Evolution of Echocardiography-Derived Hemodynamic Force Parameters After Cardiac Resynchronization Therapy

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Imaging

Background:

• Heart failure (HF) is characterized by impaired cardiac function and altered intraventricular pressure gradients.
• Echocardiography-derived hemodynamic forces (HDF) offer a novel method to quantify these gradients.
• The impact of cardiac resynchronization therapy (CRT) on HDF in large cohorts remains under-investigated.

Purpose of the Study:

• To assess hemodynamic forces (HDF) in patients with heart failure undergoing CRT compared to healthy controls.
• To evaluate the changes in HDF before and after CRT implantation.
• To determine the long-term effects of CRT on HDF and intraventricular pressure gradients.

Main Methods:

• Calculated HDF parameters including apical-basal strength, lateral-septal strength, their ratio, and force vector angle.
• Assessed HDF in 197 heart failure patients (LVEF ≤35%, QRS ≥130ms, LBBB) and healthy controls.
• Measured HDF before CRT, immediately after, and 6 months post-CRT, with a temporary deactivation at 6 months.

Main Results:

• Patients with heart failure exhibited significantly lower HDF magnitude and worse orientation compared to controls.
• CRT implantation acutely increased apical-basal impulse and systolic force vector angle.
• Six months post-CRT, improvements in HDF magnitude and orientation were observed, with some parameters remaining improved after deactivation.

Conclusions:

• HDF in CRT recipients reflect both the acute effects of CRT and the impact of left ventricular reverse remodeling.
• Changes in HDF provide insights into the modulation of intraventricular pressure gradients by CRT.
• Further research is needed to ascertain the incremental value of HDF analysis over standard echocardiographic parameters.