A 56-year-old man has been referred to the surgical outpatient department with a right-sided inguinal hernia. He has requested a day surgical procedure. The patient has type 2 diabetes and hypertension. He has no history of a myocardial infarction or angina.

He takes metformin 500 mg tds for his diabetes and atenolol 50 mg daily for his hypertension. He is a non-smoker and drinks fewer than 12 units of alcohol per week. All the vital parameters are within normal limits. Source: 100 Cases in Surgery