A 48 year old man has diabetes and is on Metformin alone. His plasma glucose is well controlled. This man is scheduled to undergo a coronary angiogram. Is any change necessary in his diabetes treatment?

  1. No change is necessary because the diabetic control is good.
  2. Metformin can be continued but he will also need short acting insulin in multiple doses given according to a sliding scale.
  3. Metformin should be stopped. Insulin can be given for control of plasma glucose if needed.

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