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Acute coronary thrombus formation after stress testing following percutaneous transluminal coronary angioplasty. A
Insights
Early stress testing after percutaneous transluminal coronary angioplasty (PTCA) may trigger late thrombus formation. Deferring functional testing for at least one month post-PTCA is recommended to allow for healing and prevent complications.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Biology
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) is a common procedure for treating coronary artery stenosis.
- Assessing the efficacy of PTCA typically involves stress testing.
- Late complications after successful PTCA, such as thrombus formation, require further investigation.
Observation:
- A 37-year-old male with unstable angina underwent successful PTCA for severe right coronary artery stenosis.
- Submaximal stress testing performed 3 days post-PTCA resulted in a positive test without ischemic symptoms, followed by acute myocardial infarction.
- Coronary arteriography revealed thrombus at the PTCA site, successfully treated with intracoronary streptokinase, uncovering residual stenosis.
Findings:
- This case highlights a rare instance of late thrombus formation following successful PTCA.
- The event occurred shortly after submaximal stress testing, suggesting a potential link between early functional assessment and thrombotic complications.
- The underlying mechanism may involve incomplete healing at the PTCA site, making it vulnerable to stress-induced thrombosis.
Implications:
- Early functional testing to assess PTCA efficacy may increase the risk of late adverse events.
- A recommended waiting period of at least one month post-PTCA is suggested before performing stress tests.
- This approach aims to allow for adequate healing of the coronary artery lesion and reduce the risk of post-procedural complications like myocardial infarction.
Abstract:
Successful percutaneous transluminal coronary angioplasty (PTCA) was performed on a 37-year-old white man with an isolated 95% right coronary artery stenosis who initially presented with type II unstable angina. Submaximal treadmill stress testing was not carried out before PTCA, but testing 3 days after PTCA was strongly positive without accompanying symptoms of myocardial ischaemia. Some 30 minutes after this test the patient experienced severe precordial pain with features of a hyperacute transmural inferior myocardial infarction. Immediate coronary arteriography delineated fresh thrombus related to the previous PTCA site. Intracoronary thrombolysis with streptokinase was successful, revealing an underlying severe stenosis at the PTCA site. PTCA was not repeated, nor was emergency coronary artery bypass grafting (CABG) performed. This is the second such case documented in the literature; the first patient failed to respond to intracoronary thrombolysis with streptokinase and was submitted to emergency CABG. The possible underlying pathophysiological mechanisms are discussed. We believe that the late thrombus formation was directly related to submaximal stress testing after successful PTCA, and recommend that testing to assess the efficacy of PTCA be deferred until at least 1 month after the procedure to allow for completion of the healing process.