Non-invasive measurement of urinary bladder pressure using condom catheter test was developed since the mid 90s. The test was later modified and repeatedly examined for applicability and reproducibility with success during the last 20 years. We modified the condom cathether test described by Van Mastright for non-invasive measurement of isovolumetric bladder pressure. Modifications were ment to make a simpler test, with no pneumatic controlled valves. We aim to make this prototype faster to reach the isovolumetric bladder pressure.

To test a modified condom catheter test prototype for measurement of transmitted isovolumetric pressure and compare it with invasive isovolumetric pressure using the manual penile compression test (Pinch test).
 A pilot study was performed in 20 adult male patients undergoing urodynamic study for nocturnal enuresis. The patients were consented to undergo stop-flow test and next day the modified condom catheter test. Only patients with no apparent overactivity in pressure-flow study underwent the study. The study was approved by the ethical commity. 
 We used a single outflow condom catheter attached to the penis with a y-shaped connector attached to it. One limb of the Y was attached to pressure transducer and the other limb was used to make the condom air free to avoid artifacts during pressure measurement then was blocked. The condom was stiffened with adhesive tape to lower its compliance and limit its distensibility to maximal capacity of 70-120 ml. The tape was extended to the penile skin to guard against leakage.  The patients were instructed not to strain during voiding and we excluded results associated with any straining. Maximal recorded pressure was designated as Transmitted Isovolumetric pressure. Pressure-flow test was done in another day with interruption of flow during voiding using manual compression of the penis (Pinch test). Isovolumetric pressure was recorded and compared with transmitted isovolumetric pressure of modified condom test. Statistical analysis was done using student t test.

All patients were able to undergo the study. No leakage or excessive distension of the condom occurred. Mean patient age was 21.2+/- 5.1 years. Mean Transmitted isovolumetric pressure was 61.7+/-33 cm/H2O while mean invasive isovolumetric pressure was 70.1+/- 45 cm/H2O. Voided volume ranged between 70 and 120 ml with a mean of 94.3+/-22.8 ml. No obvious morbidity was noticed during the condom test.

No significant difference was found between modified condom catheter test and Pinch test (p<0.005). The test is feasible, safe and quicker to reach isovolumetric pressure.

Isovolumetric bladder pressure can be measured non-invasively using this modified condom catheter. The test shows good correlation with invasive test in young non-obstructed male patients with no appreciated side effects. The test is simpler and quicker. Feasibility of the test should be tested further in larger group of patients.