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Parameters of successful sacral root neuromodulation of the pelvic floor: a retrospective study

A. Bin Mahfooz, N. Elmayergi, M. Abdelhady, Y. Wang, M. Hassouna

Division of Urology, Toronto Western Hospital, University Health Network, University of Toronto, Toronto, Ontario, Canada
Address correspondence to Magdy M. Hassouna, MD, Division of Urology, Toronto Western Hospital, 399 Bathurst Street, MP 8-306, Toronto, Ontario M5T 2S8 Canada

Canadian Journal of Urology 2004, 11(3), 2303-2308.

Abstract

Introduction/objective: Neuromodulation of the pelvic floor (InterStim®) is a relatively new technique in the field of urology. We present our observations for effective neuromodulation on our patient population.
Materials and methods: In a retrospective case review study, we studied the charts of 67 patients, who underwent InterStim® operations between the years 1993 to 2002. All 67 patients had a good response to InterStim®. Patients with inefficient or inconclusive responses were not included in the study. All the relevant patient data was recorded from their charts. For each patient, the following was recorded; the amplitude in volts, the pulse width (in microseconds) and rate, the mode (cycling versus continuous), the electrodes and their position, the load impedance, and the change in amplitude over time.
Results: Amplitude over time showed an initial plateau, followed by a small increase that gets larger.
Conclusions: Long-term management of InterStim® recipients requires increasing amplitude following the implantation of the InterStim® to maintain the same satisfactory levels of urinary control.

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