The utility of a novel composite parameter in sensory nerve conduction studies: Amplitude/rise time of sensory nerve action potential [Duyusal sinir ileti çali{dotless}şmalari{dotless}nda yeni bir bileşik parametrenin kullani{dotless}mi{dotless}: Duyusal sinir aksiyon potansiyelinde amplitüd/ yükselme zamani{dotless}]

Objective: to evaluate the new composite parameter (i.e.,the ratio of amplitude to rise time) of sensory nerve action potential in patients with diabetic distal symmetric sensory polyneuropathy (dssp). methods: 82 diabetic patients (two subgroups of normal and deteriorated ncs) and 34 controls were evaluated based on nerve conduction studies (ncs),rise time and the ratio of amplitude to rise time (a/rt). results: the a/rt (cut off value = 1) of medial plantar,sural (su) and superficial peroneal nerves were quite informative in each group (p < 0.0001,for relevant nerves). however,sua/rt was more reliable and useful than other nerves based on specifity and predictive values. conclusions: evaluation of su-a/rt as an additional parameter would increase the diagnostic utility of ncs in detecting dssp.