Electrophysiological study and grades
The patients diagnosed with mild-to-moderate CTS based on the electrophysiological severity grade by Padua et al20-22 : mild: normal distal motor latency (DML) with abnormal digit/wrist sensory nerve conduction velocity (SNCV); moderate: both digit/wrist SNCV and DML were abnormal; severe: SNCV was absent and DML was abnormal.