6Jarvis W,Edwards J,Culver D,et a l.Noso comial infection rates in adult and pedi atric intensive care units in the united .AMJ Med,1991,91:185
7Henderson DK.Bacteremia due to percuta neous intravascular devices.New York:Chu rchill LivingstonePress,1990,2189
8Adrienne G.Randolph MD,MA,MSc.An evide nce-based approach to central venous cat h eter management to prevent catheterrelat ed infection in critically ill patients. Critical Care Clinics,1998,14(3):411
9Read ML II,Khalil S-AM,et al.The relati onship between the thrombotic and infec tious complications of central venous ca theters.JAMA,1994,271:1014
10Randolph A,Cook D,Gonzales C,et al.Ben efit of heparin use in central venous an d pulmonary catheters:A meta-analysis of randomized controlled trials.Chest,1997 ,113:165