CLINICAL AND QUALITY-OF-LIFE OUTCOMES AFTER AUTOLOGOUS FASCIAL SLING AND TENSION-FREE VAGINAL TAPE: A PROSPECTIVE RANDOMIZED TRIAL
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JOAO L. AMARO, HAMILTO YAMAMOTO, PAULO R. KAWANO, GUILHERME BARROS, MONICA O. O. GAMEIRO, APARECIDO D. AGOSTINHO

Department of Urology (JLA, HY, PRK, ADA), Department of Anesthesia (GB) and Section of Physiotherapy (MOOG), School of Medicine, UNESP, Botucatu, Sao Paulo, Brazil

ABSTRACT

     Purpose: Evaluate the impact autologous fascial sling (AFS) and tension-free vaginal tape (TVT) procedures on quality-of-life in incontinent women.
     Materials and Methods: Forty-one women were randomly distributed into two groups. Group G1 (n = 21), underwent AFS and group G2 (n = 20) TVT implant. The clinical follow up was performed at 1, 6, 12 and 36 months.
     Results: TVT operative time was significantly shorter than AFS. Cure rates were 71% at 1 month, 57% at 6 and 12 months in G1. In G2, cure rates were 75% at 1 month, 70% at 6 months and 65% at 12 months; there was no significant difference between groups. As regards the satisfaction rate, there was no statistical difference between groups. Analysis of quality of life at 36 months revealed that there was no significant difference between groups.
     Conclusion: Similar results between AFS and TVT, except for operative time were shorter in TVT.

Key words: urinary incontinence, stress; suburethral slings; tensionless vaginal tape; random allocation
Int Braz J Urol. 2009; 35: 60-7

INTRODUCTION

     Urinary incontinence (UI) can have a severe impact on quality of life (QoL). Thus, assessing the effect of interventions is of relevance. QoL is a multidimensional concept reflecting an individual’s experience of physical, emotional and social well being, as well as perceptions of health status (1). In general, UI has been shown to affect the psychological occupational, domestic and sexual lives of 15% to 30% of women at all ages (2). QoL is an abstract and highly subjective concept influenced by personal and cultural values, beliefs, self concepts, goals, age and life expectancy. It is usually measured using structured questionnaires containing a variable number of fields. There are two major types of QoL questionnaire, generic and disease specific. Unfortunately, the generic forms are often used inappropriately in incontinent women (3) and it is necessary to use a disease or condition-specific quality of life measure, e.g. the King’s Health Questionnaire (KHQ) (4).
     Sling procedures have been used for treatment of urinary incontinence in women since the beginning of the 20^th century (5). Indications for biologic grafts include patients with a history of poor vaginal healing, pelvic bone trauma, pelvic radiation therapy, or urethral reconstruction or are based on surgeon’s preference (6). Success rates of autologous graft used for mid-urethral slings range from 70-91 % at 33-52 months (7).
     Tension-free vaginal tape (TVT) has been introduced as a minimal invasive sling procedure for treatment of stress urinary incontinence (SUI) with a high success rate (8).
     The aim of this study was to evaluate the impact of autologous fascial sling (AFS) and TVT procedures on QoL in incontinent women.

MATERIALS AND METHODS

     Between January 2001 and March 2002, 41 women, from the Urogynecology Outpatient Clinic of Botucatu Medical School - UNESP, with a principal complaint of stress urinary incontinence were studied in a prospective trial. These patients were randomly distributed into two groups. Group G1 (n = 21) was submitted to AFS and Group G2 (n = 20) to TVT implant. The randomization followed a blind raffle where the procedures (TVT and Sling) were written on small pieces of paper, folded and placed into a closed box. It was opened just before the surgery when the medical team found out which procedure would be performed. Mean age in G1 was 49 years (range 26-69), and in G2, 52 years (range 26-79). All surgical procedures were performed by the same surgeon. This study was approved by the Bioethics Committee of Botucatu Medical School - UNESP.
     Before surgery, stress urinary incontinence was urodynamically confirmed (Dynograph R.611 recorder) in all study participants. The following parameters were investigated: free maximum urinary flow (Q_max), maximum detrusor pressure (P_det.max) and maximum urinary flow (Q_max) during voiding. Valsalva leak-point pressure (VLPP) was obtained when the patient, in lithotomy position, reported the desire to void due to maximum bladder capacity. Detrusor overactivity was defined as the presence of spontaneous or provoked involuntary detrusor contractions during vesical filling phase, whether partially suppressed or not (9). Bladder outlet obstruction was considered when P_det/Q_maxexceeded 20 cm H₂O with maximum flow rate (Q_max) below 12 mL per second (10). Patients with involuntary detrusor contractions or preexisting bladder outlet obstruction during urodynamic analysis were excluded.
     The clinical follow-up was performed and subjective success rate was evaluated in a transversal cut off at 1, 6, and 12 months and then annually after hospital discharge. A questionnaire was used to obtain personal data, obstetric, gynecologic, family medical history, and subjective analysis of urine loss. Cure was defined as complete dryness with no usage of pads as reported by the patient.
     De novo urgency was defined as the postoperative development of symptoms of urgency, which were not present before surgery and persisted for more than 1 month. These symptoms were based on clinical evaluation.
     Cure rate, long-term patients’ satisfaction and impact on QoL were performed at 36 months after surgery. For QoL evaluation, a validated questionnaire (11) (King’s Health Questionnaire) and personal interviews were conducted. The questionnaire consists of 4 sections, the first contains 2 domains that measure female perception of general health and the impact of urinary symptoms on life. The second section contains 14 questions that allow women to rate the impact of urinary symptoms on 5 other QoL fields, namely role limitations, physical/social limitations, personal relationships, emotions and sleep and energy. The third section assesses the severity of measures associated with urinary incontinence. The fourth section consists of a separate scale for rating different urinary symptoms, including stress incontinence. Scores in each domain range between zero and 100, a higher score indicating a greater impairment of QoL (4). Follow-up ranged from 36 to 54 months (median: 44 months) as surgeries were performed at the different dates.
     Body mass index (BMI) was calculated and classified according to Garrow (12).
     All patients underwent physical examination including stress test. The degree of pelvic organ prolapse was assessed and graded according to Baden et al. (13).
     Basal laboratory investigations (serum creatinine, complete blood count, chemical and microscopic urinalysis, urine culture) were all routinely performed. In exceptional cases (history of lithiasis, urinary infection) renal ultrasound and plain X-ray of the kidney, ureters and bladder were carried out.
     In the immediate postoperative, intravenous tramadol (10 mg/mL^-1) was used in a patient-controlled analgesia (PCA) pump. After an i.v. loading dose of 0.07 mL/Kg^-1 (administered over a period of 30 min), a continuous background i.v. infusion was set at 1.5 mL/h^-1 and a demand bolus injection was set at 0.2 mL (lock out interval of 30 min.). Data of PCA demand, dose delivered and total analgesic consumption were retrieved from the PCA computer data bank.

Operative Technique
     Autologous fascial sling was carried-out as previously described with some modifications (14). A transverse suprapubic incision for withdrawal of the rectus fascia strip (10 x 2 cm) and aponeurosis closure was done with 1-vicryl thread. The strip was prepared and both its edges were tied with 0-prolene, which was left long. A Foley catheter was used to empty the bladder. A submucosal saline injection was performed on the anterior vaginal wall and a longitudinal incision was performed 2 cm from the urethral orifice. Dissection of the vaginal mucosa was done until identification of the retropubic space. Then the strip of rectus fascia was positioned with the aid of Stamey needle around the middle urethra maintaining the strip without tension. The wires were approximated in the midline and the sling was fixed to the underlying peri-urethral fascia using 4-0 catgut sutures at the 6 and 12 o’clock positions. The vaginal mucosa and the suprapubic skin incision were then closed. Cystoscopy was performed in all patients submitted to autologous sling.
     The TVT procedure was performed as described by Ulmsten et al., except that the operation was carried out under spinal anesthesia (8). Cystoscopy was performed in all patients.
     Foley catheter was left indwelling for 1 day in all patients after anti-incontinence surgery. The following parameters were postoperatively evaluated: operative-room time, objective postoperative pain, complications, length of hospital stay, postoperative catheterization, and time to return to normal activities.
     The analysis of clinical and urodynamic characteristics were performed using the Mann-Whitney non-parametric test for quantitative variables (15) and the Godman test as regards the categorical ones (16). Differences were considered significant for p value < 0.05.

RESULTS

     No statistically significant difference in the demographic data and urodynamic parameters were preoperatively observed between groups (Table-1). Operative time was significantly shorter than TVT than with AFS. There was no statistical difference between groups in bladder injuries, hospitalization time, post-operative catheterization and return to normal activities (Table-2). There was neither prolonged urine retention nor other complications in both groups.





     Cure rates were 71% at 1 month, 57% at 6 and 12 months, and 55% at 36 months in G1, whereas in G2 they were 75% at 1 month, 70% at 6 months, 65% at 12 months and 63% at 36 months, with no significant difference between groups.
     Although 2 patients, one from each group, died from other diseases within the 36-month following period, the post-operative satisfaction rate was 80% in G1 and 58% in G2, with no statistical difference between groups (Table-3). However, in AFS group, the satisfaction rate was 62.5 to 97.5%, while in TVT group it was between 36 to 80%. A 95% confidence interval was used for satisfaction assessment.



     De novo urgency symptoms were observed in 40% of the patients in G1 and in 42% of those in G2 at 36 months with no difference between groups.
     Condition-specific QoL postoperatively assessed by the King’s Health Questionnaire (KHQ) did not significantly differ between groups (Table-4).



     The comparison between satisfaction rate and condition-specific QoL contained in the KHQ showed a significant correlation between these variables demonstrating that unsatisfied patients had higher scores in all different fields, except in perception of general health.

COMMENTS

     In our study, the initial demographic and urodynamic data demonstrated homogeneity between the groups.
In the immediate postoperative period, there were no differences between the groups, except for operating time, which was significantly shorter in the TVT group. Similar outcomes were observed in relation to this parameter; however, no additional risk associated with this finding was observed (17). Song et al. (18) observed a shorter operating time and quicker recovery in TVT group. Despite this, in the postoperative analgesia using PCA pump did not statistically differ between groups in this study, showing that there was no additional discomfort associated to the techniques used.
     In general, cure rate may be based on a great variety of parameters, some of them seem to be very lenient whereas others are relatively subjective. Therefore, it may be more appropriate to report each selected variable separately in order to accurately convey true outcomes. In our series, cure rate was considered as complete dryness with no usage of pads, and similar results were observed in both groups. Applying the same cure criteria in a prospective randomized study, Wadie at al. (17) observed short-term success rates with AFS and TVT (92%) which were higher than those encountered in this study.
     Urgency incontinence is usually more bothersome for women than stress urinary incontinence. Women with de novo urgency are significantly older, have higher BMI, and higher parity than those without it (19). Damage to bladder autonomic denervation has been suggested as one of the causes of de novo urgency, which could be due to extensive bladder dissection for pubovaginal sling in contrast with TVT procedure that required little dissection (20). However, incidence of de novo urgency was similar both groups studied here. Nonetheless, given that de novo urgency is more bothersome, this fact might have similarly interfered with the quality of life of patients in both groups. Some authors observed 4% of de novo detrusor overactivity with AFS and no cases with TVT implant (20). It is noteworthy that in this study the diagnosis of de novo urgency was based on clinical rather than urodynamic criteria, and this might explain the higher incidence observed.
     Long-term satisfaction rate did not statistically differ between groups. Despite the higher satisfaction rate observed in the AFS group (80% versus 58%, p > 0.05), even if more samples were included in this study, the results would likely show significantly higher satisfaction rate in AFS group.
     In long-term evaluation of QoL no statistical difference was observed between groups. This study assessed the effect of AFS versus TVT on QoL in the surgical treatment of UI in women. The measurement of QoL is particularly important in the field of urinary incontinence, given that it is largely a symptom-defined condition. The disease-specific QoL (KHQ) a version validated in Portuguese, classified as recommended, was used (11). The present findings showed that AFS and TVT produced similar improvements in QoL at 36-month study. Morgan et al. (21), using a mailed questionnaire validated to QoL (HRQoL), also observed no significant differences in patients who had undergone AFS or TVT.
     The analysis between satisfaction rate and QoL evaluation showed that unsatisfied women presented a higher score in the different fields, except in general health; this demonstrated the importance of using disease-specific QoL when evaluating outcomes in anti incontinence procedures.

CONCLUSION

     In this study, AFS and TVT yielded similar results, except for operating time which was shorter in TVT. This finding is very relevant for developing countries where synthetic slings are often costly. However, further control studies are warranted considering AFS is associated with lower cost and rate of disease transmissions, as well as no rejections when compared with synthetic techniques.

CONFLICT OF INTEREST

     None declared.

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____________________
Accepted after revision:
September 9, 2008

_______________________
Correspondence address:
Dr. João Luiz Amaro
Departamento de Urologia
Faculdade de Medicina de Botucatu
Botucatu, SP, 18618-970, Brazil
Fax: + 55 14 3811-6271
E-mail: jamaro@fmb.unesp.br