Related Experiment Videos
[Total obstruction of the anterior interventricular artery without myocardial infarction]
Insights
Anterior interventricular artery occlusion without myocardial necrosis is linked to unstable angina and specific ECG changes. These cases may mimic "phantom artery syndrome" and require careful diagnosis.
Area of Science:
- Cardiology
- Interventional Cardiology
Context:
- Investigating factors influencing myocardial necrosis development after anterior interventricular artery occlusion.
- Comparing clinical, electrocardiographic, hemodynamic, and angiographic criteria between patients with and without transmural myocardial necrosis.
Purpose:
- To identify determinants of permanent myocardial necrosis in cases of complete proximal anterior interventricular artery occlusion.
- To differentiate between "phantom AIV artery syndrome" and unstable angina based on clinical and ECG profiles.
Summary:
- Group B (no necrosis) predominantly presented with unstable angina (<2 months duration), ventricular repolarization abnormalities (V3-V5 leads), and moderate anteroapical hypokinesis.
- Angiographic findings in Group B included better distal anterior interventricular artery visualization and increased instances of homocoronary and heterocoronary re-perfusion.
- Despite re-perfusion, surgical candidacy was limited in Group B (39%), highlighting diagnostic challenges.
Impact:
- Findings suggest that clinical and ECG profiles in Group B can be indistinguishable from unstable angina.
- This research aids in understanding the nuances of anterior interventricular artery occlusion and its association with myocardial necrosis.
- Improved diagnostic criteria can lead to better patient management and treatment strategies for coronary artery disease.
Abstract:
Complete proximal occlusion of the the anterior interventricular artery was associated with the presence (group A: 31 cases) or the absence (group B: 31 cases) of transmural myocardial necrosis in the corresponding territory. The aim of this study was to define the factors which determine the development of permanent myocardial necrosis, on the basis of clinical, electrocardiographic, haemodynamic and angiographic criteria. Group B was characterised by the following features: almost all of the patients (30 out of 31) had unstable angina, for less than 2 months in half of the cases; 67% of cases presented an abnormality of ventricular repolarisation on the resting ECG, usually (54 per cent of cases) in leads V3 to V5, suggestive of isolated sub-pericardial ischaemia in half of these cases; 24 cases presented moderate regional hypokinesia in the anteroapical territory of the LV; the distal AIV artery was more clearly visualised (17 cases had a well perfused AIV artery compared with 6 in group A) and a greater number of patients obtained homocoronary interseptal re-perfusion (8 versus 2) and heterocoronary re-perfusion by distal anastomosis of the AIV artery and the PIV artery by the apex (13 versus 3) (p less than 0.05) than in group A. However, the possibility of surgery was considered to be limited (39%) on the basis of the angiographic criteria. Thus, in group B, a "phantom AIV artery syndrome" can not be distinguished from unstable angina on the basis of the clinical and electrocardiographic profile.(ABSTRACT TRUNCATED AT 250 WORDS)