In the study titled “Evaluation of urethral orifice cross-section dimensions following perineal urethrostomy in male cats”, 24 male cats with lower urinary tract disease underwent the procedure. The urethral orifice cross-section was estimated by the largest urinary catheter that could be easily inserted through the stoma at three time points: preoperatively, intra-operatively and 12 days postoperatively. Cases of obstruction recurrence and stricture were documented within the six month follow up period.
Uri Segal, corresponding author for the paper, said: “The intraoperative stoma ranged from 1 to 10 (median 10) Fr and the 12-day postoperative stoma ranged from 4 to 10 (median 8) Fr. There was significant reduction of stoma size 12 days postoperatively, compared to the measurements taken intraoperatively.
"Postsurgical stricture formation and re-obstruction was documented in five of 24 (21%) of cats. Obstruction recurrence is probable if the intra-operative stoma size is 8 Fr or less. Furthermore, if the stoma size is 6 Fr or less, re-obstruction is almost certain (all of these cases in the study were re-obstructions). Conversely, an intra-operative stoma of more than 8Fr had a low risk of recurrence.”
Nicola Di Girolamo, editor of JSAP said: “These findings may function as a guiding rule for surgeons performing perineal urethrostomy, by providing an intraoperative measure of how likely re-obstruction and stricture formation is to occur. It should be remembered, however, that the functional urethral stoma cross-section may vary during the urination cycle and the measurements in this study are likely to only represent a fraction of the functional urethral cross-section size.”
The full article can be found in the August issue of the Journal of Small Animal Practice. It can also be read online here: https://onlinelibrary.wiley.com/doi/10.1111/jsap.13148
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