[Use of normalized velocities in the echocardiographic evaluation of left ventricular performance]

Area of Science:

• Cardiology
• Biomedical Engineering
• Echocardiography

Context:

• Left ventricular performance is typically assessed using mean circumferential contraction rate (Mvcf) and ejection fraction (EF).
• Septal asynchronism, caused by fibrosis or bundle-branch block, can impede accurate Mvcf and EF determination.
• Alternative methods are needed for reliable cardiac function evaluation in specific patient populations.

Purpose:

• To evaluate the utility of posterior wall velocity (PWV) and normalized systolic posterior wall velocity (Vpws) as alternative echocardiographic parameters.
• To determine if PWV and Vpws can accurately reflect Mvcf and EF in patients with conditions affecting septal motion.
• To establish non-invasive methods for assessing cardiac performance when standard parameters are compromised.

Summary:

• Investigation in normal subjects and patients with idiopathic hypertrophic subaortic stenosis demonstrated that PWV closely correlates with Mvcf.
• Vpws showed a strong correlation with both Mvcf and EF, indicating its potential as a reliable parameter.
• These findings suggest that PWV and Vpws provide sufficiently reliable data for evaluating cardiac performance non-invasively.

Impact:

• Offers a non-invasive approach to assess cardiac function, particularly in patients where standard echocardiographic measurements are challenging.
• Expands the utility of echocardiography by providing alternative parameters for left ventricular performance assessment.
• Potentially improves diagnostic capabilities and patient management in cardiology by enabling reliable functional evaluation.