Acute Complications in Patients with Myocardial Infarction with Non-Obstructive Coronary Arteries: A Systematic Review with Special Focus on Mechanical Complications.

ABSTRACT

Background: Recently, we have observed an increasing focus on myocardial infarction (MI) with non-obstructive coronary arteries (MINOCA) patients. MINOCA incidence is estimated to be within the range of 5-15% of all MI cases. Unfortunately, MINOCA relates to various conditions that are not rarely hard to identify, including coronary microcirculation dysfunction, epicardial coronary spasm, or plaque erosion. Our systematic review aimed to identify and appraise previous studies which characterized acute complications, with particular focus on mechanical complications, in patients with MINOCA. Methods: Applying the MeSH strategy in PubMed and Embase, two operators independently and systematically reviewed published studies on patients diagnosed with MINOCA and in whom acute complications were described. Papers published in the last 10 years (June 2012-June 2022) to reflect the introduction of the MINOCA definition as well as the current clinical practice were analyzed. The research was conducted in July 2022. Results: The search yielded 192 records. After abstract review, 79 papers were left, and after full-text analysis, we finally included 20 studies. Among 20 studies, there were one randomized controlled trial, one prospective study, five retrospective studies, 1 case series, and 12 case reports with a total number of 337,385 patients. In the identified literature, we revealed 7 cases of intraventricular septal rupture, 3 cases of free wall rupture with pericardial effusion or cardiac tamponade, and 3 cases of bleeding complications (intracerebral or intestinal bleeding). Moreover, the ventricular arrhythmia incidence ranged from 2% to 13.8%, and the in-hospital death rate ranged from 0.9% to 6.4%. Conclusions: These findings suggest that MINOCA patients should be treated as standard MI patients with watchful monitoring, especially in the first few days.