Abstract:

Objective To investigate the incidence of myocardial infraction in patients with chronic total coronary occlusion, and explore its relationship with collateral vessels. Methods The medical history, myocardial enzyme and electrocardiogram in 256 patients with chronic total coronary occlusion(occlusion duration ≥3 months) were retrospectively analysed. Patients were divided into myocardial infarction group and non-infarction group, and the basic characteristics, drug therapies, distribution and extent of occluded blood vessels, lesion distribution and severity of unoccluded vessels and the collateral vessel grade of Rentrop classification on coronary artery angiogram were compared between groups. Results There were 138 (53.9%) patients in myocardial infraction group and 118 (46.1%) patients in non-infarction group. There was no significant difference between two groups in age, gender, diabetes, hypertension, hyperlipidemia, smoking history and drug therapies (P>0.05). There was no significant difference in the distribution and extent of occluded blood vessels between two groups (P>0.05). Similarly, there was no significant difference in the lesion distribution and severity of unoccluded vessels between two groups (P>0.05). Besides, there was no significant difference in the collateral grade between two groups (P>0.05). Conclusion When chronic total coronary occlusion lasts for more than 3 months, there may be no difference in the grade of collateral vessels regardless of the incidence of myocardial infraction of myocardium supplied by the occluded artery.

Key words: chronic total coronary occlusion, myocardial infraction, collateral vessel