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Erbium: YAG versus holmium:YAG lithotripsy
J M Teichman1, K F Chan, P P Cecconi
1Division of Urology, Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas, USA.
The Journal of Urology
|February 15, 2001
Summary
Erbium:YAG (Er:YAG) lithotripsy demonstrates superior efficiency in breaking down kidney stones compared to holmium:YAG (Ho:YAG) lithotripsy. This finding suggests Er:YAG laser is a more effective tool for stone fragmentation.
Area of Science:
- Urology
- Laser Medicine
- Biomedical Engineering
Background:
- Kidney stones (calculi) pose a significant health challenge.
- Lithotripsy is a common procedure for breaking down kidney stones.
- Comparing laser lithotripsy technologies is crucial for optimizing treatment.
Purpose of the Study:
- To evaluate the comparative efficiency of erbium:YAG (Er:YAG) versus holmium:YAG (Ho:YAG) lithotripsy.
- To test the hypothesis that Er:YAG lithotripsy is more efficient than Ho:YAG lithotripsy.
Main Methods:
- Human calculi (calcium oxalate monohydrate and cystine) were irradiated in water using Er:YAG and Ho:YAG lasers.
- Specific laser parameters and optical fiber types were utilized for each laser.
- Fragmentation was quantified and normalized for incident laser fluence.
Main Results:
- Er:YAG lithotripsy showed significantly higher mean fragmentation for calcium oxalate monohydrate compared to Ho:YAG.
- Normalized fragmentation efficiency was greater for Er:YAG (53.6 g-µm²/J) than Ho:YAG (22.6 g-µm²/J).
- Er:YAG also demonstrated superior fragmentation for cystine calculi.
Conclusions:
- Er:YAG lithotripsy is more efficient than Ho:YAG lithotripsy for the tested stone compositions.
- These findings support the use of Er:YAG laser technology for enhanced stone fragmentation efficacy.
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