The Clinical Problem Solvers Episode 362 – WDx #32: Stiff Shells and Stiff Hearts—Dissecting Constrictive Pericarditis & Restrictive Cardiomyopathy
Oct 31, 2024
A deep dive into two causes of a “stiff” heart: tight pericardial shells that limit filling and intrinsically rigid ventricles from myocardial disease. Listeners hear hemodynamics like equalized diastolic pressures and ventricular interdependence. Practical diagnostics, imaging strategies, and distinct treatment pathways, including surgery, amyloid testing, and device considerations, are highlighted.
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Stiff Shell Causes Equalized Diastolic Pressures
- Constrictive pericarditis is a stiff fibrotic pericardial shell that limits cardiac expansion and causes high, equalized diastolic pressures across all chambers.
- Kaylin explains the shell creates early rapid filling then abrupt mid/late diastolic arrest, producing elevated equalized diastolic pressures.
Respiration Normally Augments Right Heart Filling
- Normal inspiration lowers intrathoracic pressure which transmits to intrathoracic heart chambers and pulmonary veins but not to extrathoracic SVC/IVC, increasing right heart filling.
- Kaylin uses this physiology to show why the compliant RV can accommodate inspiratory flow without big pressure rises in health.
Pericardial Decoupling Drives Ventricular Interdependence
- In constrictive pericarditis the stiff pericardium decouples intracardiac pressures from intrathoracic pressure so pulmonary vein pressure falls with inspiration while left chambers do not, reducing LV filling.
- This drop in LV filling allows RV filling to increase and causes septal shift (ventricular interdependence) seen on exam/echo with respiration.