Atrial Septal Aneurysm may Cause In-Hospital Recurrence of Cryptogenic Stroke.

AIMS Awareness of potentially embologenic diseases is critical to determining the prognosis of cryptogenic stroke. The clinical significance of atrial septal aneurysm (ASA) in cryptogenic stroke has not been fully studied. Therefore, we explored clinical characteristics and in-hospital recurrence in patients with ASA in cryptogenic stroke. METHODS A multicenter observational registry of cryptogenic stroke patients was conducted. We obtained baseline characteristics, radiological and laboratory findings, and echocardiographic findings, especially of embolic sources on transesophageal echocardiography. The CHALLENGE ESUS/CS (Mechanisms of Embolic Stroke Clarified by Transesophageal Echocardiography for embolic stroke of undetermined source/cryptogenic stroke) registry was recorded at http://www.umin.ac.jp/ctr/ (UMIN000032957). Patients' clinical characteristics were compared according to the presence of ASA, and factors associated with in-hospital stroke recurrence were assessed. RESULTS The study included 671 patients (age, 68.7±12.7 years; 450 males; median National Institutes of Health Stroke Scale score, 2). ASA was detected in 92 patients (14%), displaying higher age (72.4±11.0 vs. 68.1±12.9 years, p=0.004), reduced frequency of diabetes mellitus (16% vs. 27%, p=0.030), higher frequency of right-to-left shunt (66% vs. 45%, p＜0.001), and in-hospital stroke recurrence (8% vs. 3%, p=0.034). ASA was relatively associated with in-hospital recurrence (odds ratio 2.497, 95% confidence interval 0.959-6.500, p= 0.061). CONCLUSIONS The CHALLENGE ESUS/CS registry indicated that ASA was not rare in cryptogenic stroke, and ASA's clinical characteristics included higher age, reduced frequency of diabetes mellitus, and increased frequency of concomitant right-to-left shunt. ASA may be related to in-hospital stroke recurrence in cryptogenic stroke.