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Difficulty: HardCardiovascular System

A 64-year-old man presents to the outpatient clinic reporting a 2-month history of retrosternal chest tightness. The discomfort occurs predictably after walking two blocks and resolves completely with 5 minutes of rest. He has a history of type 2 diabetes mellitus, hyperlipidemia, and hypertension. Current medications include lisinopril and metformin. Vital signs are within normal limits. Physical examination is unremarkable. A resting 12-lead electrocardiogram shows normal sinus rhythm without ST-segment or T-wave abnormalities.

Arrange the following steps in the most appropriate sequential order for the optimal long-term evaluation and management of this patient's condition, assuming each successive step reveals findings that appropriately warrant further escalation of care.

  1. 1Initiate guideline-directed medical therapy with aspirin, a beta-blocker, and a high-intensity statin.
  2. 2Perform a non-invasive exercise electrocardiography stress test.
  3. 3Perform invasive coronary angiography.
  4. 4Consult cardiothoracic surgery for coronary artery bypass grafting (CABG).

Answer

The correct sequence of evaluation and management for stable ischemic heart disease begins with initiating optimal medical therapy, followed by non-invasive risk stratification (exercise stress testing). If the stress test shows high-risk features, invasive coronary angiography is indicated. If angiography reveals severe multi-vessel disease in this diabetic patient, coronary artery bypass grafting is the final definitive step.
The patient's clinical presentation is classic for stable angina (predictable exertional chest pain relieved by rest). The standard of care mandates that stable ischemic heart disease initially be managed with optimal medical therapy, which includes antianginal agents (beta-blockers) and cardioprotective medications (aspirin, statins). Once on medical therapy, risk stratification is required using a non-invasive stress test. An exercise ECG is the test of choice for patients who can exercise and have a normal resting ECG. If the stress test is positive with high-risk features, the patient must proceed to invasive coronary angiography to evaluate the anatomy for potential revascularization. Finally, in a patient with diabetes, if angiography reveals extensive multi-vessel coronary artery disease, coronary artery bypass grafting (CABG) provides a mortality benefit over percutaneous coronary intervention and is the appropriate definitive intervention.

Step-by-Step Solution

1
Diagnose stable angina and initiate medical therapy.
The patient is started on aspirin, a statin, and a beta-blocker.
Medical therapy is the foundational treatment for stable ischemic heart disease to prevent acute coronary events and manage anginal symptoms.
2
Assess the risk of adverse cardiovascular events using non-invasive testing.
An exercise ECG stress test is performed.
Patients with stable angina require risk stratification to determine if they need invasive evaluation. Since he has a normal baseline ECG and can likely walk, an exercise ECG is the preferred initial test.
3
Proceed to anatomic evaluation if the stress test is high-risk.
Invasive coronary angiography is performed.
High-risk findings on stress testing indicate a high likelihood of severe coronary artery disease that may benefit from revascularization.
4
Determine the optimal revascularization strategy based on anatomy and comorbidities.
The patient is referred for coronary artery bypass grafting (CABG).
For patients with diabetes mellitus and multi-vessel coronary artery disease, CABG has been shown to offer a survival advantage over percutaneous coronary intervention (PCI).

Key Concept

Stepwise diagnostic and therapeutic management of stable ischemic heart disease
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Topics

Cardiovascular System

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