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Causes of coronary events after successful coronary angioplasty
S Ishiwata1, S Nakanishi, S Nishiyama
1Cardiovascular Centre, Toranomon Hospital, Tokyo, Japan.
Insights
Fatal cardiac events after coronary angioplasty are rare. Most events in patients without restenosis stem from new lesions, not the treated site, necessitating long-term follow-up.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Coronary angioplasty is a common procedure for treating coronary artery disease.
- Understanding late cardiac events after successful angioplasty is crucial for patient management.
Purpose of the Study:
- To identify the causes and incidence of coronary events following successful coronary angioplasty.
- To differentiate event origins in patients with and without early restenosis.
Main Methods:
- Retrospective analysis of follow-up angiograms in 60 patients with coronary events after successful elective angioplasty.
- Exclusion of patients who underwent angioplasty to bypass grafts.
- Categorization of events based on restenosis and lesion location.
Main Results:
- No fatal events occurred within 6 months post-angioplasty; 10 occurred later.
- Early restenosis (mean 3.9 months) led to non-Q-wave infarction at the dilated site.
- In patients without early restenosis, events originated from new, distant lesions, not the treated site.
- Long-term patency (41 months) was good in 96% of patients without early restenosis.
Conclusions:
- Fatal events due to early restenosis are infrequent.
- Long-term patency of the dilated site is generally maintained.
- Cardiac events in patients without early restenosis often arise from new lesions, underscoring the need for vigilant long-term monitoring.
Objective:
To determine the causes and incidence of coronary events after successful coronary angioplasty.
Methods:
We evaluated retrospectively follow-up angiograms of 60 patients with coronary events (27 with myocardial infarction, 33 with new-onset angina pectoris) from among 930 consecutive patients who underwent successful elective angioplasty between February 1985 and April 1994. Patients who had undergone percutaneous transluminal coronary angioplasty to bypass grafts were excluded.
Results:
No fatal cardiac events occurred within 6 months of percutaneous transluminal angioplasty; 10 occurred thereafter. Fifteen patients who developed early (3.9 +/- 1.8 months) restenosis showed non-Q-wave infarction resulting from severe restenosis at the previously dilated site. In patients without early restenosis, cardiac events developed not from the previously dilated site, but from previously undilated, non-obstructive sites. Furthermore, it was found that the patency of the previously dilated site remained good for a long period of time (41 +/- 23 months) in 96% (43 of 45) of these patients. These findings indicate that the vast majority of cardiac events in patients without early restenosis resulted from new lesions distant from the previous angioplasty site.
Conclusions:
Fatal cardiac events resulting from early restenosis were rare. In patients with no evidence of restenosis, long-term patency remained good. However, a proportion of these patients developed cardiac events resulting from lesions distant from the previous angioplasty site and hence careful long-term follow-up is essential.