(Circulation. 1995;91:2868-2875.)
© 1995 American Heart Association, Inc.
Articles |
Has Improvement in PTCA Intervention Affected Long-term Prognosis?
The NHLBI PTCA Registry Experience
From the University of Pittsburgh, Pa (K.D., W.Y., S.K.); Rhode Island Hospital, Providence (D.W.); NHLBI, Bethesda, Md (P.D-N.); the Mayo Clinic, Rochester, Minn (D.H.); the Montreal (Quebec) Heart Institute (M.B.); Emory University, Atlanta, Ga (S.K.); the University of Southern California, Los Angeles (D.F.); and the Washington (DC) Hospital Center (K.K.).
Correspondence to Katherine M. Detre, MD, DrPH, Professor of Epidemiology, University of Pittsburgh, A531 Crabtree Hall/GSPH, Pittsburgh, PA 15261.
Background The NHLBI Percutaneous Transluminal Coronary Angioplasty (PTCA) Registry followed 1345 consecutive patients with first PTCA between 1977 and 1981 (registry 1) and 2136 consecutive patients with PTCA between 1985 and 1986 (registry 2). Changes in patient selection and in immediate and 1-year outcome are presented. This report extends to 5 years the comparison of the effects of early and more recent management with PTCA.
Methods and Results Sixteen participating centers entered
consecutive patients who had angioplasty for the first time between
1977 and 1981 and between 1985 and 1986. Patients with recent
myocardial infarction (MI) were excluded. Vessel disease was defined
according to the Coronary Artery Surgery Study. Successful dilatation
required 
20% reduction in luminal narrowing and <50% lumen
diameter stenosis after intervention. Routine annual follow-up was
conducted by telephone interview. The product-limit method was used to
estimate freedom from untoward events, Cox regression analysis to
model relative risk and adjusted relative risk of events between the
two registries, and logistic regression when the exact time of outcome
(such as recurrence of symptoms) was not known. Long-term event rates
were computed by vessel disease for all patients and for the cohort of
patients with initially successful PTCA. After adjustment for extent of
disease, diabetes, prior bypass surgery (CABG), hypertension, age, and
sex, the 5-year risk of death was similar in the two registry cohorts.
However, rates of MI, CABG, and a combined outcome measure of death,
MI, and/or CABG were significantly lower in the registry 2 cohort both
for all patients and for patients who were initially treated
successfully. Use of repeated PTCA was higher, and freedom from
symptoms without adverse events was significantly better in the latter
cohort.
Conclusions Compared with registry 1, the management of the registry 2 cohort resulted in lower 5-year morbid event rates and reduced CABG operations. Mortality rates remained similar. When symptomatic status was considered in combination with events, a significantly better outcome was seen overall and in the initially successful cohort. In registry 2, repeated PTCA was used with much greater frequency early after the initial procedure.
Key Words: angioplasty • registries • follow-up studies
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