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Objective To investigate the clinical and electrophysiological characterization of spinal muscular atrophy (SMA) in childhood type.Methods A total of 25 cases of patients with SMA definitely diagnosed were recruited by using deletion analysis of SMN1 exon 7 and 8.Among these cases, 4 cases were type Ⅰ, 13 cases were type Ⅱ and another 8 cases are type Ⅲ.All of the 25 cases of patients undenwent both the measurement of sensor and motor nerve conduction studies (NCS) and electromyography (EMG).