Male sexual impotence in diabetes mellitus: vasculogenic versus neurogenic factors

Abstract

In an attempt to understand better the role of vascular and neurogenic alterations in the pathophysiology of diabetic impotence, 29 impotent male patients with diabetes mellitus (DM) were investigated by means of doppler ultrasound examination (DUE) of penile arteries, sacral evoked responses (SERs), peripheral nerve conduction studies, and, in most cases, nocturnal penile tumescence monitoring (NPTM). Fourteen patients showed isolated alterations of penile vascular supply, four isolated alterations of penile segmental innervation, and seven combined vasculogenic and neurogenic abnormalities; finally, in four patients, DUE, SERs, and NPTM were normal. One patient, in spite of the presence of marked vasculogenic and neurogenic alterations, showed nocturnal penile erections. Results confirm that vascular obstruction, more than nerve damage, plays a primary role in the pathophysiology of diabetic erectile failure, and stress the importance of psychogenic factors. The observation that some patients presented marked involvements of both arterial supply and neurological pathways only a few years, or even 1 year, after the diagnosis of the disease, indicates the need of an early screening of the vascular and neurological status, even in asymptomatic patients. Furthermore, all patients with altered SERs had peripheral neuropathy; on the other hand, six patients with peripheral neuropathy had normal SERs. This result stresses the diagnostic importance of the electrophysiologic studies of sacral segmental innervation and indicates further that in a comprehensive diagnostic protocol of diabetic impotence the study of SERs should be performed only in patients with peripheral neuropathy.

Does severity of ischemic coronary disease correlate with erectile function?

“…Benvenuti et al reported that vascular occlusion, more than nerve damage, plays a primary role in the pathophysiology of diabetic erectile failure. 10 His ®nding would then explain our results in patients with demonstrated ischemic vascular disease in their coronary arteries.…”

Diabetes and male sexual function

“…Patients with insulin-dependent diabetes and associated coronary artery disease have significantly more severe disease related to the cavernosal artery than noninsulin-dependent diabetic patients (47). Benvenuti et al (48) proposed that, in diabetic ED, vascular obstruction is a more important factor than nerve damage. The main complication of diabetes is atherosclerosis.…”

Erektil'naya disfunktsiya u bol'nykh sakharnym diabetom

“…Мужчины с признаками периферической нейропатии чаще стра дают ЭД, чем больные СД без нейропатии [24]. Ча стота диабетической нейропатии значительно выше у больных с ЭД, чем у пациентов с сохраненными эрекциями; часто, у больных СД наряду с нейроген-ным имеется и васкулогенный фактор развития ЭД [6]. Получены данные о поражении нервных воло кон кавернозных тел у больных СД; у мужчин, стра дающих СД, повышен адренергический тонус нерв ной системы.…”