1974 Volume 15 Issue 6 Pages 543-553
Anew technique of precordial counting with 131IMAA for measurement ofright ventricular residual ratio (RVRR) was described. 131IMAA was rapidly injected into the right ventricle at the time of right heart catheterization. The fraction of isotope discharged from this chamber per beat was determined with a crystal detector with tapered collimator which was pointed to the center of right ventricle. The radioisotope dilution curve was corrected by using the lung built up curve recorded by the other detector pointed to the lung field. Then, the right ventricular endsystolic volume (ESV) and the right ventricular enddiastolic volume (EDV) were calculated from the RVRR and stroke volume.
In 6 patients with normal hemodynamics, the RVRR averaged 57.8±4.9%, the ESV 52.2±13.6ml/M2 and the EDV 89.4±15.1ml/M2. In 16 patients with heart diseases, the RVRR averaged 60.6±7.1%, the ESV 80.6±34.0ml/M2 and the EDV 127.2±43.6ml/M2. In 11 patients with chronic pulmonary diseases, the RVRR averaged 70.7±9.9%, the ESV 94.7±42.4ml/M2 and the EDV 133.0±46.5ml/M2. The RVRR in the last group increased significantly.
