Hypertrophic Cardiomyopathy Is Associated with Altered Left Ventricular 3D Blood Flow Dynamics

Area of Science:

• Cardiovascular Imaging
• Biomedical Engineering
• Medical Physics

Background:

• Hypertrophic cardiomyopathy (HCM) is a complex heart muscle disease.
• Understanding the hemodynamic alterations in HCM is crucial for patient management.
• Systolic anterior motion (SAM) and mitral regurgitation (MR) are common complications in HCM.

Purpose of the Study:

• To investigate the association between hemodynamic parameters and clinical manifestations in HCM using 4D flow MRI.
• To quantify elevated velocity volumes (EVV) in the left ventricle (LV) of HCM patients.
• To correlate EVV with SAM, MR, stroke volume, and cardiac mass.

Main Methods:

• 13 patients with HCM and 11 healthy controls underwent 4D flow MRI.
• Left ventricular (LV) velocity maps were analyzed to calculate EVV.
• Standard cine imaging assessed SAM, MR, stroke volume, and cardiac mass.

Main Results:

• Systolic EVV in HCM patients was significantly associated with elevated aortic peak velocity, decreased LV outflow tract diameter, and increased cardiac mass.
• EVV was significantly higher in patients with SAM and MR compared to those without.
• Diastolic LV velocity correlated with septal thickness.

Conclusions:

• Quantification and visualization of EVV in the LV are feasible using 4D flow MRI.
• EVV may provide valuable insights into the altered hemodynamics and clinical manifestations of HCM.
• 4D flow MRI is a promising tool for evaluating HCM patients.