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perioperative metformin management day surgery guideline oral hypoglycaemic agents

Question 42: Perioperative management of metformin for day-case arthroscopy

Best answer in this question: (b)
Continue oral hypoglycaemic agents until and including the day of surgery.

Why?

This is a short, minor day-case procedure in a person with type 2 diabetes treated only with metformin 850 mg/day.
  • Metformin alone does not usually cause hypoglycaemia, even if the patient has fasted.
  • A short arthroscopy generally causes little physiological stress and the patient is expected to eat again soon after surgery.
  • Therefore, there is usually no need for an insulin-dextrose infusion or for starting insulin merely because surgery is planned.

Why the other options are wrong

  • (a) IV dextrose + insulin + potassium:
    This is for patients needing tight glucose control during major surgery, prolonged fasting, poorly controlled diabetes, or those already using insulin. It is excessive for this uncomplicated day case.
  • (c) Stop on the morning of surgery and restart with the first meal:
    This is a common policy in some hospitals, but the question’s intended answer is continuation for a minor procedure. Guidance has differed between institutions.
  • (d) Start 50 units of insulin if glucose is <10 mmol/L:
    Incorrect and unsafe. A glucose below 10 mmol/L is not an indication for 50 units of insulin. Insulin is titrated carefully when required.
  • (e) Management depends on HbA1c:
    HbA1c matters for assessing overall diabetic control and elective-surgery risk, but it does not by itself determine the immediate medication plan described here.

Important modern practice point

Current recommendations are not completely uniform. Some anesthesia and surgical protocols advise withholding metformin on the morning of surgery, particularly if there is renal impairment, risk of dehydration or hypotension, major surgery, or iodinated contrast exposure. Other modern perioperative guidance permits continuation for minor procedures in patients with stable renal function. The actual instruction should therefore follow the local anesthesia/diabetes protocol.
The traditional textbook position is that metformin and other oral agents are often withheld on the day of surgery because of concern for lactic acidosis during hypoperfusion or renal dysfunction, but this concern is much lower for a stable patient having a brief day-case operation. See Sabiston Textbook of Surgery, “Diabetes Mellitus,” lines 3744-3747, and Miller’s Anesthesia, “Diabetes Mellitus,” lines 890-897. A recent review also documents the variation among guidelines in whether metformin is continued or withheld on the operative day: perioperative diabetes review.
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