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[Interventional therapy in unstable angina pectoris]
1Departement Medizin, Universitätsklinik Bern.
Insights
Unstable angina indicates a severe lesion but not the full extent of coronary artery disease. Early coronary angiography and potential percutaneous coronary angioplasty (PTCA) are crucial, balancing risks and benefits for optimal patient outcomes.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Medicine
Background:
- Unstable angina (UA) signifies a critical coronary artery lesion.
- UA severity does not correlate with the overall extent of coronary artery disease (CAD).
- Prompt diagnosis and intervention are key for managing UA.
Purpose of the Study:
- To evaluate the optimal timing and approach for coronary angiography and percutaneous coronary angioplasty (PTCA) in patients with unstable angina.
- To assess the risks and benefits associated with immediate versus delayed intervention.
- To explore strategies for managing complications, particularly acute occlusions and large thrombi.
Main Methods:
- Review of clinical presentations and outcomes in unstable angina patients.
- Analysis of periprocedural complication rates associated with PTCA.
- Consideration of adjunctive medical therapies (e.g., heparin, aspirin, fibrinolytic agents).
Main Results:
- Immediate PTCA may be suitable for lesions amenable to the procedure.
- Unstable plaques with thrombosis increase risks of periprocedural infarction, death, and bypass surgery.
- Pretreatment with heparin and aspirin may reduce PTCA complications.
- Preliminary anticoagulation or fibrinolysis can mitigate risks in cases with large thrombi.
Conclusions:
- The timing of coronary angiography and PTCA in unstable angina remains a subject of debate.
- Medical stabilization can be a viable strategy, potentially reducing acute complication rates.
- Delaying PTCA carries the risk of acute myocardial infarction, necessitating a careful balance of intervention timing.
Abstract:
The presence of unstable angina points to the severity of the culprit lesion, but it does not necessarily inform about the extent of coronary artery disease. Coronary angiography should be performed as soon as possible, with the exception of very old patients. If the lesion identified as the cause of unstable angina is amenable to coronary angioplasty (PTCA), the latter can be performed immediately. However, in patients with unstable angina due to an unstable plaque (fissured atheroma with partial thrombosis), acute occlusions occur more often than with routine PTCA, leading to higher perinterventional infarction and death rates and increased need for emergency bypass surgery. In cases with large intracoronary thrombi that are not completely occlusive, preliminary therapy with heparin for a few days or a fibrinolytic agent for a few hours may be wise to diminish the risk of acute vessel closure after PTCA. Sufficient clearing of the thrombus by these measures obviating the need for further interventions may occur occasionally. The point in time of coronary angiography and PTCA in unstable angina is controversial. Medical stabilization may be tried, and it appears that pretreatment with heparin and aspirin may decrease the high complication rate typical for PTCA in the acute phase. On the other hand, PTCA should not be postponed for too long, because of the risk of intercurrent infarction.