P10-9 Correlation of Hounsfield units and stone volume with LASER time in stone surgery

Published Date: 10th June 2022

Publication Authors: Agarwal K, McCabe JE

Introduction
Time taken for stone disease surgeries are variable and can be unpredictable. Appropriate planning of cases and theatre lists improves efficiency, saves costs, and prevents cancellations. This study aims to determine if Hounsfield units (HU) and stone volume (SV) has a correlation with various factors, in particular LASER time.

Patients and Methods
Patients undergoing ureteroscopy for a ureteric or renal stone over a 10-month period were retrospectively collected and analysed.

Results
41 patients’ data were used for analysis. 19 (46.3%) female and 22 male patients were identified. Mean age was 60.7 years, age range 17-87 years. 24 (58.5%) stones were on the left side. 19 (46.3%) stones were present in the ureter and 22 in the kidneys. 18 (43.9%) patients were stented pre-operatively as an emergency. 39 (95.1%) patients were stented post-operatively.

Statistically significant correlations were identified between HU and LASER time, SV vs LASER time, and SV vs LASER energy (p<0.01). Sub-group analysis between SV ⩽750mm3 and >750mm3 and LASER time was significant, p<0.05 (mean LASER time 26.9 minutes vs to 43.6 minutes respectively). Similar significance was noted in HU categorisation of ⩽1000HU and >1000HU vs LASER time, p<0.05 (mean LASER time 26.5 minutes vs 44.1 minutes respectively).

Conclusion
HU and SV should be incorporated as planning for surgical time for any ureteric or renal stone surgery, and further audits performed after a period of time to ascertain the effects of better theatre utilisation and waiting list reductions.

Agarwal, K; McCabe, J. (2022). P10-9 Correlation of Hounsfield units and stone volume with LASER time in stone surgery. Journal of Clinical Urology. 15(Suppl 1), pp.59-60. [Online]. Available at: https://journals.sagepub.com/doi/10.1177/20514158221077479 [Accessed 16 August 2022]

 

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