Sex differences in pudendal somatosensory evoked potentials

Area of Science:

• Neuroscience
• Neurophysiology
• Clinical Electrophysiology

Background:

• Pudendal nerve somatosensory evoked potentials (SEPs) are crucial for diagnosing pelvic floor disorders.
• Previous research has not fully established the impact of sex differences on SEP response latencies.
• This study aimed to standardize SEP procedures and investigate gender-specific effects on anal and penile/clitoral SEPs.

Purpose of the Study:

• To standardize the methodology for recording anal and penile/clitoral SEPs.
• To evaluate the influence of gender on the latency of these evoked potentials.
• To determine if there are significant interactions between stimulation site and gender.

Main Methods:

• Recorded anal and dorsal penile/clitoral SEPs in 84 healthy adults (40 males, 44 females).
• Stimulation was applied to the clitoris/penis base and anal orifice, with recordings from scalp electrodes.
• Multivariate analysis of variance (MANOVA) was used to analyze the effects of stimulation site and gender on P1 latency.

Main Results:

• The SEP recordings were well-tolerated and reproducible across all participants.
• Mean cortical P1 latency in females was 37.0 ms (anal) and 36.4 ms (clitoral).
• Mean cortical P1 latency in males was 38.0 ms (anal) and 40.2 ms (penile), with significant main effects and interaction found via MANOVA.

Conclusions:

• Anal and dorsal penile/clitoral SEPs are reliable methods for assessing sensory pathway integrity in both sexes.
• Significant latency differences exist between males and females, particularly for penile/clitoral responses.
• Sex-specific reference data obtained through individual electrophysiological testing is strongly recommended for clinical interpretation.