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Percutaneous transluminal coronary angioplasty: role of the surgeon
Insights
Percutaneous transluminal coronary angioplasty (PTCA) offers initial success in 87% of patients, but failure can lead to higher rates of new Q-waves and increased medication use compared to coronary artery bypass surgery. Expedient revascularization minimizes PTCA failure complications.
Area of Science:
- Cardiology
- Interventional Cardiology
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) and coronary artery bypass surgery (CABG) are key revascularization strategies.
- Patient selection and outcomes comparison are crucial for optimizing treatment pathways.
Purpose of the Study:
- To compare the outcomes of PTCA versus isolated CABG in patients with coronary artery disease.
- To evaluate the incidence and consequences of PTCA failure.
Main Methods:
- A comparative study of 339 patients undergoing PTCA and 338 patients undergoing isolated CABG over one year.
- Analysis of procedural success rates, failure modes, and clinical outcomes including myocardial infarction and arrhythmias.
Main Results:
- PTCA showed initial success in 87% of patients, with favorable baseline characteristics (less angina, fewer prior MIs, better LV function).
- PTCA failure, particularly early failure, was associated with a higher incidence of new Q-waves (18% vs. 3.6% for CABG) and increased use of inotropic agents and antiarrhythmics.
- Dissection of an atheromatous plaque was the primary finding in failed PTCA cases requiring urgent revascularization.
Conclusions:
- While PTCA is initially successful for many, failure necessitates careful management and can lead to significant adverse events.
- Prompt revascularization following PTCA failure is critical for mitigating morbidity and mortality.
- The study highlights the importance of available resources for immediate intervention in cases of PTCA failure.
Abstract:
Over a recent one-year period, 339 patients underwent percutaneous transluminal coronary angioplasty (PTCA) and were compared with 338 patients having isolated coronary artery bypass surgery. Patients undergoing PTCA had a shorter duration of angina, a lower number of prior myocardial infarctions, and better left ventricular function (p less than 0.01); PTCA was considered initially successful in 87% (295/339) of patients. Repeat angioplasty was performed in 18% of patients (34/339), with a successful outcome in all but 1. The most common finding at operation in those with failed angioplasty and urgent or emergency revascularization was dissection of an atheromatous plaque. There were 28 early failures (operation performed within 24 hours) and 24 late failures (operation at more than 24 hours), for early and late failure rates of 8.3% and 7.1%, respectively. Although the cumulative frequency of new Q-waves in the entire angioplasty series was low (2.7%), the incidence was high in those with angioplasty failure and subsequent operation (18%), and was significantly greater than in patients having elective coronary bypass (3.6%). Use of inotropic agents and lidocaine treatment for ventricular arrhythmias was also significantly higher in patients with unsuccessful PTCA who required operation than in those undergoing elective bypass (10% versus 3% and 10% versus 1.5%, respectively; p less than 0.01). Eleven of the 28 patients who were early failures were totally revascularized within 2 hours of angioplasty failure. Facilities and staff available for expedient revascularization accounted for the low morbidity and lack of mortality in PTCA failures.