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Reliability of pudendal nerve terminal motor latency
T Tetzschner1, M Sørensen, O O Rasmussen
1Department of Obstetrics and Gynecology, Glostrup Country Hospital, University of Copenhagen, Denmark.
Aim:
To evaluate reliability of Pudendal Nerve Terminal Motor Latency (PNTML).
Methods:
Forty healthy subjects, 24 women and 16 men, and eight female patients were included. Four patients had idiopathic faecal incontinence and 4 an anal sphincter rupture after child-birth. PNTML measurement was performed by two observers with the patient in left lateral and supine position. Examinations were repeated on another day to evaluate intraindividual reproducibility.
Results:
Interobserver reproducibility was 92%-116% for PNTML. Degree of agreement for PNTML between left lateral and supine position was 86%-111%. Intra-individual reproducibility in the supine and left lateral positions was 89%-109% and 88%-113% respectively. Normal values for mean PNTML were higher in women compared with men, 1.91 msec (2 SD, 0.52 msec) and 1.74 msec (2 SD, 0.33 msec) respectively, t = 2.44, 37 DF, P < 0.01.
Conclusions:
Reliability of PNTML in terms of interobserver and intraindividual reproducibility was high. Women had higher normal values for PNTML than men.