Cardiomyopathy

Cardiomyopathies represent a diverse group of myocardial disorders in which the structure and function of the heart muscle are abnormal, independent of coronary artery disease, hypertension, valvular disease, or congenital anomalies. For anesthesiologists, these conditions are far more than a cardiology classification—they define the heart’s response to anesthetic drugs, fluid shifts, and perioperative stress. In the operating room, the myocardium’s mechanical and electrical behavior under anesthesia can change dramatically depending on the underlying cardiomyopathy. A ventricle that cannot contract well (as in dilated forms), cannot relax properly (as in restrictive forms), or becomes hypercontractile and obstructive (as in hypertrophic forms) will each require a distinct anesthetic approach. Even when left ventricular ejection fraction appears “normal,” the physiological substrate may predispose the patient to sudden arrhythmias, hemodynamic collapse, or poor tolerance to standard anesthetic agents. From a clinical anesthesia perspective, understanding cardiomyopathies is crucial because: Anesthetic drugs can unmask or worsen hemodynamic instability. Agents such as propofol, volatile anesthetics, and opioids alter preload, afterload, and contractility in ways that interact unpredictably with abnormal myocardium. Fluid and vasopressor management must be individualized. A preload-dependent restrictive heart may fail with minimal hypovolemia, while a dilated, poorly contractile ventricle may not tolerate volume loading or excessive afterload. Arrhythmogenic potential varies. Electrical instability—from ventricular arrhythmias in arrhythmogenic right ventricular cardiomyopathy to QT prolongation in stress cardiomyopathy—demands vigilance in drug choice and intraoperative monitoring. Invasive monitoring and echocardiographic assessment become central tools. Continuous arterial pressure, central venous pressure, or transesophageal echocardiography (TEE) can guide minute-to-minute management decisions that profoundly impact outcomes. Perioperative triggers can precipitate decompensation. Surgical stress, intubation, emergence, and postoperative pain can evoke catecholamine surges or abrupt hemodynamic shifts that the diseased myocardium cannot buffer effectively. Thus, for anesthesiologists, cardiomyopathies should not be seen as rare curiosities but as critical modifiers of anesthetic strategy. Recognizing the type, understanding its pathophysiology, and anticipating its hemodynamic behavior allow clinicians to design a physiology-guided, patient-specific plan—balancing myocardial protection, oxygen delivery, and circulatory stability throughout the perioperative continuum. In the following sections, each major form of cardiomyopathy—dilated, hypertrophic, restrictive, arrhythmogenic right ventricular, and Takotsubo—will be discussed in detail, focusing on how their unique pathophysiological signaturestranslate into anesthetic implications, drug choices, and monitoring priorities for safer perioperative care.