Hemodynamic tracings showing weaning from cardiopulmonary bypass

During weaning from cardiopulmonary bypass, venous return to the pump is reduced, the heart gradually fills, and the ART tracing becomes pulsatile. Image A shows the beginning of the weaning process, with the patient requiring AV pacing at 80 beats per minute for bradycardia. The ART is 68/57 mmHg, the PAP is 4/2 mmHg and the CVP is 6 mmHg.

With further reduction of venous return to the pump, the ART tracing becomes more pulsatile as additional cardiac filling generates a larger stroke volume and pulse pressure. The tracing shows this phase of weaning from bypass, with an ART pressure of 106/61 (mean 76) mmHg, PAP of 28/20 (mean 26) mmHg, and CVP of 11 mmHg. AV pacing continues.