Abstract | PURPOSE: MATERIALS AND METHODS: RESULTS: Damage to the 365-microm optical fiber was greatest for irradiation of CHPD, followed by MAPH, and COM (P<0.001). There was no significant optical fiber damage after cystine and uric acid lithotripsy. For the 365-microm optical fiber and CHPD, fragmentation after 200 J was greatest for pulse energies < or =1.0 J (P< 0.001). For other compositions, fragmentation was not statistically different among the power settings for constant irradiation. No significant difference was noted in fragmentation for any composition at different pulse energies (1.0 v. 2.0 J) for 1-kJ irradiation. However, for all compositions, the calculated lithotripsy speed was greatest at high power settings (P<0.001). For the 272-microm optical fiber, CHPD fragmentation was greatest for the 1.0-J pulse energy. The mean fragment size and relative quantity of fragments > or =2 mm both increased as pulse energy increased. CONCLUSIONS:
Optical fiber degradation varies with stone composition, irradiation, and pulse energy. Holmium:YAG lithotripsy speed is maximized with higher power (either increased pulse energy or higher pulse frequency). Because low pulse energy may be safer and yields smaller fragments than high pulse energy, holmium:YAG lithotripsy speed is best increased by using pulse energies < or =1.0 J at a high repetition rate.
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Authors | S S Spore, J M Teichman, N S Corbin, P C Champion, E A Williamson, R D Glickman |
Journal | Journal of endourology
(J Endourol)
Vol. 13
Issue 8
Pg. 559-66
(Oct 1999)
ISSN: 0892-7790 [Print] United States |
PMID | 10597125
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Calcium Phosphates
- Magnesium Compounds
- Phosphates
- alpha-tricalcium phosphate
- tetracalcium phosphate
- Calcium Oxalate
- Uric Acid
- calcium phosphate, monobasic, anhydrous
- calcium phosphate
- Struvite
- Cysteine
- calcium phosphate, dibasic, anhydrous
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Topics |
- Calcium Oxalate
(analysis, radiation effects)
- Calcium Phosphates
(analysis, radiation effects)
- Cysteine
(analysis, radiation effects)
- Fiber Optic Technology
- Humans
- In Vitro Techniques
- Lithotripsy, Laser
(methods)
- Magnesium Compounds
(analysis, radiation effects)
- Optical Fibers
- Phosphates
(analysis, radiation effects)
- Reproducibility of Results
- Struvite
- Uric Acid
(analysis, radiation effects)
- Urinary Calculi
(chemistry, therapy)
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