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  • Title: A randomized comparison of microtip and air-charged catheter for the measurement of maximum urethral closure pressure.
    Author: Mueller MM, Baumann MU, Mueller MD, Kuhn A.
    Journal: Ginekol Pol; 2012 Aug; 83(8):586-9. PubMed ID: 23342881.
    Abstract:
    BACKGROUND: Measurements of maximum urethral closure pressure (MUCP) are a part of urodynamic investigations preceding an incontinence surgery and a part of urethral function tests. OBJECTIVES: The aim of the study was to compare maximum urethral closure pressure determined by a microtip catheter with those measured by an air-charged catheter. MATERIAL AND METHODS: A prospective randomized study in a tertiary referral centre. 122 female patients with urodynamic stress incontinence were randomly assigned to have their urethral pressure profiles measured at rest by both microtip and air-charged catheters. INTERVENTION AND MEASUREMENTS: Each patient had three measurements taken by each catheter type. Means of the measurements were compared with regard to correlation and repeatability. For statistical analysis, an approach proposed by Bland-Altman was applied to assess the agreement between the two techniques. RESULTS: Correlation coefficient between MUCP by the air-charged and the microtip catheter was r=0.8507 (95% CI 0.7928 - 0.8934; p<0.0001). MUCP by the air-charged catheter was significantly lower than MUCP measured by the microtip catheter. The two-tailed p value was <0.0001, considered extremely significant. (95% CI of the differences; mean difference = -3.033; mean of paired differences -3.730 to -2.335). Discrepancies between measurements of the microtip and the air-charged catheters suggest good agreement between the two catheters since the mean difference was 2.8 cmH2O and the 95% CI of agreement were narrow with -0.03319 to 0.3151. CONCLUSION: Air-charged catheters give lower readings for MUCP than microtip catheters with a good agreement between the two catheters.
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