Characteristics and demographics of reversible cerebral vasoconstriction syndrome: A large prospective series of Korean patients.

Objectives To report demographics and characteristics of reversible cerebral vasoconstriction syndrome (RCVS) in the Korean cohort. Methods We prospectively recruited patients with definite (imaging-proven) RCVS and probable (imaging-negative) RCVS who visited Samsung Medical Center between June 2012 and September 2016. Clinical manifestations, neuroimaging, treatment, and clinical outcomes were evaluated in all patients. Characteristics of RCVS without typical causes ("idiopathic RCVS") were compared with those of RCVS with identifiable causes ("secondary RCVS"). International Classification of Headache Disorders (ICHD)-3 beta criteria for 6.7.3 RCVS and 6.7.3.1 probable RCVS were tested. Results A total of 138 patients (104 definite and 34 probable RCVS) were included in this study. Patients with definite RCVS were predominantly female (85.6%) and middle-aged (mean, 50.7 [range, 23-82] years). Probable RCVS was associated with less female predominance (70.6%, p = 0.049), more typical manifestations ( p < 0.001), and none of neurological complications. One-hundred and one (97.1%) patients with definite RCVS had headache, but the typical "recurrent and/or triggered" thunderclap headache was reported in only 83 (82.2%). In most patients with definite RCVS (84.6%), RCVS was idiopathic, while only 16 (15.4%) had secondary causes. Compared to those with secondary RCVS, patients with idiopathic RCVS were older (52.8 ± 11.42 vs. 39.1 ± 9.55 years, p < 0.001). Patients with secondary RCVS had more complications than those with idiopathic RCVS (40.5% vs. 12.5%, p = 0.018). Among idiopathic RCVS patients, 33 (37.5%) reported a preceding event or a change in lifestyle, environment, health, or medication within one month before onset. Conclusion In our cohort, RCVS was benign and idiopathic in most patients, and occurred frequently in middle-aged women. Manifestations of RCVS were more diverse than previously recognized, and forms without any headache existed. Different genetic, social, and environmental factors should be taken into account to unveil the spectrum and pathophysiology of RCVS.