Aim: As a part of the grant „Contrast-enhanced MRI versus thallium myocardial perfusion SPECT in detection of viable left ventricle myocardium before coronary artery bypass graft (CABG)“ the reproducibility of rest equilibrium ECG gated radionuclide ventriculography (RNV) was evaluated. Since all patients in this study underwent coronary angiography with X-ray ventriculography, the authors could perform a comparison of left ventricle ejection fraction (EF) between radionuclide and X-ray ventriculography. Material and method: Fourteen patients (12 men, 2 women, being aged 42-74, with median of 55 years) with coronary artery disease underwent coronary angiography and X-ray ventriculography. After a few weeks RNV (500 cycles, matrix 64 x 64, 24 frame per cycle, low-energy all purpose collimator, left anterior oblique view) was performed. In vivo labeled red blood cells by 99mtechnetium (750 MBq) were used as a radiopharmaceutical. The acquisition was made by digital gamma camera Helix Elscint (LEAP collimator). After 30 minutes the authors started next RNV with the same patient and the same acquisition parameters. That means the acquisition was made twice. Results: The juxtaposition of measurement of the left ventricle ejection fraction (RNV ejekčversus X-ray ventriculography) by limits of agreement was performed. Reproducibility of RNV was very good (4% on both sides). The agreement between EF 1 RNV and X-ray ventriculography (20% on both sides) or EF 2 RNV and X-ray ventriculography (22% on both sides) was not very good. Conclusion: The reproducibility of RNV was very good. Poor agreement of the measurement of left ventricle ejection fraction between RNV and X-ray ventriculography was detected.

        Key words: radionuclide ventriculography – X-ray ventriculography