Document Detail

A prospective, randomized, and comparative study of 3 different methods for the diagnosis of intravascular catheter colonization.
MedLine Citation:
PMID:  15791507     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Demonstration of catheter tip colonization is usually performed by use of Maki's semiquantitative technique, although the superiority of quantitative techniques has been claimed on the basis of their purported ability to detect both endoluminal and exoluminal microorganisms. METHODS: We prospectively compared Maki's semiquantitative technique and the quantitative methods of sonication and vortexing for the detection of colonization of intravascular catheter tips and catheter-related bloodstream infections. All 3 techniques were performed on the tip of each catheter, and the order in which each technique was performed was randomly assigned. RESULTS: Of the 1000 catheter tips that were processed, 329 (32.9%) had positive results for at least 1 of the 3 techniques when a breakpoint of >or=100 colony-forming units (cfu)/catheter segment was used for the quantitative techniques and a breakpoint of >or=15 cfu was used for Maki's technique. Eighty-two of the catheter tips for which results were positive were from patients with catheter-related bloodstream infections. For each technique, the likelihood of detection decreased progressively depending on the order in which the technique was performed (i.e., second vs. first and third vs. second). The likelihood of detection of catheter colonization for each technique, when the technique was performed first and when 2 breakpoints (>or=100 cfu/catheter segment [criterion B] and >or=1000 cfu/catheter segment [criterion A]) were used for the quantitative techniques and a breakpoint of >or=15 cfu was used for Maki's technique, was as follows: 99.1% and 100% for Maki's technique, 95.1% and 92.9% for sonication, and 93.1% and 72.8% for vortexing (for criteria B and A, respectively). No inferiority of Maki's technique could be demonstrated when results were compared according to whether catheter placement was short term (i.e., <7 days) or long term (i.e., >or=7 days), either for the detection of colonization or for the detection of catheter-related bloodstream infections. CONCLUSIONS: According to data from the present study, the quantitative techniques of sonication and vortexing were not superior to Maki's technique under the test conditions used. The greater simplicity of Maki's semiquantitative technique makes it the procedure of choice for routine work in the microbiology laboratory.
Emilio Bouza; Neisa Alvarado; Luis Alcalá; Matilde Sánchez-Conde; María Jesús Pérez; Patricia Muñoz; Pablo Martín-Rabadán; Marta Rodríguez-Créixems
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't     Date:  2005-03-17
Journal Detail:
Title:  Clinical infectious diseases : an official publication of the Infectious Diseases Society of America     Volume:  40     ISSN:  1537-6591     ISO Abbreviation:  Clin. Infect. Dis.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-25     Completed Date:  2006-10-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9203213     Medline TA:  Clin Infect Dis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1096-100     Citation Subset:  IM    
Clinical Microbiology and Infectious Diseases Department, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
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MeSH Terms
Bacterial Infections / diagnosis*
Catheters, Indwelling / microbiology*
Equipment Contamination*
Predictive Value of Tests
Sensitivity and Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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