title: Vascular access stenosis and central vein obstruction interventions: five years of experience in Ramathibodi Hospital.
abstract: OBJECTIVE
  To evaluate initial post-treatment and six months outcome of patients sent to the intervention radiology unit with vascular access malfunctions.
  
  
  METHODS
  A retrospective study of venoplasty, venoplasty with stenting, and venoplasty with thrombolysis for vascular access failure patients, included 53 patients with 67 interventional radiology procedures at the intervention radiology unit of Ramathibodi Hospital between January 2004 and June 2009.
  
  
  RESULTS
  Sixty-seven intervention procedures were performed in 53 patients. Two patients had severe stenosis of AVF anastomosis with a resulting in failure to perform venoplasty. There were 34 lesions of central venous obstruction. The lesions were usually short and 79% shorter than 4.0 cm. In the group of central venous obstruction that performed venoplasty alone, the degree of stenosis was 58.7 +/- 18.6% (mean +/- SD) with 69.2% technical success and 84.6% clinical successes. However the technical success was increased to 71.4% and clinical success was increased to 100% in the stent placement group. At the six-month follow-up, there was no significant clinical re-obstruction. Fair to good outcomes of interventional procedures of vascular access and peripheral venous stenosis were achieved. Within the group of 14 lesions of patients who underwent AVBG, the degree of stenosis was 64.4 +/- 14.4% with 57.1% technical success and 100% clinical successes. In the other group of 19 lesions that underwent native AVF the degree of stenosis was 61 +/- 9.4% with 52.6% technical success and 89% clinical successes. Two patients had re-stenosis and thrombosis in AVBG six months after treatment procedure.
  
  
  CONCLUSIONS
  Percutaneous interventional radiology procedure continues to play a beneficial role in treatment, and remains the first treatment of choice in vascular access malfunction and corollary complications of central venous obstruction. The technical success rate of treatments is determined by morphologic features of each lesion, with the identification of these features helping in proper planning and the use of appropriate instruments.
authors.affiliation: Division of Body Intervention, Department of Radiology, Ramathibodi Hospital, Mahidol University Bangkok, Thailand. rajtp@mahidol.ac.th
authors.forename: Jiemjit
authors.initials: J
authors.lastname: Tapaneeyakorn
authors.forename: Thanipa
authors.initials: T
authors.lastname: Inman
authors.forename: Tanapong
authors.initials: T
authors.lastname: Panpikul
authors.forename: Banjongsak
authors.initials: B
authors.lastname: Wedsart
authors.forename: Jesada
authors.initials: J
authors.lastname: Suvikrom
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001166:Arteriovenous Shunt, Surgical / Q000009:adverse effects; D061807:Catheter Obstruction; D002405:Catheterization, Central Venous / Q000009:adverse effects*; D002406:Catheterization, Peripheral / Q000009:adverse effects; D002408:Catheters, Indwelling; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D015641:Radiography, Interventional; D015607:Stents; D014680:Veins / Q000601:surgery