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Electromyogram of a patient with suspected slow-channel congenital syndrome. A) Representative example of a repetitive compound action potential on a patient with a suspected slow channel syndrome. B) On repetitive nerve stimulation at low frequency (3 Hz) it is possible to observe an abnormal decrement (17%) in the amplitude between the first and fifth elicited compound motor action potential. (Amplitude 1st potential = 2.37 mV; amplitude 5th potential = 1.96 mV; decrement of 17%).
