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Intravesical Instillation of Oxybutynin Hydrochloride Therapy for Patients

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Intravesical Instillation of Oxybutynin Hydrochloride Therapy for Patients Paraplegia 32 (1994) 25-29 © 1994 International Medical Society of Paraplegia Intravesical instillation of oxybutynin hydrochloride therapy for patients with a neuropathic bladder l l l l 2 M Mizunaga MD, M Miyata MD, S Kaneko MD, S Yachiku MD, K Chiba !Department of Urology, 2Department of Pharmacy, Asahikawa Medical College, 4-5-3-11 Nishikagura, Asahikawa, 078 Japan. Intravesical oxybutynin hydrochloride was administered to 17 patients with a neuropathic bladder (myelomeningocele in 15 and spinal cord tumour in two) and urinary incontinence refractory to intermittent catheterisation. Therapy consisted of instillation of a 10 ml solution containing 5 mg oxybutynin hydro­ chloride twice daily. The cystometric bladder capacity before and after 1 hour of intravesical oxybutynin hydrochloride was 132 ± 45 ml and 193 ± 71 ml (mean ± 1 standard deviation, p < 0.01) in all 17 patients. In 13 patients with low compliant bladders, the mean bladder compliance before and after 1 hour of instillation was 4.2 ± 2.4 ml/cmH20 and 8.5 ± 6.4 ml/cmH20 respectively (p < 0.01). The period of the intravesical oxybutynin hydrochloride treatment ranged from 2 to 16 months (mean 11. 1 months). The improvement rate of 'moderately improved' and better response was 76.5% in all 17 patients. One patient complained of slight lower abdominal pain, which receded as treatment continued. Since the pH value of the solution appeared to be so low as to irritate the vesical mucosa, the value was adjusted to 5.85. No local or systemic side effects were observed thereafter. These encouraging results suggest that intravesical instillation of oxybutynin hydrochloride is an attractive alternative in patients with a neuropathic bladder, who are either unresponsive to or have intolerable side effects from oral medications. Keywords: urinary catheterisation; intravesical administration; neuropathic bladder; oxybutynin hydrochloride. Introduction The urinary complications of patients with a such as oxybutynin hydrochloride. Unfor­ neuropathic bladder consist of incontinence, tunately, many patients do not respond to inability to empty the bladder, urinary oral medications or have side effects that infection, and deterioration of the upper cause discontinuation of the treatment. urinary tract. In 1972, Lapides and associ­ Intravesical administration of drugs with ates! reported the successful treatment of known effects on bladder relaxation may neuropathic bladders with clean intermitt­ offer an attractive therapeutic alternative. ent catheterisation (CIC) and since then Recently, several investigators have re­ CIC has become widely accepted as the ported the positive effects on urodynamic main therapeutic management for patients parameters and improved symptomatology with such bladders. Adequate bladder emp­ in patients after intravesical instillation tying can be achieved by CIC, but urinary of oxybutynin hydrochloride. 2-6 However, incontinence may persist in the presence of there have been few reports on long term detrusor hyperreflexia and/or low com­ clinical effects concerned with intravesical pliance bladder. Management of patients instillation of bladder relaxants. Herein, we with urinary incontinence secondary to a investigated long term clinical effects of neuropathic bladder includes treatment with intravesical instillation of oxybutynin hydro­ anticholinergic and antispasmodic agents, chloride. 26 Mizunaga et at Paraplegia 32 (1994) 25-29 Materials and methods all patients prior to the instillation of oxy­ butynin hydrochloride. The solution of oxy­ Subjects consisted of 17 patients (nine males butynin hydrochloride was instilled into the and eight females) with neurogenic vesical bladder through the catheter which was dysfunction, ranging from 4 to 45 years old used for cystometry, and the catheter was (mean age, 12.3 years). The aetiology of the clamped. An hour later, the solution and neuropathic bladder was meningomyelocele stored urine were evacuated, and cysto­ in 15 patients and spinal cord tumour in two. metry was repeated. Cystometry was per­ The patients were classified into two groups: formed in 13 patients after continuing the 13 patients in group 1 had low compliant instillation therapy for a month. A statistical bladders (�1O ml/cmH20) with detrusor analysis of the change of cystometric blad­ areflexia, whereas four patients in group 2 der capacity and bladder compliance was had uninhibited detrusor contraction (detru­ done with the Student's t test. sor hyperreflexia). All patients in this study rely on CIC and continue to suffer from severe incontinence. For these patients, oral medications are not effective. Clinical effects At first, we used a solution of oxybutynin The patients were asked about the clinical effects espec.ially with regard to continence/ hydrochloride tablets which were crushed and dissolved in sterile saline (5 mg/lO ml). incontinence and to general side effects. But the pH of the solution was 4.55 and the They were instructed to instill the solution acidity might cause an irritating reaction in via a catheter used for CIe. The solution the vesical mucosa. So, we prepared the was left in the bladder until the next oxybutynin hydrocloride solution as follows. catheterisation. Instillation was done twice Tablets (500 mg as oxybutynin hydro­ a day. Seven patients who had already chloride) were crushed, and extracted with been prescribed oral oxybutynin hydro­ chloride continued taking the same dosage 0. 1 N HC1 800 ml, then filtered through a during the study of instillation. Clinical 0.45 JLm membrane filter to exclude the improvement was classified into four grades insoluble excipients of the tablet. The solu­ of 'markedly improved', 'moderately im­ tion was neutralised with 1 NNaOH 80 ml to pH 6.0, and aIM phosphate buffer of proved', 'slightly improved' and 'poor', 50 ml was added. Finally, the total amount evaluated from the condition of the incon­ of a 1000 ml solution was filtered through a tinence. 0.22 JLm membrane filter for sterilisation and dispensed into 100 tubes (5 mg/lO ml). The pH of the solution was 5.85, and Results oxybutynin hydrochloride was stable for 3 months at room temperature protected from Cystometric findings light. Cystometric bladder capacity increased in 14 patients whereas it had not changed in three. Mean bladder capacity before and Urodynamics after an hour of instillation was 132 ± 45 ml Cystometry was performed with the patient and 193 ± 71 ml (p < 0.01) in all 17 patients in the supine position. A single lumen (Fig 1). In 13 patients, reexamined after 1 catheter (8-12 Fr) was introduced via the month of instillation therapy, the mean urethra for carbon dioxide filling and pres­ bladder volume was 208 ± 55 ml. Compli­ sure recording. Rectal pressure was con­ ance of the bladder after the instillation was sidered representative of abdominal pres­ measured at the same point of the bladder sure and registered with a rectal balloon volume as before the instillation. In 13 catheter. Detrusor pressure (Pdet) was esti­ patients with low compliant bladders, the mated by subtracting abdominal pressure mean bladder compliance before and after 1 from intravesical pressure. Carbon dioxide hour of instillation was 4.2 ± 2.4 ml/cmH20 filling rates ranged from 50 to 100 ml per and 8.5 ± 6.4 ml/cmH20 (p < 0.01, Fig 2). minute. The cystometry was performed in In 10 patients, reexamined after 1 month Paraplegia 32 (1994) 25�29 Intravesical instillation of oxybutynin hydrochloride 27 P < 0.01 of instillation therapy, the mean bladder / NS compliance was 12. 1 ± 8. 1 ml cmH20. The 300 P < 0.01 I cystometric curves before and after instilla­ ( :::0 250 tion in two patients group 1 and group 2) E 13 are depicted in Figures 3 and 4. - 200 QJ E 150 :::J (5 100 Clinical symptomatology > 50 The period of the bladder instillation therapy ranged from 2 to 16 months (mean O�--���--���--���L--- Baseline 1 hour later 1 month later 11. 1 months) . The overall clinical effect of I I this therapy in all 17 patients is depicted in Intravesicaloxybutynin Figure 5: 'markedly improved' in six, 'moderately improved' in seven, 'slightly Figure 1 Bladder capacity in 17 patients before improved' in two, and 'poor' in two. In and after the use of intravesical oxybutynin ( ) hydrochloride. Bladder capacity significantly in­ group 1 low bladder compliance four were creases after instillation. "markedly improved", five were 'moderately improved', two were 'slightly improved' and two were 'poor'. In group 2 (detrusor o N I a E 20 BASELINE � E 15 ·· . · ··· QJ Pdet l · g 10 �I I , , , co o 50 100 150 200 ml Cl. 5 E b 8 O-'----IilLL.Cf'L"=--------""L"'"i"''"""'------''''''''''TiLLLL"---- Baseline 1 hour later 1 month later INTRAVESICAL OXYBUTYNIN L I . .... :. : : .: . : . ..: : .. .......: .: .: .: . : -. -. · cmH20/div .. Intravesicaloxybutynin Pdet ••• 110 .. .. .. I I I I I Figure 2 Bladder compliance (ml/cmH20) in 13 o 50 100 150 200 ml patients (group 1) before and after the use of intravesical oxybutynin hydrochloride. Bladder Figure 4 Cystometrograms (a) before and (b) compliance significantly improved after instilla­ after intravesical oxybutynin hydrochloride in a tion. 15 year old boy with a spinal cord tumour. a BASELINE =. ..ce::............. ... .. ... .. ... ... .. .... ..... ... .. Pdet . L.-.< . '"--_ . .. .. ... _ I I I o 50 100 ml b INTRAVESICAL OXYBUTYNIN . ......... .. ...... ...... /d:� . ..... .. �::-'-: . .. .� ... .� . � . : -- ------.... ...� ..... .- .... : Pdet �· ':: I'10 cmH2 0· · . ···········. .
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