Figure 2.

Simultaneous Pressure Recordings Obtained From the Right Atrium and Pericardium Before, During, and After Pericardiocentesis

(A) Pressure recordings obtained from the right atrium (RA) and pericardium (P) before pericardiocentesis demonstrating right atrial (RA) pressure of 34 mm Hg and pericardial opening pressure of 23 mm Hg. (B) Pressure recordings obtained following pericardiocentesis of 200 mL serosanguinous pericardial effusion demonstrating RA pressure of 31 mm Hg and pericardial pressure of 16 mm Hg. (C) Pressure recordings immediately following pericardiocentesis of 320 mL serosanguinous pericardial effusion demonstrating RA pressure of 30 mm Hg and pericardial pressure of 12 mm Hg.