| Holmium: YAG lithotripsy: photothermal mechanism. | |
| | |
MedLine Citation:
|
PMID: 10360498 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
OBJECTIVE: A series of experiments were conducted to test the hypothesis that the mechanism of holmium:YAG lithotripsy is photothermal. METHODS AND RESULTS: To show that holmium:YAG lithotripsy requires direct absorption of optical energy, stone loss was compared for 150 J Ho:YAG lithotripsy of calcium oxalate monohydrate (COM) stones for hydrated stones irradiated in water (17+/-3 mg) and hydrated stones irradiated in air (25+/-9 mg) v dehydrated stones irradiated in air (40+/-12 mg) (P < 0.001). To show that Ho:YAG lithotripsy occurs prior to vapor bubble collapse, the dynamics of lithotripsy in water and vapor bubble formation were documented with video flash photography. Holmium:YAG lithotripsy began at 60 microsec, prior to vapor bubble collapse. To show that Ho:YAG lithotripsy is fundamentally related to stone temperature, cystine, and COM mass loss was compared for stones initially at room temperature (approximately 23 degrees C) v frozen stones ablated within 2 minutes after removal from the freezer. Cystine and COM mass losses were greater for stones starting at room temperature than cold (P < or = 0.05). To show that Ho:YAG lithotripsy involves a thermochemical reaction, composition analysis was done before and after lithotripsy. Postlithotripsy, COM yielded calcium carbonate; cystine yielded cysteine and free sulfur; calcium hydrogen phosphate dihydrate yielded calcium pyrophosphate; magnesium ammonium phosphate yielded ammonium carbonate and magnesium carbonate; and uric acid yielded cyanide. To show that Ho:YAG lithotripsy does not create significant shockwaves, pressure transients were measured during lithotripsy using needle hydrophones. Peak pressures were <2 bars. CONCLUSION: The primary mechanism of Ho:YAG lithotripsy is photothermal. There are no significant photoacoustic effects. |
| | |
Authors:
|
G J Vassar; K F Chan; J M Teichman; R D Glickman; S T Weintraub; T J Pfefer; A J Welch |
Related Documents
:
|
17006508 - Infall of gas as the formation mechanism of stars up to 20 times more massive than the ... 20648528 - Water quality concerns and acceptance of irradiated food: a pilot study on mexican cons... 16804558 - Evaluation of external radiation dosimetry records at the savannah river site, 1951-1989. 3393878 - Comparison between two power-frequency electric-field dosimeters. 23434938 - Vertical sleeve gastrectomy is effective in two genetic mouse models of glucagon-like p... 7782948 - Supranutritional administration of vitamins e and c improves oxidative stability of beef. |
Publication Detail:
|
Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
|
Title: Journal of endourology / Endourological Society Volume: 13 ISSN: 0892-7790 ISO Abbreviation: J. Endourol. Publication Date: 1999 Apr |
Date Detail:
|
Created Date: 1999-08-11 Completed Date: 1999-08-11 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 8807503 Medline TA: J Endourol Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 181-90 Citation Subset: IM |
Affiliation:
|
Division of Urology, The University of Texas Health Science Center, San Antonio, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Analysis of Variance Calculi / therapy* Holmium Hot Temperature* Humans Lithotripsy, Laser / methods* Photochemistry* Pressure Video Recording Yttrium |
| Chemical | |
Reg. No./Substance:
|
7440-60-0/Holmium; 7440-65-5/Yttrium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Almost totally tubeless percutaneous nephrolithotomy: further evolution of the technique.
Next Document: Geometry of laparoscopic suturing and knotting techniques.