title: Anticoagulation therapy for the prevention of hemodialysis tunneled cuffed catheters (TCC) thrombosis.
abstract: BACKGROUND
  Chronic oral anticoagulation is currently used to avoid thrombosis and the malfunction of tunneled cuffed catheters (TCCs) for hemodialysis (HD). The aim of the study was to assess the efficacy of early warfarin administration, after TCC placement, in comparison to its administration after the first thrombosis or malfunction event of the TCC.
  
  
  METHODS
  One hundred and forty-four chronic dialysis patients, who underwent TCC placement between June 2001 and June 2005, were randomized into two groups: 81 patients, group A, started oral anticoagulation 12 hr after the TCC placement (target international normalized ratio (INR) 1.8-2.5), in association with ticlopidine 250 mg/die; 63 patients, group B, started warfarin after the first thrombosis/malfunction episode (target INR 1.8-2.5) in association with ticlopidine 250 mg/die. The efficacy of oral anticoagulation therapy in preventing TCC thrombotic complications was evaluated in a 12-month follow-up period, after TCC placement, in terms of: a) the number of patients with thrombotic-malfunction events; b) the number of thrombotic-malfunction events with urokinase infusion (events/patient/year); c) intradialytic blood flow rate (BFR, ml/min); d) negative blood pressure (BP) from the arterial line of the TCC (AP, mmHg); e) positive BP, in the extracorporeal circuit from the venous line (VP, mmHg); and f) bleeding complications.
  
  
  RESULTS
  Ten patients (12%) in group A showed TCC thrombosis/malfunction vs. 33 patients (52%) in group B (p < 0.01). In group A, 0.16 events of thrombosis/malfunction per patient/year vs. 1.65 in group B (p < 0.001) were ob-served. BFR was respectively 305 +/- 34 vs. 246 +/- 42 ml/min (p < 0.001). AP was -124 +/- 13 in group A vs. -174 +/- 21 mmHg in group B (p < 0.05). VP was 112 +/- 28 in group A vs. 168 +/- 41 mmHg in group B (p < 0.05). No patient showed any bleeding events.
  
  
  CONCLUSIONS
  Early warfarin therapy allows a significant reduction in TCC thrombotic complications and an improvement in both arterial and venous fluxes in comparison with the same therapy administered after the first TCC thrombotic/malfunction event. This therapy did not induce any bleeding complications in the patients included in the study.
authors.affiliation: Nephrology, Dialysis and Renal Transplantation Unit, S. Orsola University Hospital, Bologna , Italy. emodia@aosp.bo.it
authors.forename: L
authors.initials: L
authors.lastname: Colì
authors.forename: G
authors.initials: G
authors.lastname: Donati
authors.forename: G
authors.initials: G
authors.lastname: Cianciolo
authors.forename: C
authors.initials: C
authors.lastname: Raimondi
authors.forename: G
authors.initials: G
authors.lastname: Comai
authors.forename: L
authors.initials: L
authors.lastname: Panicali
authors.forename: V
authors.initials: V
authors.lastname: Nastasi
authors.forename: D C
authors.initials: DC
authors.lastname: Cannarile
authors.forename: F
authors.initials: F
authors.lastname: Gozzetti
authors.forename: M
authors.initials: M
authors.lastname: Piccari
authors.forename: S
authors.initials: S
authors.lastname: Stefoni
mesh_terms: D000284:Administration, Oral; D000368:Aged; D000369:Aged, 80 and over; D000925:Anticoagulants / Q000627:therapeutic use*; D015415:Biomarkers / Q000097:blood; D001794:Blood Pressure / Q000187:drug effects; D002408:Catheters, Indwelling / Q000009:adverse effects; D003131:Combined Modality Therapy; D005260:Female; D005343:Fibrinolytic Agents / Q000627:therapeutic use; D005500:Follow-Up Studies; D006495:Heparin, Low-Molecular-Weight / Q000627:therapeutic use; D006801:Humans; D019934:International Normalized Ratio; D007676:Kidney Failure, Chronic / Q000503:physiopathology / Q000628:therapy; D008297:Male; D008875:Middle Aged; D012077:Renal Artery / Q000187:drug effects / Q000503:physiopathology; D012079:Renal Circulation / Q000187:drug effects; D006435:Renal Dialysis / Q000295:instrumentation*; D012082:Renal Veins / Q000187:drug effects / Q000503:physiopathology; D016019:Survival Analysis; D013927:Thrombosis / Q000209:etiology* / Q000503:physiopathology / Q000517:prevention & control*; D013988:Ticlopidine / Q000627:therapeutic use; D013997:Time Factors; D016896:Treatment Outcome; D014859:Warfarin / Q000627:therapeutic use
chemical_list: D000925:Anticoagulants; D015415:Biomarkers; D005343:Fibrinolytic Agents; D006495:Heparin, Low-Molecular-Weight; D014859:Warfarin; D013988:Ticlopidine