Typical value ranges and signal patterns in patients with neurogenic bladder: Quality control in urodynamics using an air-charged catheter system.

Purpose: To establish typical value ranges (TVRs) of the air-charged catheter (ACC) system, and analyze the typical signal patterns (TSPs) of cough under different bladder volumes for quality control of a urodynamic study using the ACC system.

Materials And Methods: The urodynamic traces of 1977 patients with neurogenic bladder (NB) were analyzed for intravesical pressure (p ), abdominal pressure (p ), and detrusor pressure (p ) in the cough test at our center from July 2017 to December 2021. The p cough signals were described and classified. The p cough signal patterns in different bladder volumes and postures were analyzed.

Results: The 50% range of the initial resting p , p , and p in the supine and sitting positions were 7-15, 7-14, and 0-0 cmH O, and 24-33, 24-33, and 0-0 cmH O, respectively. The cough amplitudes for p and p were similar in the 50% range, as follows: 10-27 and 8-25 cmH O in the supine position, respectively; and 18-43 and 17-40 cmH O in the sitting position, respectively. The cough amplitude of p and p was not related to bladder volume (p > 0.05). The cough spikes of p were divided into three types: type I, in which p has a minimal change (<5 cmH O); type II, a monophasic cough spike, in which could be a positive (IIa, ≥5 cmH O) or negative spike (IIb, ≥5 cmH O); and type III, a biphasic spike, in which could be a positive-to-negative biphasic (IIIa) or negative-to-positive spike (IIIb). Under different bladder volumes, the cough signals of p were all expressed as type I, II, or III, and the cough signals were unrelated to bladder volume (p > 0.05).

Conclusions: TVRs of the initial resting state in patients with NB were established to provide guidance for quantitative quality control of the ACC system. The TSPs of the p cough signal under different bladder volume and posture were described, which could be used for qualitative quality control of the ACC system.