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Abstract
123I-metaiodobenzylguanidine (MIBG) cardiac scintigraphy was performed to assess cardiac autonomic dysfunction and demonstrate its correlation with clinical and polysomnographic characteristics in patients with isolated rapid eye movement (REM) sleep behavior disorder. All subjects including 39 patients with isolated REM sleep behavior disorder and 17 healthy controls underwent MIBG cardiac scintigraphy for cardiac autonomic dysfunction assessment. The isolated REM sleep behavior disorder was confirmed by in-lab overnight polysomnography. A receiver operating curve was constructed to determine the cut-off value of the early and delayed heart-to-mediastinum ratio in patients with isolated REM sleep behavior disorder. Based on each cut-off value, a comparison analysis of REM sleep without atonia was performed by dividing isolated REM sleep behavior disorder patients into two groups. MIBG uptake below the cut-off value was associated with higher REM sleep without atonia. The lower heart-to-mediastinum ratio had significantly higher REM sleep without atonia (%), both with cut-off values of early (11.0 ± 5.6 vs. 29.3 ± 23.2%, p = 0.018) and delayed heart-to-mediastinum ratio (9.1 ± 4.3 vs. 30.0 ± 22.9%, p = 0.011). These findings indicate that reduced MIBG uptake is associated with higher REM sleep without atonia in isolated REM sleep behavior disorder.

Affiliations

Sooyeoun You  1 , Kyoung Sook Won  2 , Keun Tae Kim  1 , Hyang Woon Lee  3 , Yong Won Cho  1
1 Department of Neurology, Keimyung University School of Medicine, Daegu 42601, Korea.
2 Department of Nuclear Medicine, Keimyung University School of Medicine, Daegu 42601, Korea.
3 Departments of Neurology, Medical Science, Computational Medicine, System Health Science & Engineering, Ewha Womans University School of Medicine and Ewha Medical Research Institute, Seoul 07985, Korea.