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Calcium phosphate in catheter encrustation.
British Journal of Urology
|February 1, 1987
Summary
Catheter encrustations primarily contain crystalline struvite and poorly crystalline hydroxyapatite, identified using advanced spectroscopy. These findings shed light on the mineral composition of catheter-associated deposits.
Area of Science:
- Materials Science
- Biomedical Engineering
- Analytical Chemistry
Background:
- Catheter encrustations are a common clinical problem.
- The exact mineral composition of these deposits is not fully understood.
- Previous studies have indicated the presence of calcium phosphates.
Purpose of the Study:
- To characterize the mineral composition of encrusted urinary catheters.
- To identify crystalline and non-crystalline phases in catheter deposits.
- To elucidate the chemical makeup of catheter encrustations.
Main Methods:
- X-ray diffraction (XRD) for crystalline phase identification.
- Atomic absorption spectroscopy (AAS) for elemental analysis.
- Infra-red (IR) and extended X-ray absorption fine structure (EXAFS) spectroscopy for structural characterization.
Main Results:
- Eight of nine samples predominantly showed crystalline struvite (ammonium magnesium orthophosphate hexahydrate).
- All samples contained significant concentrations of calcium.
- Spectroscopic analysis indicated the presence of poorly crystalline hydroxyapatite alongside struvite.
Conclusions:
- Urinary catheter encrustations are typically a composite of crystalline struvite and non-crystalline hydroxyapatite.
- Understanding this composition is crucial for developing strategies to prevent encrustation.
- The study highlights the utility of multi-spectroscopic techniques in analyzing complex biomaterials.