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荷兰鹿特丹市胸科中心的Kamp，O和Serruys，PW在美心脏杂志（1989；117（5）:991）著文称：他们对连续收治的840例所有已行PTCA的心绞痛病人进行随访分析。随访时限为术后平均25月（6～66m）。病人分成稳定型心绞痛（Ⅰ组，506例）和非稳定型心绞痛（Ⅱ组，334例）两组，以下四种情况作为随访终点；死亡、非致死心肌梗塞、返复心绞痛而需行搭桥手术或再度PTCA和无症状健在。两组在年龄、性别、心肌梗塞史、射血分数和患病冠脉支数等五方面皆属可比范围。PTCA的成功率，Ⅰ组为83.0％，Ⅱ组为87.1％。两组的生存率也相似，两组病死率在25月后
Kamp, O, and Serruys, PW, in the Thoracic Center, Rotterdam, The Netherlands, author of the article in the Journal of the American Heart Association (1989; 117 (5): 991) states that they followed up 840 consecutive patients with angina pectoris who underwent PTCA. The follow-up time was 25 months (6 ~ 66m) after surgery. The patients were divided into two groups: stable angina pectoris (group Ⅰ, 506 cases) and unstable angina pectoris (group Ⅱ, 334 cases). The following four kinds of cases were taken as the end of follow-up; death, non-fatal myocardial infarction, Or PTCA and asymptomatic again. Both groups were comparable in five aspects, including age, gender, history of myocardial infarction, ejection fraction, and coronary artery disease. The success rate of PTCA was 83.0% in group I and 87.1% in group II. Survival rates were similar in both groups, with mortality rates after 25 months in both groups