Arterial wave reflections and ventricular-vascular interaction in patients with left ventricular systolic dysfunction

Area of Science:

• Cardiovascular Physiology
• Hemodynamics
• Heart Failure Research

Background:

• Central aortic pressure waveform (AoPW) results from left ventricular (LV) ejection and wave reflections.
• Ventricular-vascular coupling significantly influences cardiovascular dynamics.
• Left ventricular systolic dysfunction (LVSD) alters cardiac output and vascular impedance.

Purpose of the Study:

• To investigate the impact of varying degrees of LVSD on AoPW morphology.
• To assess the role of ventricular-vascular coupling in shaping AoPW in heart failure patients.
• To utilize pulse wave analysis (PWA) for evaluating AoPW and LV function.

Main Methods:

• Applanation tonometry was used to measure AoPW and LV function.
• Study included 26 controls, 14 patients with LVEF > 30% (moderate LVSD), and 12 patients with LVEF ≤ 30% (severe LVSD).
• Pulse wave analysis (PWA) parameters were analyzed and correlated with Doppler echocardiographic measures.

Main Results:

• Patients with severe LVSD (LVEF ≤ 30%) exhibited lower augmentation pressure, augmentation index, wasted energy, and ejection duration compared to moderate LVSD and controls.
• Augmentation index inversely correlated with mitral E-wave amplitude and E/A ratio, and directly with E-wave deceleration time.
• Severe LVSD was associated with negative interference of aortic wave reflections on LV function and shortened ejection duration.

Conclusions:

• In severe LVSD, aortic wave reflections detrimentally affect LV function, shortening ejection duration.
• AoPW morphology in moderate LVSD patients resembles that of control subjects.
• Ventricular-vascular coupling plays a crucial role in modulating AoPW in heart failure.