RADIONUCLIDE KYMOGRAPHY FOR ASSESSMENT OF REGIONAL MYOCARDIAL WALL MOTION

  • 1 January 1978
    • journal article
    • research article
    • Vol. 19  (10) , 1131-1137
Abstract
Regional myocardial wall motion is usually evaluated qualitatively from ECG-gated end-systolic and end-diastolic blood-pool images. Radionuclide kymography, which displays a 1-dimensional scintigraphic image in time, synchronized with the ECG, provides a method to quantitate this motion. The technique is analogous to M-mode ultrasound in that 1 dimension is displayed as a function of time, but the activity distribution is displayed in place of acoustic interfaces. The motion of regional myocardial segments can be measured from multiple kymographic projections across the cardiac blood pool, after equilibration of a radioactive tracer. Radionuclide kymography is potentially better quantitatively than gated blood-pool imaging and is not hindered by viewing windows as are single- and multiple-transducer ultrasonography. Regional wall motion determined from radionuclide kymography correlated well with that determined from contrast left ventriculography in a series of patients. Since the kymographic sweep is initiated by the R wave of the ECG and proceeds continuously throughout the cardiac cycle, the temporal sequence of regional myocardial contraction can be directly assessed and related to corresponding portions of the ECG.