Figure 12
Digitized Recordings of Left Ventricular Variation in Respiratory Cycle. High-fidelity micromanometer recordings of left ventricular (PLV and aortic pressure (PAO) before and after pericardiocentesis, digitized from clinical data published in [33]. Control (Panel A) is assumed to be post-pericardiocentesis. In both panels, a single cardiac cycle during expiration has been overlaid with a single cardiac cycle during inspiration, aligned at aortic valve closure for comparison. In the control case (Panel A), pressures drop slightly on inspiration. With tamponade (Panel B) pressures fall significantly in systole, pre-ejection period is delayed in cardiac cycle, and ejection time is reduced. Data from Murgo et al. [33], specifically, Figs. 2–3, pp. 193–4.