Mechanical dyssynchrony and diastolic dysfunction are common in LVH: a pilot correlation study using Doppler...

Area of Science:

• Cardiology
• Medical Imaging
• Genetics

Background:

• Hypertrophic cardiomyopathy (HCM) is the most common inherited cardiovascular disorder, affecting 1 in 500 individuals.
• It is often under-diagnosed and can lead to left ventricular hypertrophy (LVH), presenting in various forms (apical, concentric, septal).
• Sudden cardiac death can be the first manifestation of HCM, even in asymptomatic individuals.

Purpose of the Study:

• To investigate systolic and diastolic dysfunction and perfusion abnormalities in patients suspected of HCM.
• To evaluate the utility of Doppler echocardiography and gated single-photon emission computerized tomography (SPECT) myocardial perfusion imaging (MPI) in HCM diagnosis.
• To identify subtle functional changes in HCM by combining imaging modalities.

Main Methods:

• Retrospective enrollment of patients with suspected HCM without coronary stenosis.
• Utilized Doppler echocardiography for diastolic function assessment.
• Employed state-of-the-art gated SPECT MPI with a cadmium-zinc-telluride camera and thallium-201 for regional perfusion and mechanical dyssynchrony analysis.

Main Results:

• Mild ischemia was frequently observed in suspected HCM patients (mean summed stress score 4.7 ± 4.9).
• HCM patients exhibited significant left ventricular mechanical dyssynchrony, particularly the apical form.
• Prevalent diastolic dysfunction was noted, with distinct early to late ventricular filling velocity ratios across groups.

Conclusions:

• Gated SPECT MPI and Doppler echocardiography can identify mild ischemia and mechanical dyssynchrony in HCM.
• Combining these advanced imaging techniques aids in detecting subtle functional changes characteristic of HCM.
• Early detection of these abnormalities is crucial for managing HCM and preventing adverse events.