Temporal development of unfavourable urodynamic parameters during the first year after spinal cord injury

Objectives To describe the temporal development of and risk factors for the occurrence of unfavourable urodynamic parameters during the first year after spinal cord injury (SCI). Patients and Methods This population‐based longitudinal study used data from 97 adult patients with a single‐event traumatic or ischaemic SCI who underwent video‐urodynamic investigation (UDI) at a university SCI centre. The first occurrences of unfavourable urodynamic parameters (detrusor overactivity combined with detrusor sphincter dyssynergia DO‐DSD, maximum storage detrusor pressure ≥40 cmH 2 O, bladder compliance <20 mL/cmH 2 O, vesico‐ureteric reflux VUR and any unfavourable parameter composite outcome) were evaluated using time‐to‐event analysis. Results The majority of the population (87/97 90%) had at least one unfavourable urodynamic parameter. Most unfavourable urodynamic parameters were initially identified during the 1‐ or 3‐month UDI, including 92% of the DO‐DSD (78/85), 82% of the maximum storage pressure ≥40 cmH 2 O (31/38), and 100% of the VUR (seven of seven) observations. No low bladder compliance was observed. The risk of DO‐DSD was elevated in patients with thoracic SCI compared to those with lumbar SCI (adjusted hazard ratio aHR 2.38, 95% confidence interval CI 1.16–4.89). Risk of maximum storage detrusor pressure ≥40 cmH 2 O was higher in males than females (aHR 8.33, 95% CI 2.51–27.66), in patients with a cervical SCI compared to those with lumbar SCI (aHR 14.89, 95% CI 3.28–67.55), and in patients with AIS Grade B or C compared to AIS Grade D SCI (aHR 6.17, 95% CI 1.78–21.39). No risk factors were identified for the composite outcome of any unfavourable urodynamic parameter. Conclusions The first UDI should take place within 3 months after SCI as to facilitate early diagnosis of unfavourable urodynamic parameters and timely treatment. Neuro‐urological guidelines and individualised management strategies for patients with SCI may be strengthened by considering sex and SCI characteristics in the scheduling of UDIs.