What question did this study set out to answer?

To evaluate the impact of various Holmium:YAG laser settings and irrigation flow rates on intraureteral temperature using an in vitro model.

October 19, 2017Journal of EndourologyOpen Access

Effect of Laser Settings and Irrigation Rates on Ureteral Temperature During Holmium Laser Lithotripsy, an In Vitro Model

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Authors

DWDaniel WollinBrigham and Women's Hospital ECEvan CarlosDuke Medical Center WTWestin R. TomUniversity of California, San Francisco

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Implication

In vitro simulation reveals reduced irrigation drastically elevates intraureteral temperatures during laser lithotripsy, indicating thermal injury risk.

Key Points

To evaluate the impact of various Holmium:YAG laser settings and irrigation flow rates on intraureteral temperature using an in vitro model.
Simulated ureteroscopic laser lithotripsy using an in vitro tubing system with a 200 μm Holmium:YAG laser fiber fired for 60 seconds.
Tested five laser settings (0.2 J/50 Hz, 0.6 J/6 Hz, 0.8 J/8 Hz, 1 J/10 Hz, and 1 J/20 Hz) across three room-temperature irrigation rates (100, 50, and 0 mL/min).
Measured temperature 1 mm from the fiber tip every 5 seconds in duplicate trials, comparing averaged maximum temperatures via analysis of variance.
At 100 mL/min, only the 1 J/20 Hz setting produced a significantly higher maximum temperature (p < 0.01), reaching a clinically safe peak of 30.7°C.
At 50 mL/min, the 1 J/20 Hz setting exceeded the thermal injury threshold with a maximum temperature of 43.4°C (p < 0.05).
Without irrigation (0 mL/min), all settings surpassed 43°C, with 0.8 J/8 Hz, 1 J/10 Hz, and 1 J/20 Hz significantly higher than lower settings (p < 0.05), peaking above 100°C at 1 J/20 Hz.

Cite This Study

Wollin et al. (2017) studied this question.

synapsesocial.com/papers/6a795ce3756812e3958901d8 https://doi.org/10.1089/end.2017.0658

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Implication

In vitro simulation reveals reduced irrigation drastically elevates intraureteral temperatures during laser lithotripsy, indicating thermal injury risk.

Effect of Laser Settings and Irrigation Rates on Ureteral Temperature During Holmium Laser Lithotripsy, an In Vitro Model

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Member takes

Implication

Key Points

Cite This Study

Effect of Laser Settings and Irrigation Rates on Ureteral Temperature During Holmium Laser Lithotripsy, an In Vitro Model

Discussion

Member takes

Implication

Key Points

Cite This Study

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