Coronary angioplasty with gradual versus rapid balloon inflation: initial results and complications.

Although a variety of coronary angioplasty balloon inflation protocols are employed, prior studies have not evaluated the relation of rate of inflation to the type and extent of arterial damage produced by angioplasty We randomized 103 patients to either a gradual (gradual, incremental increase to peak inflation pressure) or rapid inflation protocol (rapid increase to peak inflation pressure). Fifty-one patients with 72 lesions underwent gradual and 52 patients with 73 lesions received rapid inflation protocols. There were no significant group differences with regard to age, sex, artery dilated, number of diseased vessels, presence of unstable angina and lesion morphological characteristics except for more lesions located on a bend in the gradual inflation group (p < 0.02). Although there was a tendency towards a higher success rate in patients with gradual inflation, the complete success rates were high in both groups (100% vs. 93%, p < 0.08). The dissection rate was higher in patients with rapid inflation (43/73 [59%] vs. 26/72 [36%], p < 0.01). The collective complication rate was higher in patients with rapid inflation (19% vs. 6%, p < 0.03). No deaths occurred in either group. Thus a gradual compared to rapid coronary angioplasty balloon inflation protocol reduces the frequency of dissection despite similar inflation pressure and balloon/vessel diameter ratio. Gradual inflations may reduce the frequency of procedure-related complications. (C) 1993 Wiley-Liss, Inc.