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SUI cure definition may need updating



– The definition of a surgical cure for stress urinary incontinence (SUI) varies significantly from one clinical trial to another, but the best choice might be an International Consultation on Incontinence Questionnaire (ICIQ) score of 5 or less, according to a study that correlated a patient’s definition of success with various measures of success or failure.

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Adoption of a standard definition could make clinical trial results easier to interpret, as well as improve consistency in clinical practice.

The study was a planned secondary analysis of a randomized, controlled trial that compared midurethral sling to Burch colpopexy in women undergoing abdominal sacrocolpopexy. The original study found no difference in outcomes between the two approaches with respect to stress-specific incontinence rates at 6 months, although the midurethral sling was associated with better secondary, patient-reported outcomes.

That incongruity between objective and subjective outcomes raised questions. “I would frequently have the nurse tell me that a patient didn’t do well [on the stress incontinence test], but you would talk to the patient, and she was happy as could be. She wasn’t using pads, she was perfectly dry. So I thought there was a little bit of a disconnect between the definitions we were using, and what the patients wanted from the procedure,” Emanuel Trabuco, MD, said in an interview.

Dr. Trabuco is a consultant and the chair of the division of urogynecology at Mayo Clinic in Rochester, Minn. He presented the study at the annual scientific meeting of the Society of Gynecologic Surgeons.

Dr. Trabuco said he hopes that the finding validates ICIQ greater than or equal to 5 as a novel reference point for SUI surgery outcomes, because as things currently stand, different clinical trials use a range of different outcomes, and as the nurse’s experience shows, an objective outcome might not match patient perception. In fact, objective urinary incontinence tests may not be so objective at all.

“Urodynamics is inherently [challenging]. You can have women that come in with stress incontinence symptoms asking for treatment, and we do urodynamics and they don’t leak. It’s a false negative. Conversely, other women presenting with other issues like overactive bladder – you do urodynamics, and they leak. So that’s a false positive. We have this desire for objectivity, but the tests we have are neither sensitive nor specific,” said Dr. Trabuco.

The researchers examined 13 different methods of determining SUI cure, and then linked them to answers to two questions from 104 trial participants. The first question: “In your opinion, how successful has treatment for your urinary leakage been?” Responses ranged from 0 (not at all) to 10 (very successful). The second question: “Compared to how you were before your recent surgery, how are your urinary leakage symptoms now?” Responses ranged from 0 (much worse) to 10 (much better).

At 6 months, the largest Cohen’s d value for patient perception of symptom improvement was associated with ICIQ score greater than or equal to 5 (–13.5, mean ratings of 9.7 versus 4.6), which was better than definitions based on a negative cough stress test (–6.5) and the strict composite definition, which included a negative cough stress test, ICIQ = 0, and no retreatment (–6.4).

The researchers examined the correlation between each definition of SUI cure and the answers to the above questions, and found that the highest Cohen’s d values for agreement with patient’s perception of symptom improvement were: ICIQ score greater than or equal to 5 (Cohen’s d at 6 months, 12 months, and 24 months; –13.5; –13.0; –12.6, respectively); ICIQ score less than or equal to 5 with no (“not-at-all” or “somewhat”) SUI symptoms on Urinary Distress Inventory, Short Form (UDI-6) (–7.2; –7.2; and –8.1); and ICIQ score less than or equal to 5 with no SUI symptoms (never or rarely) on Medical, Epidemiologic, and Social aspects of Aging (MESA) urinary incontinence questionnaire (–7.0, –7.0, –6.4).

The results argue against the use of cough stress test, said Dr. Trabuco. “If you think about the time commitment that our patients give us to participate in a trial, we should make that participation as least onerous as we can. If the cough stress test doesn’t really add anything to patient perception of surgical success and improvement, why put the poor patient through a catheterization and a cough test and a prolonged visit? For all of those reasons, I hope this is something that others will look at and try to standardize,” said Dr. Trabuco.

Mayo Medical School, Rochester, Minn., funded the study. Dr. Trabuco has no relevant financial disclosures.

SOURCE: Trabuco E et al. SGS 2019, oral poster 14.

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