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[Patency of the artery responsible for myocardial infarction: role on ventricular function and long-term outcome]
J J Blanc1, B Salaun, J Mansourati
1Services de cardiologie, hôpital Morvan, Brest.
Insights
Maintaining a patent artery after myocardial infarction improves heart function and long-term prognosis. This study found better left ventricular function and fewer cardiac events in patients with a continuously open artery.
Area of Science:
- Cardiology
- Cardiovascular Medicine
- Interventional Cardiology
Context:
- Myocardial infarction (MI) is a leading cause of death globally.
- Left ventricular function is a key determinant of prognosis after MI.
- The role of coronary artery patency post-MI requires further investigation.
Purpose:
- To investigate the association between the patency of the infarct-related artery and long-term outcomes after myocardial infarction.
- To compare left ventricular function and clinical events in patients with patent versus non-patent infarct-related arteries.
Summary:
- A study of 240 patients with recent myocardial infarction and single-vessel disease found that maintaining patency of the infarct-related artery was associated with significantly higher left ventricular ejection fraction.
- Patients with a patent artery (Group I) showed better ventricular function and a trend towards improved long-term prognosis, with no cardiac deaths or ventricular tachycardia observed.
- Conversely, patients with a non-patent artery (Group II) exhibited greater left ventricular volumes and experienced cardiac deaths and ventricular tachycardia, indicating poorer outcomes.
Impact:
- These findings suggest that preserving or restoring infarct-related artery patency may be crucial for improving left ventricular function and long-term survival after myocardial infarction.
- The results highlight the importance of assessing and managing coronary artery patency in the long-term care of MI patients.
- This research could inform clinical guidelines and treatment strategies aimed at optimizing recovery and reducing adverse events post-MI.
Abstract:
Out of 3,171 consecutive patients referred for coronary angiography, 240 were selected on the following criteria: recent primary myocardial infarction, single vessel coronary disease, no angioplasty or coronary surgery after the angiography which was performed 20 to 90 days after the onset of myocardial infarction. The patients were divided into 2 groups according to whether the artery responsible for infarction was patent (Group I: 115 patients) or not (Group II: 125 patients). The left ventricular ejection fraction was significantly higher in Group I (58 +/- 10.8%) than in Group II (53.7 +/- 11.3%) and end systolic and end diastolic left ventricular volumes were greater in Group II (51.8 +/- 22 ml/m2 and 88 +/- 22 ml/m2 respectively). Long-term follow-up (56 +/- 25 months in Group I and 61 +/- 26 months in Group II) was possible in 112 patients in Group I and 123 patients in Group II. Of the 7 patients who died in group II, 4 deaths were of cardiac origin; in addition, 2 cases of sustained ventricular tachycardia were observed in this group. None of the 6 deaths observed in Group I was of cardiac origin and there were no cases of ventricular tachycardia (p = 0.05). The functional status was identical in the two groups at the end of the study. These results suggest that the patency of the coronary artery responsible for myocardial infarction at a distance from the acute event is associated with better left ventricular function and a better long term prognosis.