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A prospective evaluation of blood culture versus standard plate techniques for diagnosing peritonitis in continuous
1West Virginia University Medical Center, Morgantown.
Abstract:
Peritonitis remains a major cause of morbidity in patients treated with continuous ambulatory peritoneal dialysis (CAPD). Culture-negative episodes of peritonitis occur at rates of up to 20%, and in part may reflect inadequate culturing techniques of peritoneal effluent. Through a large, prospective study, the improved sensitivity of a blood culture system, when compared with a standard plate technique (P = 0.001), for the detection of bacterial growth in 67 episodes of CAPD peritonitis is demonstrated. Improved recognition of infections caused by gram-positive organisms, primarily Staphylococcus epidermidis, was especially significant using the blood culture system (P = 0.0001). Because of improved sensitivity and a decreased time to organism identification, particularly with infections caused by S epidermidis, the most common cause of bacterial peritonitis in CAPD patients, we suggest that a blood culture system be the standard means of culturing peritoneal fluid in CAPD patients with peritonitis. The lysis-centrifugation system of culturing peritoneal fluid is also discussed in comparison with the blood culture system.
Insights
A blood culture system significantly improves the detection of bacterial peritonitis in continuous ambulatory peritoneal dialysis (CAPD) patients compared to standard methods. This enhanced sensitivity aids in quicker identification of common pathogens like Staphylococcus epidermidis.
Area of Science:
- Nephrology
- Clinical Microbiology
- Infectious Diseases
Background:
- Peritonitis is a significant complication in continuous ambulatory peritoneal dialysis (CAPD).
- Culture-negative peritonitis episodes occur in up to 20% of cases, potentially due to suboptimal culturing techniques.
- Accurate and timely diagnosis of peritonitis is crucial for effective patient management.
Purpose of the Study:
- To compare the sensitivity of a blood culture system versus a standard plate technique for detecting bacterial growth in peritoneal effluent from CAPD patients.
- To evaluate the impact of the blood culture system on the identification of specific bacterial pathogens, particularly Staphylococcus epidermidis.
Main Methods:
- A large, prospective study involving 67 episodes of CAPD peritonitis.
- Comparison of bacterial detection rates between a blood culture system and a standard plate technique.
- Analysis of time to organism identification and pathogen-specific detection rates.
Main Results:
- The blood culture system demonstrated significantly improved sensitivity for detecting bacterial growth compared to the standard plate technique (P = 0.001).
- Improved recognition of gram-positive organisms, especially Staphylococcus epidermidis, was noted with the blood culture system (P = 0.0001).
- The blood culture system reduced the time to organism identification.
Conclusions:
- A blood culture system is recommended as the standard method for culturing peritoneal fluid in CAPD patients with suspected peritonitis.
- The enhanced sensitivity and faster identification of pathogens, particularly Staphylococcus epidermidis, justify its use.
- The lysis-centrifugation system was also considered in comparison to the blood culture system.