In their model, they used BegoStone fragments of either “hard” or “soft” stone composition with sizes ranging from two to four millimeter. A laser fired at the stones vertically for two minutes with constant irrigation at varying pulse types and pulse lengths. The four different measured variables being tested were short pulse, long pulse, Moses contact, and Moses distance.
For the hard stone composition, Dr. Terry found that at 0.5J/70Hz, short pulse and Moses distance settings ablated significantly more than any of the other pulse length and pulse type. The results for the soft stone model yielded significantly more stone ablation at the 0.5J/70Hz and the 0.5J/40Hz energy and frequency level with a short pulse and Moses distance setting. In both situations, significantly more stone was ablated at the 0.5J/70Hz than at any of the other settings.
In conclusion, Dr. Terry found that efficiency on popcorn lithotripsy the best conditions are short pulse and Moses distance at moderate energy and high frequency.
Presented by: Russel Terry, MD, Duke University Medical Center, and Durham VA Health Care System, Durham, North Carolina
Written by: Joshua Tran, (Department of Urology, University of California-Irvine) medical writer for UroToday.com at the American Urological Association's 2019 Annual Meeting (AUA 2019), May 3 – 6, 2019 in Chicago, Illinois