Calcium phosphate in catheter encrustation.


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, NH4MgPO4 X 6H2O, 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.

Cite this paper

@article{Cox1987CalciumPI, title={Calcium phosphate in catheter encrustation.}, author={Alvin J. Cox and John E Harries and David W. L. Hukins and Ashley Kennedy and Trent M. Sutton}, journal={British journal of urology}, year={1987}, volume={59 2}, pages={159-63} }