Evaluation of Left Ventricular Volumes by Real-Time 3-Dimensional Echocardiography

Quantitative measurements of left ventricular volume and ejection fraction are useful in the management of patients with heart disease. Several imaging methods exist, but are limited by cost, invasiveness, or exposure to radio-isotopes. Conventional echocardiography is a noninvasive method that allows estimation of left ventricular size and function; however, quantitative measurements of volume are not widely used due to lack of reproducibility and inaccurate measurements. Real-time three-dimensional echocardiography is a new technique that can be used to derive volume measurements from a single image acquisition. We hypothesize that real-time three-dimensional echocardiography is an accurate method for making left ventricular volume measurements. We therefore propose to measure left ventricular volumes using real-time three-dimensional echocardiography in human subjects and correlate these measurements with magnetic resonance imaging, a more accurate noninvasive method for obtaining these measurements.

Normal volunteers and patients with any form of heart disease who agree to undergo MRI and echocardiographic examination studies.

Adults older than the age of 18 years.

No pregnancy, atrial fibrillation, unstable angina, recent myocardial infarction (less than 5 days), or other acute medical illness.

No pacemaker, aneurysm clip, neural stimulator, ear implant, and metallic foreign body such as shrapnel or bullets.