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Titolo:
A RAT MODEL FOR INVESTIGATION OF SPINAL MECHANISMS IN DETRUSOR INSTABILITY ASSOCIATED WITH INFRAVESICAL OUTFLOW OBSTRUCTION
Autore:
IGAWA Y; ANDERSSON KE; POST C; UVELIUS B; MATTIASSON A;
Indirizzi:
UNIV LUND HOSP,DEPT UROL S-22185 LUND SWEDEN UNIV LUND HOSP,DEPT CLIN PHARMACOL S-22185 LUND SWEDEN
Titolo Testata:
Urological research
fascicolo: 4, volume: 21, anno: 1993,
pagine: 239 - 244
SICI:
0300-5623(1993)21:4<239:ARMFIO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
URINARY-BLADDER CONTRACTIONS; MICTURITION REFLEX; OPIOID-PEPTIDES; MORPHINE; INHIBITION; NALOXONE; PATHWAYS; TRACT; CAT;
Keywords:
DETRUSOR INSTABILITY; INFRAVESICAL OUTFLOW OBSTRUCTION; RAT URINARY BLADDER; SPINAL MECHANISM(S);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
Y. Igawa et al., "A RAT MODEL FOR INVESTIGATION OF SPINAL MECHANISMS IN DETRUSOR INSTABILITY ASSOCIATED WITH INFRAVESICAL OUTFLOW OBSTRUCTION", Urological research, 21(4), 1993, pp. 239-244

Abstract

A rat model of infravesical outflow obstruction was modified to allowcystometric investigation in conscious, free-moving animals after intrathecal drug administration. The catheter position and extent of drugdistribution were controlled by injection of dye and dissection of the spinal canal. Continuous cystometries were performed in awake normalrats as well as rats with bladder hypertrophy and hyperactivity following infravesical outflow obstruction. In some animals of each group, cystometry was performed with simultaneous recording of intra-abdominal pressure. The possible effects of the presence of the intrathecal catheter were studied, as well as the effects of saline, local anesthetics, morphine and naloxone administered through the catheter. Neither the presence of the intrathecal catheter nor injection of saline affected the cystometric pattern. Bupivacaine (50 mug) produced paralysis ofboth lower extremities and a complete, though reversible, suppressionof micturition in normal rats. In rats with hypertrophy, intrathecal bupivacaine in doses of 50 mug and 100 mug produced decreases in micturition pressure, increases in bladder capacity and dribbling incontinence. However, the amplitude of spontaneous contractile activity increased after the administration. The inhibitory.effects of morphine (0.5-10 mug) on micturition in normal rats, which were rapidly reversed by naloxone, were in accordance with results obtained in previous studiesin anesthetized animals. Rats with bladder hypertrophy showed a similar response to morphine and naloxone. However, the bladder hyperactivity-was not inhibited by morphine. We conclude that the present model seems reliable for the study of spinal mechanisms in the development ofdetrusor instability associated with infravesical outflow obstruction.

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Documento generato il 01/10/20 alle ore 07:06:55