Stoelting's Anesthesia and Co-Existing Disease · 8th Edition
Pericardial Disease and Cardiac Trauma
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Key Takeaways
- The pericardial pressure-volume relationship exhibits a steep compliance curve where initial fluid accumulation produces minimal pressure change until reserve capacity is exceeded, then rapid pressure elevation occurs.
- Cardiac tamponade pathophysiology involves equalization of diastolic pressures across all cardiac chambers as pericardial fluid externally compresses ventricular filling throughout diastole.
- Anesthetic induction in tamponade requires sympathomimetic-sparing agents and maintenance of spontaneous ventilation to preserve venous return before definitive pericardiocentesis.
- Constrictive pericarditis produces characteristic "square root sign" on ventricular pressure tracings with prominent diastolic dip followed by plateau, distinguishing it from restrictive cardiomyopathy.
- Commotio cordis results from mechanical disruption of cardiac electrophysiology during ventricular repolarization, typically causing ventricular fibrillation without structural myocardial damage.
- Traumatic aortic injury occurs most commonly at the aortic isthmus due to deceleration forces creating differential acceleration between mobile ascending aorta and relatively fixed descending aorta.
Chapter SummaryWhat this audio overview covers
Pericardial disease and cardiac trauma represent critical challenges in perioperative medicine, requiring anesthesiologists to understand both the structural features of the pericardium and the pathophysiologic consequences of its dysfunction. The pericardium functions as a protective fibroserous structure containing a small volume of serous fluid that permits cardiac motion while constraining excessive chamber enlargement through its rigid collagen matrix. This anatomic constraint creates a distinctive pressure-volume relationship where initial volume changes produce minimal pressure elevation, but progressive accumulation beyond the pericardial reserve triggers steep pressure rises that impair ventricular filling and cardiac output. The pericardium also mediates ventricular interdependence, allowing right ventricular filling changes during the respiratory cycle to directly influence left ventricular diastolic properties and systemic perfusion. Pericarditis, the most frequent inflammatory condition, presents as pleuritic chest discomfort accompanied by characteristic electrocardiographic changes and pericardial effusion; acute management relies on nonsteroidal anti-inflammatory agents and colchicine. Postcardiac injury syndromes, including Dressler syndrome following myocardial infarction, represent autoimmune-mediated inflammatory responses that may develop weeks after the initial insult. Cardiac tamponade emerges when pericardial fluid accumulation compresses the cardiac chambers, producing hypotension, muffled cardiac sounds, and elevated venous pressure; echocardiography reveals chamber collapse during diastole and respiratory variation in transmitral flow. Anesthetic management of patients with tamponade demands invasive hemodynamic monitoring before induction, careful selection of induction agents that preserve sympathetic tone, and consideration of awake pericardiocentesis in unstable patients. Constrictive pericarditis develops through chronic inflammation producing a thickened, inelastic pericardial layer that restricts diastolic filling and elevates ventricular pressures; pericardiectomy provides the definitive treatment for symptomatic disease. Cardiac trauma encompasses blunt myocardial injury with wall motion abnormalities or myocardial necrosis, commotio cordis from low-velocity chest wall impact during ventricular repolarization, penetrating injuries from penetrating wounds with high mortality rates, and traumatic aortic injuries concentrated at the aortic isthmus from deceleration mechanisms.