Atrial cardiomyopathy in patients with cryptogenic embolic stroke: incidence, instrumental diagnostic features, impact on prognosis

Abstract

Latent atrial fibrillation (AF), whose substrate is atrial cardiomyopathy (AC), is considered the main potential pathogenetic mechanism of cryptogenic embolic stroke (CES). Early detection of AC allows to intensify the search for AF in such patients.Objective: to compare the characteristics of patients with CES in terms of clinical and anamnestic data, echocardiographic parameters, MRI patterns of infarction foci and disease outcomes depending on the presence of the major markers for AC.Material and methods. We studied 103 patients in the acute phase of CES with a lesion confirmed by MRI data, who were divided into two groups according to the presence (n=17) or absence (n=86) of AC. A comprehensive clinical, laboratory, and instrumental examination was performed and long-term outcomes were assessed. The median follow-up period was 32 months.Results. The incidence of AC in the CES population was 17%; the most common markers were an increase in left atrial volume index and paroxysms of supraventricular tachycardia. Patients with AC-CES were characterised by older age and a two-fold increase in the prevalence of coronary heart disease. Patients with AC-CES were nine times more likely to have a "black artery" symptom on MRI than patients without AC. The predictive accuracy of this clinical pattern was 84%, the sensitivity was 60% and the specificity was 86%. Patients with AC-CES had a significantly higher risk (odds ratio 3.4; 95% confidence interval 1.1–9.9; p=0.023) for a composite outcome that included the development of recurrent ischemic stroke, transient ischemic attack, myocardial infarction or death.Conclusion. AC diagnosed by a combination of echocardiographic and electrocardiographic signs is present in 17% of patients with CES. Patients with AC-CES are characterised by elderly age, the presence of atherosclerosis-associated disease, a specific MRI pattern (the “black artery” symptom) and an unfavourable prognosis during the 2.5-year follow-up period.