[Coronary angioplasty: efficacy of the new low profile balloon catheters].

New low profile balloon catheter have allowed the indication of percutaneous transluminal coronary angioplasty (PTCA) for more complex lesions. We report our initial experience with these systems in 50 out of 101 patients (50%) who underwent a PTCA from March 15 to May 15, 1989 in "Instituto Dante Pazzanese de Cardiologia". Mean age was 58.6 +/- 10.4 years and most of the patients were male (78%). We dilated 54 lesions. Single vessel disease was the case for 84% of the patients. As for the localization of the lesions in the coronary arteries, 56% of the lesions were in the proximal or mid segments of the coronary arteries and the mean diameter stenosis pre-PTCA was 84 +/- 10.2%. Left ventricular function was normal in 60% of the patients. Primary success rate (per patient) was 95% and the coronary stenosis was crossed in all the cases. The mean inflation number was 2.7 +/- 0.6 per patient, the mean highest pressure was 8 +/- 1.15 atm and the mean maximum time of inflation was 86.1 +/- 29.6 sec. The mean residual stenosis was 15.2 +/- 10.6%. There was only one major complication, namely an acute myocardial infarction of the lateral wall. There were no emergency CABG surgery or deaths. We conclude that the new low profile balloon catheters have broadened the indication for PTCA in more complicated lesions, showing a high rate of primary success (95%), but did not increase the number of procedural complications (2.5%).