[In vitro study of the process of urinary calculi fragmentation with endoscopy, light microscopy, and scanning electron microscopy].

Abstract:

:Stones with different compositions respond differently to shock wave lithofragmentation. Likewise, the various lithotrity systems used may have different effects on the stones. To determine the relationships between stone composition and their fragmentation patterns, we conducted an in vitro study using endoscopy, magnifying glass, light microscope and scanning electron microscope on fragments obtained after lithotrity of 60 pure stone with different compositions: calcium oxalate monohydrate and dihydrate (OXMH and OXDH), phosphocarbonate (PC), ammonium magnesium phosphate (AMF) and uric acid (UA). Fragmentation was carried out with 4 different lithofragmenting sources (electrohydraulic, piezoelectric, ultrasound and pulse laser). No morphologic differences in the fractures induced by the various lithofragmenting sources were demonstrated. OXMH and UA stones basically break up by intercrystalline fracture and splitting of their concentric plates. OXDH breaks up mainly by intercrystalline fractures aided by the fibrillar organic material and phosphocarbonates found in the intercrystalline spaces. Fragmentation in infective stones (AMF and PC) occurs across the intercrystalline surfaces and by intracrystalline fracture. Ammonium urate fragments break up by intracrystalline fractures that run across the equatorial plane of its characteristic acicular microspheres.

journal_name

Actas Urol Esp

authors

Tellez Martínez-Fornes M,Burgos Revilla FJ,Soria Descalzo J,Barbero González J,Saez Garrido JC,Del Val Melus MA,Vallejo Herrador J

subject

Has Abstract

pub_date

1997-07-01 00:00:00

pages

675-85

issue

7

eissn

0210-4806

issn

1699-7980

journal_volume

21

pub_type

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