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Titolo:
Sphincteric events during penile vibratory ejaculation and electroejaculation in men with spinal cord injuries
Autore:
Sonksen, J; Ohl, DA; Wedemeyer, G;
Indirizzi:
Univ Michigan, Urol Sect, Ann Arbor, MI 48109 USA Univ Michigan Ann ArborMI USA 48109 , Urol Sect, Ann Arbor, MI 48109 USA Univ Copenhagen, Rigshosp, Dept Urol, DK-2100 Copenhagen, Denmark Univ Copenhagen Copenhagen Denmark DK-2100 , DK-2100 Copenhagen, Denmark
Titolo Testata:
JOURNAL OF UROLOGY
fascicolo: 2, volume: 165, anno: 2001,
pagine: 426 - 429
SICI:
0022-5347(200102)165:2<426:SEDPVE>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
STIMULATION; QUALITY; SEMEN; PARAMETERS; FERTILITY;
Keywords:
spinal cord injuries; ejaculation; vibration; electric stimulation; infertility;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Ohl, DA Univ Michigan Hosp, Urol Sect, TC 2918-0330,1500 E Med Ctr Dr, AnnArbor, MI 48109 USA Univ Michigan Hosp TC 2918-0330,1500 E Med Ctr Dr Ann Arbor MI USA 48109
Citazione:
J. Sonksen et al., "Sphincteric events during penile vibratory ejaculation and electroejaculation in men with spinal cord injuries", J UROL, 165(2), 2001, pp. 426-429

Abstract

Purpose: We investigate internal and external sphincter responses during penile vibratory stimulation and electroejaculation in men with spinal cord injury. Materials and Methods: Ejaculation induction with simultaneous recording of external and internal sphincter pressures was performed in 9 spinal cord injured men. Of the patients with upper motor neuron lesions 3 underwent penile vibratory stimulation and 3 underwent electroejaculation. In 3 men whodid not respond to PVS, including 1 with upper motor neuron and 2 with lower motor neuron lesions, penile vibratory stimulation and subsequent electroejaculation were performed. Results: In successful penile vibratory stimulation and electroejaculationupper motor neuron cases external sphincter pressure first reached a peak (average 180 cm. H2O) and subsequently decrease followed in 3 to 10 secondsby a peak in internal sphincter pressure (average 178 cm. H2O), which exceeded external sphincter pressure and ejaculation occurred. During electroejaculation, the pattern progressed, despite complete discontinuation of electrical stimulation. In electroejaculation, there was a trend for a more rapid return of external sphincter pressure greater than internal sphincter pressure, which may explain the electroejaculation retrograde fraction. In nonresponders external sphincter pressure never increased to more than 105 cm. H2O in response to penile vibratory stimulation and no ejaculation was induced. In nonresponders to penile vibratory stimulation, electroejaculationinduced a typical sustained increase in internal sphincter pressure and external sphincter pressure but at lower peak pressures. Conclusions: Forceful contraction of the external sphincter followed by contraction of the internal sphincter always precedes ejaculation during electroejaculation and penile vibratory stimulation. Similarities between penile vibratory stimulation and electroejaculation suggest that the latter induces ejaculation via a complex neurological pathway rather than by simple direct end organ stimulation. The sustained nature of the response to electroejaculation suggests that electrical stimulation should be stopped completely during ejaculation to allow more relaxation of the external sphincter, as this may lead to a decrease in the retrograde fraction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 23:36:37