Urinary Stress Incontinence Clinical Trial
Abstract:
Urinary Stress Incontinence (USI)- is a discomforting condition that negatively affects the
quality of life of many female individuals and frequently treated by surgical intervention.
The incontinence curative operations revolutionized at 1995, with the introduction of the
first retro-pubic sub-mid urethral synthetic sling, firstly named Intra-Vaginal Sling-plasty
(IVS) and then Tension Free Vaginal Tape (TVT), by Ulmsten and Petros. This was later
proposed to be done trans-obturatorly (TOT), for avoiding operative bladder injuries.
Among other peri-operative complications attributed to the commonly used anti-incontinence
TOT are the thigh and groin pain. These pains are subjects of concern for patients and
physicians worldwide. Another, rare yet very disturbing post-operative complication is
erosion of the polypropylene tape into the vagina. TOT palpation at vaginal examination was
claimed to be a predictive sign for future erosion of the polypropylene tape into the vaginal
cavity.
This current study aims to compare TVT-Abbrevo procedure (12 cm polypropylene tape, Ethicon
J&J Somerville, NJ, USA ) to Serasis procedure (softly knitted monofilament non-absorbable
polypropylene, Serag-Wiessner, Naila, Germany) for the cure of USI. The purpose of this study
is to evaluate the feasibility, the safety and the cure rate of both procedures, as well as
documenting the post-operative immediate, and long term thigh and groin pain levels, and
dyspareunia. This study is aimed to evaluate the palpability of the implanted tapes at
vaginal examination and the possible relation of this to further vaginal tape exposure.
Investigators hypothesized that using Serasis tape, which is made of a softer polypropylene
material than rather rigid TVT-Abbrevo polypropylene tape might result in lower pain levels
at the short and long term post-operative course, as well as to reduced tape palpability and
exposure to the vaginal cavity. investigators believe that favorable results for this study
might improve patients' post-operative quality of life and overall satisfaction.
Keywords: Serasis, TVT-Abbrevo, USI, pain, groin, thigh, dyspareunia, safety, urinary stress
incontinence, sub mid urethral sling, trans-obturator, TOT, Intra-Vaginal-Sling plasty.
Introduction:
The International Uro-gynecological Association (IUGA) and International Continence Society
(ICS) defined urinary stress incontinence (USI) as urine loss condition during effort,
physical exertion such as sports activities, or while sneezing or coughing1. USI is not a
life threatening condition, yet, if left untreated, it might have a significant negative
impact on quality of life of many patients. According to epidemiologic studies woman's age,
multi-parity and menopausal status are all risk factors for USI1,2.Treatment options offer
changes in life style, and nonsurgical modalities such as pelvic floor muscle training which
can be useful in mitigating discomforting symptoms. However, upon failure of conservative
treatment, surgery will be recommended for women who are unsuccessful in coping with USI3.
Intravaginal sling-plasty retro-pubic surgical procedure was reported by Ulf Ulmsten and
Peter Petrous at 1995 for treating urinary stress incontinence4. Soon after, a study was done
on this new procedure now called TVT, which was concluded to be a safe and an efficient
ambulatory procedure4-6. This led to a major change with the uro-gynecologic operation
preferences, based mainly on the open retro-pubic operations before hands. Trans-obturator
sub mid urethral tape procedures (TOT) for treating female urinary stress incontinence were
reported then-after, first by Delorme 7, then by De Leval 8. The TOT procedures were designed
in order to minimize the incidence of some TVT related adverse effects that might severely
impede patient's rehabilitation and health, such as urinary tract injuries, urinary outlet
obstruction, bowl penetration and intra-operative bleeding9,10. The TOT procedures' efficacy
was claimed to be non-inferior to the TVT, therefore became greatly adopted by
uro-gynecologists world-wide9. The fact that the TOT needle passes through the medial
compartment of the obturator fossa 2.5-3.0 cm to the obturator vessels and nerves, might
explain the incidental post-operative thigh pain10.
Despite the fact that TOT is reported to have low complication rates, there are still
complaints on post-operative thigh and groin pain as well as dyspareunia11. Study on a mini
TVT, a single incision sling that doesn't pass through the obturator membrane, proved reduced
post-operative pelvic and thigh pain, yet many surgeons are reluctant to use mini TVT
implants because of reduced cure rates. Dyspareunia, however, occurred with TVT, TOT and mini
TVT procedures causing concern with sexually active patients11. Thus TOT procedures are
frequently performed and thigh and groin pains are constantly a common complications caused
by trans-obturator passage of the sling close to the obturator nerve. The typical TOT
post-operative pain is at the thigh, uni or bilateral, yet it was described even at the
lumbar spine or hip regions. This might have been due to patient's hips position during
operation, but more likely to intra-operative obturator nerve injury or post-operative nerve
impact, due to a direct pressure or tape foreign body reaction9. Jean De Leval, Alexandre
Thomas and David Waltregny proposed a modified TOT, the TVT-Abbrevo (Ethicon J&J Somerville,
NJ, USA). The polypropylene tape's length was reduced to 12 cm. The TVT-Abbrevo was developed
in order to avoid extensive tape trans-obturator traumatic passage, reduce amount of mesh in
the aponeurotic tissues, and this way to reduce the postoperative pain in the thigh and groin
areas9. Their results showed that the group underwent modified TVT-Abbrevo procedure
experienced less pain on day 0 than the TVT-Obturator group but not thereafter 9,12. In
addition to thigh and groin pain, Sue Ross, in his clinical study was concerned to find that
an indicative number of women in TOT group had a palpable polypropylene tape at vaginal
examination one year after the surgery13. These findings are rather concerning because risk
factors for unfavorable outcomes of tape surgeries are not completely understood. It is hard
to state whether palpable tapes will lead to erosions or get absorbed into the vaginal tissue
that will result in further complications13,14.
The Serasis (Serag-Wiessner, Naila, Germany) was launched for the potential beneficiary
impact of especially soft knitted sling implant on the occurrence and severity of
post-operative pain. The ratio behind it is the notion that the tape softness will reduce
tissue trauma when the tape is introduced through the obturator plat and maybe less fibrotic
tissue reaction as well. There are no comparative studies performed on effectiveness of
Serasis tape implantation as an anti-USI procedure, neither a comparison against other
polypropylene tapes.
Aims of this study:
In this prospective study investigators wish to aim to compare the Serasis to the
TVT-Abbrevo, used for the treatment for USI. Firstly, investigators will evaluate
feasibility, the safety and the curative rate of both procedures including the post-operative
immediate and long term pain levels as well as the dyspareunia with both groups. Secondly,
investigators will evaluate differences in the ability to palpate the Serasis and TVT-Abbrevo
tapes at vaginal examination in both groups one year post surgery. In this study
investigators focus our attention on rigidity of the Serasis tape versus the common
polypropylene tape, which is provided with the TVT-Abbrevo. In addition, investigators will
evaluate the significance of previously reported phenomena of vaginal palpability of TVT one
year after the implantation 13,14.
Study Hypothesis:
Previous studies showed that the TVT-Abbrevo caused less immediate post-operative thigh and
groin pain but was not found in the long term12. This current study hypothesis is that being
gently knitted, the Serasis tape, would be superior to the TVT-Abbrevo tape, in terms of
post-operative pain levels and severity. Investigators think that Serasis might be an
effective solution for the above stated post-operative complications due to its softer
monofilament non-absorbable polypropylene tape.
The author presumes that:
1. The objective and subjective curative rates should be around 85% in Serasis group and in
TVT-Abbrevo group.
2. Early postoperative pain levels, caused probably by operative trauma, will be the same
in Serasis and TVT-Abb groups of patients.
3. The long term post-operative pain levels, dyspareunia and ability to palpate the
implanted tape at vaginal examination will be reduced with the Serasis patients' group
in comparison to the TVT-Abbrevo groups of patients.
Study significance:
Results of this study will provide important limited information regarding Serasis and
TVT-Abbrevo tapes, such as efficacy, immediate and long term post-operative outcomes and
vaginal tape palpability and exposure. This data might improve surgeon's decision making and
patients' outcome and satisfaction. If adverse clinical postoperative outcomes will be found
to be reduced with the gently knitted sling, patient care and quality of life might be
improved as well.
Methods:
1. Study design: This is a double arm, prospective and randomized comparative study.
Randomization will be done by anesthesiologist flipping a coin right before beginning of the
procedure.
The enrolled patients will be given detailed, open and transparent thorough data regarding
the study. Patients will sign an informed consent and get randomized onto one of the two
study groups, to have either Serasis or TVT-Abbrevo.
The operations will be performed under general anesthesia and the patients will be discharged
8 hours after surgery.
The operations will be performed according with previously medially deviated trans-obturator
needle passage11.
Data will be downloaded from the patient's medical charts and collected on interviews by
using 3 questionnaires (Pain Q, UDI-6, IIQ-7) and physical exams.
1. Pre-operation: interview+ physical exam+ (Pain Q, UDI-6, IIQ-7).
2. Intra-operative estimate of feasibility and safety: needle passage ease and adjustment
(VAS system), estimate blood loss (CC).
3. Before discharge from the hospital: chart data download, interview+ physical exam+ pain
questionnaire.
4. Early postoperative follow up: interview and a pain questionnaire by telephone on the
1st post-operative day.
5. 1 month follow up: interview+ physical exam+ Pain Q, UDI-6, IIQ-7 questionnaires,
palpability score will be determined at physical exam.
6. 3 months follow up: interview by telephone+ Pain Q, UDI-6, IIQ-7 questionnaires
7. 12 months follow up: interview + Pain Q, UDI-6, IIQ-7 questionnaires, physical exam
including objective palpability score determination.
Data will be collected, reviewed and investigated by the researchers. Data collection: 1
year; Data processing: 2 months; Statistical analysis: 2 months; Writing the final thesis: 2
months Duration of the study is planned to be up to 2 years starting in 2015.
2. Subjects:
Inclusion criteria:
Women suffering from urinary incontinence during physical exertion proved by clinical
examination.
This study is planned to include 100 patients, 50 women in each group- Serasis and
TVT-Abbrevo, based on the assumption of 50% difference in pain levels between the two
patient's groups.
The exclusion criterion:
1. Women younger than 30 and older than 80 years old.
2. Women who had surgical procedures involving the pelvic floor, either for the treatment
of USI or for Pelvic Organ Prolapse (POP).
3. Women who suffer from advanced POP (POP-Quantification system (POP-Q) stage more than
2).
4. Patients who have absent or incomplete medical records.
5. Women who refuse to participate with the study.
6. Women who are not able to give informed consent or participate with this randomized
research study for any other reason.
3. Variables: Demographic data will be collected such as age, background illness, etc..
Preoperative / Intraoperative /Postoperative data collection: medical charts and records,
questionnaires on quality of life, urogenital and sexual functioning, surgical procedure that
was undertaken, clinical postoperative analysis, pain levels and other intra and
post-operative complications will be evaluated using (VAS).
Pain location, severity, onset and duration will be determined at thorough examination by the
main researcher. The ability to palpate on the polypropylene tape at vaginal examination will
be examined as well (VAS).
The primary outcome measures are the cure or failure of the operation, as well as any adverse
effects such as dyspareunia or pain. This will be based upon interview and questionnaires.
The second outcome measure is the ability to palpate on the polypropylene tape at vaginal
examination.
Statistical methods:
Quantitative data will be presented using mean and standard deviation, median and Ranges,
while qualitative data will be presented using frequencies and percentages. Comparison of
quantity data between the groups will be examined by comparisons tests: Independent sample
t-test or Wilcoxon rank sum test, as appropriate. Qualitative data will be compared among /
between groups using Chi square test or Fisher's exact test, as appropriate. Changes over
time will be examined. Quantity data will be compared by Repeated measurers, Freidman test,
paired sample t-test or Wilcoxon signed ranks test, as appropriate. Ordinal data will be
compared by Freidman test or Wilcoxon signed ranks test, and Qualitative data will be
compared mainly by McNemar test.
Sample size calculation: for recovering sufficient information investigators will need 100
patients for this study in order to meet the power of 80% with the estimation of 50%
difference at pain level.
Estimation of feasibility and safety of the procedures: blood loss (CC), needle passage ease
(VAS).
Estimation of pain level at : intercourse, vaginal examination, and of constant pelvic, thigh
and groin pain follow up 1 month, 3 months and 12 months after the surgery.(VAS) Estimation
of tape palpability: 1 month and 12 months (VAS). Estimation of cure rate: persistent
failure, recurrence, or completely dry - Yes/ NO interview.
;
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