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[Radioisotope study (first pass) of left ventricular function in 2 oblique projections using gold-195m after myocardial infarction].

The radioisotope 195Aum because of its short halflife of 30 seconds and reduced radiation exposure allows routine first pass examinations in two oblique projections, i.e. right anterior and left anterior oblique. The value of the additional left anterior oblique projection has been examined in 30 patients after previous myocardial infarction by functional imaging in two oblique projections. The multicrystal gamma camera connected with a microprocessor and a contrast injector have been used. For assessment of left ventricular function the following functional images have been adopted: the regional ejection fractions (rEF), the regional ejection rates (rEJR) and the regional mean transit times (rMTT). The right anterior oblique view resulted diagnostic for miocardial infarction in 26 of 30 patients (86,6%). The left anterior oblique view was informative with respect of septal extension 17 times (58,6%), lateral extension 9 times (31%), septal and lateral extension 3 times. With regard of the different functional images the rMTT showed the severe dysfunction in the infarcted zones in all patients (100%), the rEJR in 29 patients (96,6%), the rEF in 28 cases (93,3%). In 4 cases dyskinesia was observed, twice in the left anterior oblique view and also twice in the right anterior oblique view. In patients with previous MI it is necessary to record the second left anterior oblique projection which can be done routinely by the use of 195Aum and first pass technique. On functional images, maximum information is obtained by the rMTT which visualizes the zones of severe dysfunction and its extension.