F-wave-duration in diabetic polyneuropathy.

The diagnostic sensitivity of F-wave duration (Fdur) in diabetic polyneuropathy was analyzed. Some patients had abnormal Fdur values with normal minimum F latencies (Fmin). The incidence of abnormality for tibial and peroneal Fdur was somewhat more common than for Fmin in cases of suspected mild or early phase polyneuropathy. Fdur may provide additional diagnostic information in certain cases, particularly those in which there is mild polyneuropathy.