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Increased microbial yield from continuous ambulatory peritoneal dialysis peritonitis effluent after chemical or
Abstract:
The laboratory diagnosis of continuous ambulatory peritoneal dialysis-associated peritonitis is often hindered by either the absence of or the recovery of low numbers of viable microorganisms. This may be the result of sequestration of bacteria within phagocytes. Sonication of clinical specimens prior to culturing or culturing on saponin-containing media resulted in the growth of significantly greater numbers of colonies than standard culturing on conventional media. In addition, the demonstration that microorganisms are sequestered in phagocytes helped to establish the pathogenic nature of such isolates and distinguish them from contaminants even when present in low numbers. A variety of physical and chemical techniques can disrupt phagocytes and improve the sensitivity of laboratory methods used to confirm the diagnosis of peritonitis in continuous ambulatory peritoneal dialysis patients.
Insights
Improving laboratory diagnosis for continuous ambulatory peritoneal dialysis-associated peritonitis is crucial. New methods like sonication enhance microorganism recovery from phagocytes, aiding diagnosis even with low bacterial counts.
Area of Science:
- Medical Microbiology
- Clinical Diagnostics
- Nephrology
Background:
- Diagnosis of continuous ambulatory peritoneal dialysis-associated peritonitis is challenging due to low microbial loads.
- Bacteria sequestration within phagocytes can hinder standard laboratory detection methods.
Purpose of the Study:
- To improve the sensitivity of laboratory diagnosis for peritonitis in continuous ambulatory peritoneal dialysis patients.
- To investigate methods for enhancing the recovery of microorganisms from clinical specimens.
Main Methods:
- Clinical specimens were sonicated before culturing.
- Cultures were performed on saponin-containing media.
- Microorganism sequestration within phagocytes was investigated.
Main Results:
- Sonication and saponin media significantly increased bacterial colony growth compared to standard methods.
- Demonstrated that microorganisms are sequestered within phagocytes.
- Established methods to distinguish low-number pathogens from contaminants.
Conclusions:
- Physical and chemical techniques, such as sonication, can disrupt phagocytes.
- Enhanced laboratory methods improve the detection of microorganisms in peritonitis patients.
- Improved diagnostic sensitivity is vital for effective peritonitis management in CAPD.