Does stone entrapment with â³Uro-Netâ³ improve Ho:YAG laser lithotripsy efficiency in percutaneous nephrolithotomy and cystolithopaxy?: an in vitro study.
Int Braz J Urol
; 39(4): 579-86, 2013.
Article
em En
| MEDLINE
| ID: mdl-24054387
ABSTRACT
PURPOSE:
to test the effect of stone entrapment on laser lithotripsy efficiency. MATERIALS ANDMETHODS:
Spherical stone phantoms were created using the BegoStone® plaster. Lithotripsy of one stone (1.0 g) per test jar was performed with HoYAG laser (365 µm fiber; 1 minute/trial). Four laser settings were tested I-0.8 J,8 Hz; II-0.2J,50 Hz; III-0.5 J,50 Hz; IV-1.5 J,40 Hz. Uro-Net (US Endoscopy) deployment was used in 3/9 trials. Post-treatment, stone fragments were strained though a 1mm sieve; after a 7-day drying period fragments and unfragmented stone were weighed. Uro-Net nylon mesh and wire frame resistance were tested (laser fired for 30s). All nets used were evaluated for functionality and strength (compared to 10 new nets). Student's T test was used to compare the studied parameters; significance was set at p < 0.05.RESULTS:
Laser settings I and II caused less damage to the net overall; the mesh and wire frame had worst injuries with setting IV; setting III had an intermediate outcome; 42% of nets were rendered unusable and excluded from strength analysis. There was no difference in mean strength between used functional nets and non-used devices (8.05 vs. 7.45 lbs, respectively; p = 0.14). Setting IV was the most efficient for lithotripsy (1.9 ± 0.6 mg/s; p < 0.001) with or without net stabilization; setting III was superior to I and II only if a net was not used.CONCLUSIONS:
Laser lithotripsy is not optimized by stone entrapment with a net retrieval device which may be damaged by high energy laser settings.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nefrostomia Percutânea
/
Cálculos Urinários
/
Litotripsia a Laser
/
Lasers de Estado Sólido
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article