Sex differences in patients with MINOCA: baseline characteristics and prognosis

Abstract

Abstract Background The difference between men and women regarding the diagnosis and treatment of cardiovascular diseases has been an object of study during the last few years, with an underrepresentation of female patients in old studies. The epidemiology, diagnosis, and treatment of patients with myocardial infarction with non-obstructive coronary arteries (MINOCA) has not yet been wholly elucidated up to this day. The aim of this study is to compare the characteristics and prognosis of MINOCA patients based on sex. Methods We analyzed all consecutive patients with MINOCA diagnosed at a University Hospital between 2016 and 2022. MINOCA diagnostic criteria compelled at the ESC Clinical Guidelines and the AHA Scientific Statement have been followed. Results Our sample comprises 107 patients with MINOCA, 61 male (57%) and 46 female (43%), but once the age of 80 years old was reached, MINOCA was more prevalent in women. We found the female population to have a higher prevalence of stress (usually chronic stress) and transient ischaemic attacks. On the contrary, men usually have more night shifts, psychiatric disorders, and a higher prevalence of smoking. We found no significant differences in cardiovascular risk factors (hypertension, dyslipidemia, or DM), clinical presentation, or other symptoms at admission. (Table 1). High-sensitivity troponin peak concentration was higher in women. As for the main MINOCA physiological mechanisms, we found a significantly higher prevalence of vasospasm in men and coronary artery dissection in women. There were no significant differences regarding coronary embolism, type II acute myocardial infarction (AMI), plaque rupture, or unknown mechanisms. Regarding prognosis, with a median follow-up of 45 [20-65] months, no significant differences were found between both groups for the development of in-hospital complications or mortality, nor cardiovascular readmissions, reinfarction or death from any cause (Table 2). Conclusion Unlike the previous popular perception of this disease, there are more MINOCA male patients than females in our sample, and psychiatric disorders are more prevalent in men. In octogenary people, MINOCA was more prevalent in women. At admission, symptoms and electrocardiographic parameters were very similar between both groups, while cardiac biomarkers reached higher levels in women, unrelated to coronary artery extension or the severity of left ventricular dysfunction.