Radionuclide left ventricular volume curves in angiographically proved normal subjects and patients with three-vessel coronary disease

Area of Science:

• Cardiology
• Nuclear Medicine
• Diagnostic Imaging

Background:

• Coronary artery disease (CAD) significantly impacts left ventricular (LV) function.
• Radionuclide ventriculography is utilized to assess cardiac performance.
• Differentiating between normal coronary arteries (NL) and significant CAD requires accurate diagnostic tools.

Purpose of the Study:

• To evaluate the diagnostic utility of radionuclide left ventricular volume curve measurements.
• To compare LV volume dynamics between patients with NL and three-vessel CAD (3V CAD) at rest and during exercise.

Main Methods:

• Comparison of 12 patients with NL and 12 patients with 3V CAD.
• Measurement of LV ejection and filling rates, timing, durations, and filling fractions.
• Assessment of parameters at rest and during supine bicycle exercise.

Main Results:

• At rest, 3V CAD patients showed a delayed maximal filling time and reduced first third filling fraction, but with significant overlap.
• During exercise, 3V CAD patients exhibited lower maximal and mean ejection and filling rates.
• These radionuclide volume measurements did not significantly improve diagnostic separation beyond heart rate and ejection fraction.

Conclusions:

• Instantaneous changes in left ventricular volume from radionuclide curves provide minimal additional diagnostic information for CAD.
• Current radionuclide volume measurements are insufficient for reliably distinguishing between NL and 3V CAD.
• Further research may be needed to identify more discriminative radionuclide parameters for CAD diagnosis.