Acoustic cardiography augments prolonged QRS duration for detecting left ventricular dysfunction

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Diagnostics

Background:

• Prolonged QRS duration is a traditional marker for left ventricular systolic dysfunction (LVSD) in heart failure patients.
• Current diagnostic methods may not fully capture the nuances of cardiac function.

Purpose of the Study:

• To compare the diagnostic efficacy of QRS duration with a novel acoustic cardiographic score for identifying LVSD.
• To evaluate a cost-effective bedside screening tool for heart failure assessment.

Main Methods:

• 171 patients with suspected heart failure underwent echocardiography and acoustic cardiography (digital ECG and heart sounds).
• A diagnostic score was derived from four acoustic cardiographic parameters.
• The performance of QRS duration and the score were compared in learning and test populations.

Main Results:

• The acoustic cardiographic score demonstrated higher sensitivity and specificity for LVSD than QRS duration in the learning population (77%/90% vs. 51%/92%).
• The score outperformed QRS duration in detecting both LVSD and acute decompensated heart failure in the test population.

Conclusions:

• Simultaneously acquired digital ECG and heart sound data offer an improved method for identifying LVSD.
• This combined acoustic cardiographic approach provides a cost-effective bedside screening tool for heart failure.
• Enhanced identification of LVSD and clinical heart failure is achievable with this innovative method.