Prediction of response to lithotripsy--the use of scanning electron microscopy and X-ray energy dispersive spectroscopy.
A single urine sample was obtained from each of 38 patients before and immediately after treatment with a Wolf Piezolith 2300. Each sample was analysed for crystals using scanning electron microscopy and X-ray energy dispersive spectroscopy. In all cases it was possible to make a stone diagnosis prior to treatment and there was 100% correlation between the pre- and post-treatment diagnosis. All stones smaller than 90 mm2 on plain X-ray cleared with piezoelectric lithotripsy alone, regardless of composition. Larger stones composed of calcium oxalate were all successfully fragmented, but 5 of 15 mixed or phosphate stones failed to respond.
Cohen
N P
NP
Department of Urology, St Bartholomew's Hospital, London.
Parkhouse
H
H
Scott
M L
ML
Bowsher
W G
WG
Crocker
P
P
Whitfield
H N
HN
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003460:Crystallization; D003555:Cystinuria / Q000652:urine; D005260:Female; D006801:Humans; D008096:Lithotripsy; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D013057:Spectrum Analysis; D014545:Urinary Calculi / Q000628:therapy* / Q000652:urine