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Right
Ventricle Waveform - Direct Measurement
Note that the rise in the right ventricular pressure occurs simultaneous with the QRS (the pressure rise is produced by ventricular depolarization and begins before mechanical systole). The small rise in ventricular pressure that occurs as a result of atrial contraction is identified by the arrow. |
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Right
Ventricular Waveform - From Pulmonary Artery Catheter
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. |
