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Table 6 NCS findings in ulnar neuropathy at elbow

From: A retrospective study of electrodiagnostically evaluated ulnar neuropathies with special guidelines for ulnar neuropathies at elbow

Parameters Etiology Abnormal
Ulnar motor nerve conduction velocity across elbow < 50 m/s T 16 (66.67%)
NT 120 (82.75%)
motor conduction velocity difference between forearm and elbow segment > 11 m/s T 15 (62.5%)
NT 98 (67.58)
CMAP amplitude > 50% drop across elbow T 13 (54.16%)
NT 80 (55.17%)
CMAP amplitude > 20% drop across elbow at 10 cm difference T 10 (41.67%)
NT 80 (55.17)
Inching technique: > 10% CMAP amplitude drop and/or abrupt shift in latency by 8 cm on Short-segment (2 cm) stimulations T 6 (24%)
NT 50 (34.48%)
SNCV below 50 m/s across elbow T 14 (58.33%)
NT 100 (68.96%)
reduction in SNAP base-to-peak amplitude by 43% or > 8 µV T 4 (16.7%)
NT 70 (48.27%)
Abnormal Dorsal ulnar cutaneous nerve (DUCN) SNAP and conduction velocity T 3 (12.5%)
NT 60 (41.37%)