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Ann Thorac Surg 2004;77:143-149
© 2004 The Society of Thoracic Surgeons

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Original article: cardiovascular

Left ventricular pressure and volume unloading during pulsatile versus nonpulsatile left ventricular assist device support

^a Department of Thoracic and Cardiovascular Surgery, University Hospital, Muenster, Germany
^b Heart Failure Center, Columbia University, New York, New York, USA
^c Department of Cardiology and Angiology, University Hospital, Muenster, Germany

Accepted for publication June 25, 2003.

^* Address reprint requests to Dr Klotz, Department of Thoracic and Cardiovascular Surgery, University Hospital Muenster, Albert-Schweitzer-Str 33, 48129 Muenster, Germany.
e-mail: stefan.klotz{at}thgms.uni-muenster.de

BACKGROUND: Nonpulsatile axial or centrifugal pumps are the latest generation of left ventricular assist devices (LVAD). Whether left ventricular (LV) unloading and outcome in these devices is similar to pulsatile LVADs during long-term support has not been investigated. We compared LV unloading and mortality between different types of LVAD support (pulsatile versus nonpulsatile).

METHODS: In 31 patients undergoing long-term LVAD implantation (nonpulsatile = 10, pulsatile = 21) preoperative and postoperative echocardiographic and hemodynamic assessment with right heart catheterization had been obtained.

RESULTS: All patients had similar echocardiographic, hemodynamic, and clinical heart failure characteristics at baseline. The degree of LV pressure unloading was the same in both device types, caused by similar reduction of mean pulmonary pressure (18.6 ± 5.1 versus 18.3 ± 7.5 mm Hg) and pulmonary capillary wedge pressure (8.9 ± 4.4 versus 8.0 ± 7.0 mm Hg). Left ventricular volume unloading was pronounced with a pulsatile device owing to a statistically significant higher pump output (5.1 ± 1.0 L/min) in comparison with nonpulsatile LVADs (3.6 ± 0.9 L/min, p < 0.001). Echocardiographic-determined end-systolic indicators confirm this augmentation in pulsatile LVADs. Etiology or the time interval of hemodynamic reassessment had no impact in left ventricular pressure unloading, but LV volume unloading decreased between day 60 and 120 in patients with nonpulsatile LVADs. The preoperative and postoperative transplant mortality was comparable in both groups.

CONCLUSIONS: Left ventricular pressure unloading is similar in patients with nonpulsatile as compared with pulsatile implantable long-term assist devices. Left ventricular volume unloading is pronounced in pulsatile LVADs.

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