Stoelting's Anesthesia and Co-Existing Disease · 8th Edition
Ischemic Heart Disease
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Key Takeaways
- Ischemic heart disease results from myocardial oxygen supply-demand mismatch, most commonly from atherosclerotic coronary artery narrowing exceeding 70 percent stenosis.
- Perioperative myocardial infarction typically develops from prolonged demand ischemia rather than plaque rupture and may occur silently, detected only by troponin elevation.
- Preoperative cardiac risk assessment uses metabolic equivalents and the Revised Cardiac Risk Index to identify six independent predictors of perioperative complications.
- Patients with coronary stents require continuation of dual antiplatelet therapy perioperatively because early discontinuation substantially increases thrombosis risk and timing depends on stent type.
- Intraoperative management maintains oxygen balance through hemodynamic control within 20 percent of baseline parameters and continuous ECG monitoring with ST-segment analysis.
- Cardiac transplant recipients have denervated hearts lacking autonomic innervation, creating extreme preload dependence and altered responses to sympathomimetic and vagolytic medications.
Chapter SummaryWhat this audio overview covers
Myocardial oxygen supply-demand imbalance underlies ischemic heart disease, a condition affecting approximately 30 percent of surgical patients annually in the United States, primarily through atherosclerotic narrowing of coronary vessels. The disease manifests across a clinical spectrum ranging from chronic stable angina, characterized by reproducible chest discomfort during exertion when a coronary artery stenosis exceeds 70 percent, to acute coronary syndromes including ST-elevation myocardial infarction from complete thrombotic occlusion and non-ST-elevation presentations from partial occlusion or microcirculatory dysfunction. Acute myocardial events carry serious complications such as ventricular dysrhythmias, cardiogenic shock, mechanical rupture, and mitral insufficiency. Preoperative risk assessment relies on functional capacity measured in metabolic equivalents and validated scoring systems like the Revised Cardiac Risk Index, which identifies six independent predictors of perioperative cardiac complications. Patients with coronary stents present unique challenges because premature dual antiplatelet therapy discontinuation substantially increases stent thrombosis risk, necessitating careful surgical timing based on stent type. Perioperative myocardial infarction most commonly results from prolonged demand ischemia rather than acute plaque rupture, often occurs silently within days of surgery, and is detected through troponin elevation rather than clinical presentation. Intraoperative management prioritizes maintaining oxygen supply-demand balance through strict hemodynamic control within 20 percent of baseline heart rate and blood pressure, blunting sympathetic responses to intubation, and utilizing continuous ECG monitoring with ST-segment analysis. Specialized considerations apply to cardiac transplant recipients whose denervated hearts lack autonomic innervation, preventing reflex tachycardia and anginal symptoms while creating extreme preload dependence and altered drug responsiveness to indirect-acting sympathomimetics and vagolytic agents.