Gregor Omejec1, Simon Podnar. 1. Institute of Clinical Neurophysiology, Division of Neurology, University Medical Center, SI-1525, Ljubljana, Slovenia.
Abstract
INTRODUCTION: In patients with ulnar neuropathy at the elbow (UNE), short-segment nerve conduction studies (NCS) are rarely performed due to unclear reference values. We excluded controls with subclinical UNE, calculated normative values, and tested them in UNE patients. METHODS: Clinical examination, ultrasonography (US), and 2-cm short-segment ulnar motor NCS across the elbow were performed in 49 controls and 67 UNE patients. In controls, subclinical UNE was diagnosed if at least 2 studies were outside the reference limits in the same 2-cm segment. RESULTS: Exclusion of controls with subclinical UNE produced less stringent normative values (2-cm conduction velocity: 25 to 31 m/s; US cross-sectional area: 11.6 to 9.6 mm2), which raised diagnostic sensitivity (short-segment NCS: 76% to 90%; 10-cm NCS: 72% to 85%, US: 43% to 79%). CONCLUSIONS: We propose the use of our normative values in patients with clinically definite and probable UNE after exclusion of alternative diagnoses.
RCT Entities:
INTRODUCTION: In patients with ulnar neuropathy at the elbow (UNE), short-segment nerve conduction studies (NCS) are rarely performed due to unclear reference values. We excluded controls with subclinical UNE, calculated normative values, and tested them in UNE patients. METHODS: Clinical examination, ultrasonography (US), and 2-cm short-segment ulnar motor NCS across the elbow were performed in 49 controls and 67 UNE patients. In controls, subclinical UNE was diagnosed if at least 2 studies were outside the reference limits in the same 2-cm segment. RESULTS: Exclusion of controls with subclinical UNE produced less stringent normative values (2-cm conduction velocity: 25 to 31 m/s; US cross-sectional area: 11.6 to 9.6 mm2), which raised diagnostic sensitivity (short-segment NCS: 76% to 90%; 10-cm NCS: 72% to 85%, US: 43% to 79%). CONCLUSIONS: We propose the use of our normative values in patients with clinically definite and probable UNE after exclusion of alternative diagnoses.
Authors: Kamal Mezian; Jakub Jačisko; Radek Kaiser; Stanislav Machač; Petra Steyerová; Karolína Sobotová; Yvona Angerová; Ondřej Naňka Journal: Front Neurol Date: 2021-05-14 Impact factor: 4.003