Neurophysiological study of the radial nerve variant in the innervation of the dorsomedial surface of the hand.

INTRODUCTION: Sensory innervation of the dorsomedial surface of the hand usually depends on the dorsal ulnar nerve (DUN). Innervation in this area by the superficial radial nerve (SRN) has been described as a normal variant. METHODS: We studied 358 patients using nerve conduction of the DUN and SRN with dorsomedial recording. Each hand was classified into usual innervation (only DUN response), mixed variant (response of both nerves), or complete variant (only SRN response). RESULTS: Mixed innervation was found in 14.2% of hands and complete innervation was found in 6.8% of hands, mostly unilaterally. No statistically significant differences were observed in age, sex, or clinical suspicion between usual and variant innervation. The potential amplitude after SRN stimulation was greater in the complete variant. DISCUSSION: It is important to know the characteristics of this variant in order to avoid diagnostic errors and to prevent iatrogenic lesions in surgery performed on the dorsum of the wrist. Muscle Nerve 58: 732-735, 2018.

¿Es el síndrome de apnea-hipoanea durante el sueño (SAHS) un factor de riesgo de enfermedad neurodegenerativa en el trastorno de conducta en sueño REM (RBD)? / No disponible

Introducción: Estudios epidemiológicos han observado una elevada prevalencia del RBD y SAHS en el anciano. El RBD se clasifica como idiopático y asociado a enfermedades neurodegenerativas. La presencia de SAHS en el RBD es frecuente (34-61 %), aunque parece que su gravedad es menor. Iranzo y Santamaría identificaron un subgrupo de pacientes con “pseudo-RBD”, que eran pacientes con SAHS severo exclusivamente. Objetivo: Determinar la prevalencia de SAHS en una muestra de pacientes que cumplen criterios clínicos y vídeo-PSG de RBD y cuantificar el riesgo de desarrollar una enfermedad neurodegenerativa. Material y métodos: 38 pacientes con diagnóstico de RBD y seguimiento durante varios años. Se observó que un 41,2% desarrollaron procesos neurodegenerativos. El diagnóstico de RBD y SAHS se realizó mediante vídeo-PSG. La cobertura estadística: 89,5% (34/38). El 68,4% hombres con edad media de 62,9 años. La prevalencia de SAHS fue del 64,7 %, del 55% en el grupo RBD idiopático frente al 78,5% en el grupo que desarrolló una enfermedad neurodegenerativa. Para llevar a cabo el análisis de los paciente se realizó un estudio observacional, cohorte. La implicación del SAHS se estudió mediante el Riesgo Relativo (RR). Definición de caso: persona con diagnóstico de RBD y SAHS que desarrolla una enfermedad neurodegenerativa. Resultados: Se obtuvo un RR del 2, con un IC del 95% (0,69-5,75), estadísticamente no significativo. Discusión y Conclusiones: En nuestra muestra se demostró una prevalencia y características del RBD congruentes con la literatura. La investigación no permitió demostrar una asociación estadísticamente significativa (AU)

Introduction: Epidemiological studies have observed a high prevalence of RBD and SAHS among the elderly. RBD qualifies as idiophatic and is associated with neurodegenerative diseases. Presence of SAHS in RBD is frequent (34-61 %), though it seems that its seriousness is minor. Iranzo and Santamaría identified a patient’s subgroup with "pseudo-RBD", who exclusively had severe SAHS. Our goal is to determine SAHS prevalence in a patients sample that meet the clinical criteria and RBD video-PSG, and on the other hand to quantify the risk of developing a neurodegenerative disease. Material and methods: 38 patients with RBD diagnosis and follow-up during a few years.We observed that 41.2% developed neurodegenerative diseases. Diagnosis of RBD and SAHS was performed by video-PSG. Statistical coverage: 89.5% (34/38). 68.4% men with mean age of 62.9 years. SAHS prevalence was 64.7 %, 55% for RBD idiophatic group, against 78.5% for the group that developed a neurodegenerative disease. To carry out the analysis, an observational cohort study was performed. Implication of SAHS was analyzed by means of Relative Risk (RR). Definition of case: it presents with diagnosis of RBD and SAHS that develops a neurodegenerative disease. Results: RR of 2 was obtained, with an IC of 95% (0.69-5.75), statistically not significant. Discussion and Conclusions:In our sample, RBD prevalence and characteristics were consistent with literature. Research did not allow proving a statistically significant association (AU)