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Slow coronary flow complicating elective balloon angioplasty in postthrombolytic patients
1Michigan Heart and Vascular Institute, St. Joseph Mercy Hospital, Ann Arbor.
Insights
Reduced coronary blood flow after percutaneous transluminal coronary angioplasty (PTCA) can occur unexpectedly. This may be due to potent vasoconstrictors or microparticle embolization, leading to myocardial ischemia.
Area of Science:
- Cardiology
- Interventional Cardiology
Background:
- Coronary blood flow is typically brisk after percutaneous transluminal coronary angioplasty (PTCA).
- Reduced coronary blood flow post-PTCA, without dissection, air embolism, or spasm, is unusual and poorly understood.
Observation:
- Four patients experienced reduced coronary flow after PTCA despite no signs of dissection, air embolism, or spasm.
- These patients had recent thrombolytic therapy for acute myocardial infarction.
- Reduced flow persisted despite aspirin, heparin, and vasodilator pretreatment.
Findings:
- Patients developed symptoms of myocardial ischemia, including necrosis, heart block, and cardiac rupture.
- Intracoronary nitroglycerin and thrombolytic agents did not rapidly reverse the slow flow.
- PTCA of recently lysed or thrombotic arteries may activate vasoconstrictors or cause distal embolization.
Implications:
- This syndrome highlights a potential complication of PTCA in specific patient populations.
- Understanding the mechanism is crucial for managing post-PTCA complications.
- Further research is needed to elucidate the precise pathways involved in slow-flow phenomenon post-PTCA.
Background:
Coronary blood flow after percutaneous transluminal coronary angioplasty (PTCA), as judged by the clearance of contrast media from the arterial bed, is usually brisk. Reduced coronary blood flow after PTCA in the absence of arterial dissection, air embolism, and large vessel spasm is unusual and the mechanism that causes it is incompletely understood.
Methods:
All cases of reduced coronary blood flow after PTCA during a 12-month period were identified from a prospective database. Clinical, procedural, and angiographic findings were reviewed.
Results:
Four patients demonstrated reduced coronary flow after PTCA in the absence of intimal dissection, air embolism, or large vessel spasm. All of the patients had been treated several days earlier with thrombolytic agents for acute myocardial infarction. The reduced coronary flow developed despite pretreatment with aspirin, heparin, and vasodilators. Symptoms of myocardial ischemia developed in each patient, including myocardial necrosis in three patients, complete heart block in one, and delayed cardiac rupture in one. This syndrome was not rapidly reversed with intracoronary nitroglycerin and thrombolytic agents.
Conclusions:
Percutaneous transluminal coronary angioplasty of recently lysed or freshly thrombotic coronary arteries may predispose to the activation of potent vasoconstrictors or distal embolization of microparticulate atherothrombotic debris, leading to slow coronary flow and myocardial ischemia.