Abstract

The relationship between renal function and severity of cardioembolic stroke (CES) stratified by sex remains poorly understood. A total of 640 consecutive CES patients within 48 h after stroke onset and with a modified Rankin Scale (mRS) score of 0 or 1 before onset were studied. The patients were divided into three groups based on their CCr values: low creatinine clearance (CCr) (L-CCr) (n=71, <30 ml/min), middle CCr (M-CCr) (n=227, 30 to <50 ml/min), and high CCr (H-CCr) (n=342, ≥50 ml/min). We compared the severity and functional outcomes of stroke among the three groups according to sex. On admission, using the National Institutes of Health Stroke Scale, the L-CCr group had the most severe stroke, followed by the M-CCr and H-CCr groups (p<0.0001). Functional outcomes at discharge, assessed using the mRS, were the worst in the L-CCr group, followed by the M-CCr and H-CCr groups (p<0.0001). Multivariable analyses revealed that L-CCr was a significant determinant of severe stroke on admission and poor functional outcomes at discharge. According to sex, L-CCr was a significant determinant of severe stroke on admission and poor functional outcomes at discharge in female patients, but not in male patients. Low CCr is a risk factor for severe stroke on admission and unfavorable functional outcomes at discharge in Japanese CES patients, and particularly in female patients.

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