title: Discordant PD catheter and effluent culture results. The limited clinical relevance of culturing PD catheters.
abstract: OBJECTIVE
  To determine if discordance in culture results between the effluent and the tip of the peritoneal catheter had an effect on outcome in patients whose peritoneal dialysis (PD) catheter was removed mostly for nonresolving peritonitis. Reasons for and outcomes of PD catheter removal were also analyzed.
  
  
  METHODS
  We retrospectively reviewed the charts of all PD patients with recent peritonitis for which the PD catheter was removed between 1 January 2003 and 30 April 2009. Data including basic demographics, the organism isolated from effluent and from the PD catheter, reason for catheter removal, duration of hospitalization, and development of intra-abdominal collection were extracted as well as mortality within 8 weeks post removal and return to PD after catheter removal.
  
  
  RESULTS
  Fungal peritonitis was the most common reason for PD catheter removal. 20% of the patients developed an intra-abdominal collection. Mortality related to PD catheter removal was low (3/53; 5.6%). The patients (n =53) were divided into 3 groups: group 1 (n = 20) had the same culture result of effluent and catheter tip; group 2 (n = 19) had a negative culture of the catheter tip; and group 3 (n = 14) had different organism(s) growing from effluent and catheter tip. We found no remarkable differences in duration of PD, catheter age, peritonitis rate, or mortality. Patients in group 1 had significantly more fungal peritonitis than the other 2 groups. In only 4 of the 53 patients (7.5%), the anti-infectious management was changed according to the catheter culture result.
  
  
  CONCLUSIONS
  Discordant results between catheter tip culture and effluent culture did not have a significant impact on patient outcome. Sending PD catheters for culture has limited clinical importance.
authors.affiliation: Division of Nephrology,1 University Health Network, University of Toronto, Toronto, Ontario, Canada. tomcor77@gmail.com
authors.forename: Tom
authors.initials: T
authors.lastname: Cornelis
authors.forename: Joanne M
authors.initials: JM
authors.lastname: Bargman
authors.forename: Maggie
authors.initials: M
authors.lastname: Chu
authors.forename: Antigone
authors.initials: A
authors.lastname: Oreopoulos
authors.forename: Saimah
authors.initials: S
authors.lastname: Khan
authors.forename: Dimitrios G
authors.initials: DG
authors.lastname: Oreopoulos
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001419:Bacteria / Q000302:isolation & purification*; D002408:Catheters, Indwelling / Q000382:microbiology*; D015169:Colony Count, Microbial; D020878:Device Removal; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000628:therapy; D008297:Male; D008875:Middle Aged; D010530:Peritoneal Dialysis / Q000009:adverse effects* / Q000295:instrumentation; D010538:Peritonitis / Q000175:diagnosis / Q000382:microbiology* / Q000628:therapy; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors
chemical_list: D000900:Anti-Bacterial Agents