• Jamie Drossaerts, Kevin L J Rademakers, Sajjad M Rahnama'i, Tom Marcelissen, Philip Van Kerrebroeck, and Gommert van Koeveringe.
• Department of Urology, Maastricht University Medical Centre (MUMC+), Maastricht, The Netherlands, j.drossaerts@outlook.com.
• Urol. Int. 2019 Jan 1; 102 (3): 299-305.

ObjectivesTo assess the improvement of symptoms by sacral neuromodulation (SNM) in an objective way by carrying out an ambulatory urodynamic study (ambulatory-UDS). Until now, successful treatment has been defined as a ≥50% improvement recorded on voiding diaries. Voiding diaries are a patient reported outcome tool. A tool with less bias is desired to evaluate the treatment results before an expensive permanent system is implanted.MethodsBetween 2002 and 2015, a total of 334 patients with lower urinary tract symptoms were included consecutively in an ambulatory-UDS database. From this database, a subgroup of patients was selected which underwent SNM.ResultsIn 51 patients, an ambulatory-UDS was performed both at baseline and during the SNM test period. A positive treatment outcome after test stimulation based on the patients' voiding diary, correlated (p < 0.0001) with an improvement on ambulatory-UDS. Twenty-six of the 30 patients, who have showed improvement of more than 50% on voiding diary parameters and who had subjective improvement of their symptoms, showed an early improvement on ambulatory-UDS.ConclusionsAmbulatory-UDS can be used in clinical decision making, as it is associated with voiding diary improvement during the SNM test period. Using ambulatory-UDS to confirm success could in the future justify the shortening of the test period.© 2019 The Author(s) Published by S. Karger AG, Basel.

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