Abstract
The purpose of this work was to determine whether vibration stimulation or erotic videotape material can provide an acceptable diagnostic yield for patients with erectile dysfunction (ED) without the patient needing to endure more explicit erotic films, which may be distasteful to some patients, or intracavernous injections, to which there may be a high inhibitory response. Ninety-five subjects were randomly exposed to either vibration or videotape alone and erectile response monitored by the RigiScan. Where no clinical response was recorded by the RigiScan or by self-report by the patient, both stimuli were presented to the subject. Forty-nine subjects received vibration first and 46 received videotape first. Use of clinically based standardised measures revealed neither group achieving above threshold responses to the first stimulation and there were no differences between the two groups. Eight subjects (8%) between both groups exceeded the tip threshold during combination stimulation. Single stimulation with vibration or erotic videotape with provocative RigiScan monitoring is unhelpful in the assessment of ED in any of the diagnostic subgroups of ED. In comparison to previous provocative studies, combination of stimuli sets, whilst increasing penile response (circumferential change and rigidity) did not lead to significant evidence of clinically relevant responses using current RigiScan measures or patient self-report of change. Further studies are necessary to determine the most useful set of stimuli for provocation studies with the RigiScan.
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We acknowledge the advice and contribution from Chris Todd, Research Assistant, Community Health Sheffield.
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Appendix: Patient videoscreen message
Appendix: Patient videoscreen message
You are about to either experience vibration applied to the under surface of your penis or see an erotic video. The test lasts for about 15 min. If no response is obtained you will have vibration applied to the under surface of your penis and asked to watch an erotic video. The vibration or video is designed to be a pleasant experience, so feel free to respond in any way that you like. You may respond sexually if you want—to feel warm, to get an erection or anything else. However you react is fine, but we do ask that you do not stimulate your penis with your hand. You can experience the vibration from the stimulator when advised. If you do not get an erection, that is also fine—it is totally normal. We ask that you enjoy whatever physical or sexual sensations you may have.
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Wylie, K., Steward, D. & Walters, S. Does vibration offer any advantage over visual stimulation studies (VSS) in the assessment of erectile capacity?. Int J Impot Res 13, 329–337 (2001). https://doi.org/10.1038/sj.ijir.3900781
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DOI: https://doi.org/10.1038/sj.ijir.3900781
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