**Core Concept**
The patient's history of myocardial infarction, peripheral vascular disease, hypertension, and diabetes places him at high risk for cardiovascular complications during surgery. A thorough preoperative evaluation is necessary to assess cardiac function and guide perioperative management.

**Why the Correct Answer is Right**
The patient's symptoms of claudication and history of peripheral vascular disease suggest significant atherosclerotic disease, which increases the risk of cardiac complications during surgery. A persantine thallium stress test evaluates myocardial perfusion and coronary flow reserve, providing valuable information about cardiac function and potential areas of ischemia. Echocardiography complements this information by assessing left ventricular function and wall motion abnormalities. Together, these tests help identify patients at high risk for cardiac complications and guide the anesthesiologist's perioperative management.

**Why Each Wrong Option is Incorrect**
**Option A:** An electrocardiogram (ECG) is a basic screening tool but does not provide sufficient information about cardiac function or coronary perfusion in a patient with a high risk of cardiovascular disease.

**Option B:** An exercise stress test is contraindicated in patients with peripheral vascular disease, as exercise can exacerbate symptoms and increase the risk of cardiovascular events.

**Option C:** Coronary artery bypass grafting (CABG) is not indicated as a preoperative step for ventral hernia repair, as the patient's symptoms and risk factors do not warrant immediate coronary intervention.

**Clinical Pearl / High-Yield Fact**
Patients with a history of peripheral vascular disease and symptoms of claudication are at high risk for cardiac complications during surgery. A thorough preoperative evaluation, including non-invasive cardiac stress testing, is essential to guide perioperative management and minimize the risk of cardiac events.

**✓ Correct Answer: D. He should undergo a persantine thallium stress test and echocardiography.**