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Calcium Phosphate in Catheter Encrustation
Author(s) -
COX A. J.,
HARRIES J. E.,
HUKINS D. W. L.,
KENNEDY A. P.,
SUTTON T. M.
Publication year - 1987
Publication title -
british journal of urology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.773
H-Index - 148
eISSN - 1464-410X
pISSN - 0007-1331
DOI - 10.1111/j.1464-410x.1987.tb04810.x
Subject(s) - struvite , calcium , extended x ray absorption fine structure , phosphate , chemistry , spectroscopy , absorption (acoustics) , absorption spectroscopy , atomic absorption spectroscopy , magnesium , infrared spectroscopy , phase (matter) , brushite , ammonium phosphate , crystallography , nuclear chemistry , inorganic chemistry , materials science , biochemistry , organic chemistry , optics , physics , quantum mechanics , composite material , fertilizer
Summary— Encrusted catheters from nine female patients were the source of samples of deposits which were examined by X‐ray diffraction, atomic absorption spectroscopy, infra‐red spectroscopy and extended X‐ray absorption fine structure (EXAFS) spectroscopy. In eight samples the only crystalline phase which could be clearly distinguished by X‐ray diffraction was ammonium magnesium orthophosphate hexahydrate, NH 4 MgPO 4 .6H 2 O, which occurs naturally as the mineral struvite. However, atomic absorption spectroscopy revealed an appreciable concentration of calcium in all samples. Calcium phosphates have previously been detected in catheter deposits. Infra‐red and EXAFS spectra were consistent with the calcium phosphate being present as a poorly crystalline hydroxyapatite. Thus the deposits appear to consist of a mixture of crystalline struvite and a form of hydroxyapatite which is not fully crystalline.