Effects of Continuous-Flow Left Ventricular Assist Device Therapy on Peripheral Vascular Function.

Area of Science:

• Cardiovascular Medicine
• Vascular Biology
• Medical Devices

Background:

• Peripheral vascular function in end-stage heart failure (HF) patients undergoing continuous-flow left ventricular assist device (CF-LVAD) implantation is not well understood.
• Assessing vascular changes is crucial for managing advanced HF patients.

Purpose of the Study:

• To evaluate peripheral vascular function before and after CF-LVAD implantation.
• To compare vascular function in CF-LVAD patients with chronic heart failure with reduced ejection fraction (HFrEF) patients.

Main Methods:

• Compared peripheral vascular function (flow-mediated dilation [FMD] and pulsatility index [PI]) using ultrasound Doppler in 43 end-stage HF patients pre- and post-CF-LVAD implantation.
• Matched CF-LVAD patients with age- and sex-matched chronic HFrEF patients.

Main Results:

• End-stage HF patients had lower preoperative FMD and PI compared to chronic HFrEF patients.
• CF-LVAD implantation significantly decreased median FMD (5.4% to 3.7%) and PI (6.9 to 1.4).
• Peripheral vascular function deteriorated after CF-LVAD implantation.

Conclusions:

• End-stage HF patients exhibit impaired peripheral vascular function compared to stable HFrEF patients.
• CF-LVAD implantation leads to a deterioration of peripheral vascular function.
• Nonpulsatile blood flow from CF-LVAD likely causes these vascular changes.