Objective: To compare the success rate of penile vibratory stimulation (PVS) alone with PVS and abdominal electric stimulation (AES).
Design: Single-subject trials.
Setting: Outpatient.
Participant: Man with chronic T3 complete (American Spinal Injury Association Impairment Scale grade A) spinal cord injury. Spasticity, Babinski response, anal wink, and bulbocavernosus reflexes were all present.
Intervention: Stimulation was presented to the frenulum using a Ferti Care Personal vibrator set at maximal settings (frequency, 110 Hz; amplitude, 3.55 mm). AES was applied to the abdomen using a commercially available muscle stimulator at maximal stimulus intensity and duration settings. Trials were randomized to PVS only or PVS plus AES.
Main Outcome Measures: Presence or absence of ejaculation, and time to ejaculation.
Results: Only 4 of 30 trials were positive with PVS alone, while 31 of 34 trials were positive with PVS plus AES. Additionally, 17 of 26 PVS trials, which were initially negative with PVS alone, were then positive with the addition of AES. This represents a clinically relevant improvement with use of AES. Time to ejaculation for positive trials with either technique was not statistically significant.
Conclusions: AES significantly lowered the threshold for ejaculation elicited with vibratory stimulation and increased the success rate over that when PVS alone was used.
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