ABSTRACT
The effect of bethanechol, a muscarinic agonist, was studied by cystometrography in conscious rats with bilateral pelvic nerve (PN) lesions. In sham-operated rats, the transvesical infusion of saline elicited regularly micturition. The micturition was abolished by the bilateral PN transection, resulting in overflow incontinence. Bethanechol (30 mg/kg), administered orally to denervated rats, significantly increased the micturition frequency. Therefore, the micturition seems to be largely dependent upon muscarinic receptors of the bladder, and the finding supports the clinical effect of bethanechol. Moreover, this animal model may be useful for studying the overflow incontinence from detrusor failure of neuropathic origin.
Subject(s)
Bethanechol/pharmacology , Muscarinic Agonists/pharmacology , Urinary Incontinence/drug therapy , Administration, Oral , Animals , Denervation , Male , Rats , Rats, Wistar , Urinary Bladder/drug effects , Urinary Bladder/innervation , Urinary Bladder/physiology , Urinary Incontinence/etiologyABSTRACT
It has been reported that MR imaging of the spleen is unsuccessful in detecting focal lesions because there is not a significant difference in relaxation times between most tumors and surrounding normal spleen. We reviewed the MR imaging of 15 patients (5 cysts, 2 abscesses, 1 hemangioma, 5 malignant lymphomas, 2 metastatic tumors). In all cases, the difference in signal intensities between splenic tissue and mass lesions permitted detection of splenic lesions on MR images. But, malignant lesions were less visible than benign lesions.
