The occluded coronary artery in the asymptomatic patient after myocardical infarction: should it be opened?

Area of Science:

• Cardiology
• Cardiovascular Medicine
• Interventional Cardiology

Background:

• The "open artery theory" posits survival benefits from opening occluded arteries post-myocardial infarction (MI) beyond myocardial salvage.
• Proposed mechanisms for this theory remain unproven.
• Knowledge is derived from spontaneous artery patency and ischemia-driven interventions.

Purpose of the Study:

• To review evidence for the "open artery theory" in asymptomatic patients post-MI.
• To evaluate if opening occluded arteries offers survival benefits beyond myocardial salvage.
• To assess the impact of infarct-related artery patency on patient outcomes.

Main Methods:

• Review of existing studies on spontaneous infarct-related artery patency.
• Analysis of outcomes from ischemia-driven interventions.
• Examination of large databases assessing the "open artery" effect.
• Reference to the ongoing Occluded Artery Trail comparing recanalization versus medical therapy.

Main Results:

• Survival advantage of a patent infarct-related artery appears limited to patients with left ventricular dysfunction or extensive infarctions.
• The largest database analysis did not find an independent association with survival one year post-MI.
• High rates of total occlusion, low recanalization success, and reocclusion challenge routine artery opening policies.

Conclusions:

• Routine opening of occluded arteries post-MI is not supported by current evidence due to limited benefits and procedural challenges.
• Further research, including trials like the Occluded Artery Trail, is needed to clarify the role of artery patency in specific patient subgroups.
• The "open artery theory" requires more robust evidence to justify widespread clinical application.