MICROBIOLOGICAL DIAGNOSIS OF CATHETER ASSOCIATED INFECTIONS-
A question to postgraduates in Pathology /Laboratory medicine in European union We receive few intravascular catheters for evaluation of infections from many critical care patients, every catheter we insert has some risk of systemic infection with involvement of blood stream with all percutaneous catheters are associated with risk of (skin) exit site infection and subsequent migration of that infection along the extraluminal catheter surface to the bloodstream. . Bacterial or fungal contamination of a catheter hub can also lead to intraluminal infection of the catheter and extension of that infection to the bloodstream.
MICROBIOLOGY MATTERS - The leading causes of CRBSI in descending order of frequency are staphylococci (both Staphylococcus aureus and the coagulase-negative staphylococci), enterococci, aerobic Gram-negative bacilli and yeast. When aerobic Gram-negative bacilli are assessed as a group, their frequency follows that of the staphylococci
Quantitative culture of the distal (5 cm) tip of central venous and arterial catheters should be performed when they are removed for suspected infection. The tip of the introducer should be sent for culture when a pulmonary artery line is removed. For patients with short-term central venous catheters without severe sepsis or shock, in whom the index of suspicion for catheter-related infection is moderate or less, the catheter may be exchanged over a guide wire for a new catheter allowing culture of the tip of the removed catheter without immediately sacrificing the site of insertion (The clinicians or phlebotomist s would do the matters with asepsis )
ESATBLISHED AND REVIWED STANDARS - positive culture with the same microorganism of either:
quantitative CVC culture ≥ 103 CFU/ml or semi-quantitative CVC culture > 15 CFU; quantitative blood culture ratio CVC blood sample/peripheral blood sample > ;differential delay of positivity of blood cultures: CVC blood sample culture positive two hours or more before peripheral blood culture (blood samples drawn at the same time);positive culture with the same microorganism from pus from insertion site. NEED FOR BLOOD CULTRUING At least 2 blood cultures should be obtained when catheter infection is suspected. When the tip of a catheter is sent for culture, the 2 blood cultures may be obtained by peripheral venipuncture. Alternatively, or when culture of the tip of the catheter is not performed, blood culture should be obtained by peripheral venipuncture and at least blood culture should be obtained from a lumen of the catheter. A recent study has found that for multilumen catheters, drawing multiple catheter blood cultures, one from each lumen of the catheter suspected of infection, in addition to blood culture obtained by peripheral venipuncture will enhance detection of catheter infection.
Currently, most hospital microbiology laboratories use automated systems for detecting growth in incubating blood cultures
A diagnosis of CRBSI is achieved by any of the following 3 criteria:
same organism recovered from percutaneous blood culture and from quantitative (>15 colony-forming units) culture of the catheter tip; same organism recovered from a percutaneous and a catheter lumen blood culture, with growth detected 2 hours sooner (ie, 2 hours less incubation) in the latter; same organism recovered from a quantitative percutaneous and a catheter lumen blood culture, with 3-fold greater colony count in the latter
Some hospitals report multiple cases of Catheter associated infection when the matters on aseptic precautions are neglect or under performed, the correction needs the understanding of pathophysiology and need proper caring technical and clinical staff WITH DEDICATED HAND WASH AND PROPER GLOVING WITH USE OF EFFECTIVE ANTISEPTIC AGENTS
All the critical care units should develop their own Standard operating procedures on the matters with effective training for all the staff and reviewed CME’s on matters
ARTICLE FOR REOSURCE AND BETTER UNDERSTANING LEARN FROM FULL TEXT
1 Intravascular Catheter-Related Bloodstream Infection Harshal Shah, Neurohospitalist. 2013 Jul; 3(3): 144–151. NCBI
2 Catheter-Related Infection ARTICLES - WIKI
Formulated for European on-line education on infectious diseases
Dr.T.V.Rao MD
A question to postgraduates in Pathology /Laboratory medicine in European union We receive few intravascular catheters for evaluation of infections from many critical care patients, every catheter we insert has some risk of systemic infection with involvement of blood stream with all percutaneous catheters are associated with risk of (skin) exit site infection and subsequent migration of that infection along the extraluminal catheter surface to the bloodstream. . Bacterial or fungal contamination of a catheter hub can also lead to intraluminal infection of the catheter and extension of that infection to the bloodstream.
MICROBIOLOGY MATTERS - The leading causes of CRBSI in descending order of frequency are staphylococci (both Staphylococcus aureus and the coagulase-negative staphylococci), enterococci, aerobic Gram-negative bacilli and yeast. When aerobic Gram-negative bacilli are assessed as a group, their frequency follows that of the staphylococci
Quantitative culture of the distal (5 cm) tip of central venous and arterial catheters should be performed when they are removed for suspected infection. The tip of the introducer should be sent for culture when a pulmonary artery line is removed. For patients with short-term central venous catheters without severe sepsis or shock, in whom the index of suspicion for catheter-related infection is moderate or less, the catheter may be exchanged over a guide wire for a new catheter allowing culture of the tip of the removed catheter without immediately sacrificing the site of insertion (The clinicians or phlebotomist s would do the matters with asepsis )
ESATBLISHED AND REVIWED STANDARS - positive culture with the same microorganism of either:
quantitative CVC culture ≥ 103 CFU/ml or semi-quantitative CVC culture > 15 CFU; quantitative blood culture ratio CVC blood sample/peripheral blood sample > ;differential delay of positivity of blood cultures: CVC blood sample culture positive two hours or more before peripheral blood culture (blood samples drawn at the same time);positive culture with the same microorganism from pus from insertion site. NEED FOR BLOOD CULTRUING At least 2 blood cultures should be obtained when catheter infection is suspected. When the tip of a catheter is sent for culture, the 2 blood cultures may be obtained by peripheral venipuncture. Alternatively, or when culture of the tip of the catheter is not performed, blood culture should be obtained by peripheral venipuncture and at least blood culture should be obtained from a lumen of the catheter. A recent study has found that for multilumen catheters, drawing multiple catheter blood cultures, one from each lumen of the catheter suspected of infection, in addition to blood culture obtained by peripheral venipuncture will enhance detection of catheter infection.
Currently, most hospital microbiology laboratories use automated systems for detecting growth in incubating blood cultures
A diagnosis of CRBSI is achieved by any of the following 3 criteria:
same organism recovered from percutaneous blood culture and from quantitative (>15 colony-forming units) culture of the catheter tip; same organism recovered from a percutaneous and a catheter lumen blood culture, with growth detected 2 hours sooner (ie, 2 hours less incubation) in the latter; same organism recovered from a quantitative percutaneous and a catheter lumen blood culture, with 3-fold greater colony count in the latter
Some hospitals report multiple cases of Catheter associated infection when the matters on aseptic precautions are neglect or under performed, the correction needs the understanding of pathophysiology and need proper caring technical and clinical staff WITH DEDICATED HAND WASH AND PROPER GLOVING WITH USE OF EFFECTIVE ANTISEPTIC AGENTS
All the critical care units should develop their own Standard operating procedures on the matters with effective training for all the staff and reviewed CME’s on matters
ARTICLE FOR REOSURCE AND BETTER UNDERSTANING LEARN FROM FULL TEXT
1 Intravascular Catheter-Related Bloodstream Infection Harshal Shah, Neurohospitalist. 2013 Jul; 3(3): 144–151. NCBI
2 Catheter-Related Infection ARTICLES - WIKI
Formulated for European on-line education on infectious diseases
Dr.T.V.Rao MD
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