Right Ventricular Waveform
The rise in pressure begins simultaneously with ventricular depolarization (the QRS).  When the right ventricle pressue is measured from a pulmonary artery catheter, the distance between the catheter tip and the transducer produces a delay between the QRS and the appearance of the rise in ventricular pressure (note the red line).

With a sinus rhythm, a small pressure rise in the right ventricular pressure occurs as the atrial contracts and increases the ventricular volume.  This pressure rise is identified by the blue arrow.
 

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Last Updated March 24, 2009 | © 2007, LHSC, London Ontario Canada