Neurophysiologic studies of the penilo-cavernosus reflex: normative data.

Area of Science:

• Neuroscience
• Urology

Background:

• The penilo-cavernosus reflex is a key indicator of sacral nerve function.
• Establishing normative data is crucial for accurate clinical interpretation.

Purpose of the Study:

• To determine normative values for the penilo-cavernosus reflex.
• To assess reflex responses using single and double electrical, and mechanical stimulation.

Main Methods:

• 26 men without neurological disorders underwent sacral neurophysiologic studies.
• The penilo-cavernosus reflex was measured using needle electrodes in the bulbocavernosus muscle.
• Latency, sensory, and reflex thresholds were recorded under different stimulation conditions.

Main Results:

• Reflex responses were consistently recorded across all stimulation types.
• Normative latency values were established for single electrical (39.4 msec), double electrical (36.0 msec), and mechanical (35.5 msec) stimulation.
• Normative sensory (14.5 mA, 10.5 mA) and reflex thresholds (49.6 mA, 26.9 mA) were determined for single and double electrical stimulation, respectively.

Conclusions:

• Published normative values for latency on single electrical and mechanical stimulation were corroborated.
• New normative data for double electrical stimulation latency and sensory/reflex thresholds were generated.
• These expanded normative values are expected to improve the diagnostic utility of the penilo-cavernosus reflex.