabetes management requires insulin coverage when oral medications are held and blood glucose is elevated.

In the perioperative management of diabetic patients, blood glucose control is very important to prevent complications such as delayed wound healing, increased infection risk, and metabolic disturbances. When oral diabetes medications are held before surgery (standard practice to prevent hypoglycemia in the fasting state), alternative blood glucose management is essential.

The patient's blood glucose of 180 mg/dL exceeds the perioperative target range of 140-180 mg/dL, and many institutions aim for tighter control of 100-140 mg/dL. This hyperglycemia, along with the surgical stress response, can further elevate blood glucose and increase surgical complications.

The reason contacting the medical team to obtain an insulin prescription is the priority is that insulin is the most effective and safe method to manage hyperglycemia in the perioperative period. When oral medications cannot be administered, sliding scale insulin or continuous insulin infusion protocols are commonly used for blood glucose control.

The surgical stress response, including the release of counter-regulatory hormones such as cortisol and epinephrine, is likely to further elevate blood glucose. Without adequate insulin coverage, the patient is at risk of developing severe hyperglycemia, diabetic ketoacidosis, or hyperosmolar hyperglycemic state, all of which significantly increase surgical morbidity and mortality.

Appropriate perioperative blood glucose management reduces infection rates, promotes wound healing, and shortens hospital stay, making insulin coverage the most important intervention for this patient's safety.

Understanding the Clinical Scenario

This question presents a classic perioperative challenge in a client with type 2 diabetes. The client is scheduled for a transurethral resection of the prostate (TURP), has been NPO since midnight, and has a preoperative blood glucose of 180 mg/dL. The surgeon's order to hold all oral antidiabetic medications is appropriate, but the elevated glucose in the context of NPO status and surgical stress requires a proactive metabolic management strategy. The client's anxiety about managing diabetes without medications is a valid psychosocial concern, but the physiological risk of unmanaged hyperglycemia takes priority.

Analyzing the Options

1. Administer the client's usual morning dose of metformin with a small sip of water: This is incorrect and potentially dangerous. Metformin is held preoperatively primarily due to the risk of lactic acidosis in the setting of potential renal hypoperfusion from NPO status, contrast dye, or intraoperative events. Giving it with a sip of water violates the NPO order and does not address the immediate hyperglycemia.
2. Document the elevated glucose level and notify the surgeon immediately: While documentation and notification are important, this is a passive action. A blood glucose of 180 mg/dL is an expected finding in a preoperative diabetic patient whose medications are held. The priority is not merely to report it but to anticipate the need for a new management order. The surgeon is already aware of the diabetes and the NPO status.
3. Contact the healthcare provider to obtain orders for insulin coverage: This is the correct priority action. The foundational principle from the provided guideline is that adequate perioperative glycemic control reduces postoperative complications. Holding oral agents without a bridge to intravenous or subcutaneous insulin leaves the client without glucose management during a catabolic stress state. The nurse must advocate for a corrective insulin order to manage the current hyperglycemia and maintain euglycemia throughout the perioperative period.
4. Reassure the client that blood glucose will normalize after surgery: This provides false reassurance. Surgical stress triggers the release of counter-regulatory hormones like cortisol and catecholamines, which promote gluconeogenesis and insulin resistance, typically worsening hyperglycemia, not resolving it. This action neglects a critical physiological risk.

Deep Dive into the Pathophysiology and Rationale

The core of this question lies in understanding the metabolic response to surgery and the rationale for perioperative glycemic control. The joint position statement emphasizes that hospital hyperglycemia, regardless of a prior diabetes diagnosis, increases the risk of postoperative complications, particularly infections, prolonged hospital stay, and in-hospital mortality ^[1].

When a client with type 2 diabetes is made NPO and their oral agents are held, the endogenous glucose production by the liver is unopposed. Simultaneously, the surgical procedure itself acts as a potent stressor, activating the sympathetic nervous system and hypothalamic-pituitary-adrenal axis. This leads to a surge in hormones like cortisol and epinephrine, which directly antagonize insulin action and promote hepatic glucose output. The result is a predictable rise in blood glucose, as seen with the client's level of 180 mg/dL ^[1].

The nurse's priority action is rooted in the guideline's core message: ensuring adequate glycemic control during the perioperative period helps reduce these risks and improve surgical outcomes ^[1]. This is not achieved by holding all medications and waiting. It requires a proactive transition to a basal-bolus or correctional insulin regimen. By contacting the provider for insulin coverage orders, the nurse is directly applying the evidence that active management of hyperglycemia with insulin is essential to mitigate the risk of poor wound healing and surgical site infections. The nurse's role is to recognize that the current order set is incomplete for the client's metabolic needs and to advocate for a comprehensive plan that bridges the NPO period safely.