title: Radial versus femoral access for coronary angiography and intervention in patients with acute coronary syndromes (RIVAL): a randomised, parallel group, multicentre trial.
abstract: BACKGROUND
  Small trials have suggested that radial access for percutaneous coronary intervention (PCI) reduces vascular complications and bleeding compared with femoral access. We aimed to assess whether radial access was superior to femoral access in patients with acute coronary syndromes (ACS) who were undergoing coronary angiography with possible intervention.
  
  
  METHODS
  The RadIal Vs femorAL access for coronary intervention (RIVAL) trial was a randomised, parallel group, multicentre trial. Patients with ACS were randomly assigned (1:1) by a 24 h computerised central automated voice response system to radial or femoral artery access. The primary outcome was a composite of death, myocardial infarction, stroke, or non-coronary artery bypass graft (non-CABG)-related major bleeding at 30 days. Key secondary outcomes were death, myocardial infarction, or stroke; and non-CABG-related major bleeding at 30 days. A masked central committee adjudicated the primary outcome, components of the primary outcome, and stent thrombosis. All other outcomes were as reported by the investigators. Patients and investigators were not masked to treatment allocation. Analyses were by intention to treat. This trial is registered with ClinicalTrials.gov, NCT01014273.
  
  
  RESULTS
  Between June 6, 2006, and Nov 3, 2010, 7021 patients were enrolled from 158 hospitals in 32 countries. 3507 patients were randomly assigned to radial access and 3514 to femoral access. The primary outcome occurred in 128 (3·7%) of 3507 patients in the radial access group compared with 139 (4·0%) of 3514 in the femoral access group (hazard ratio [HR] 0·92, 95% CI 0·72-1·17; p=0·50). Of the six prespecified subgroups, there was a significant interaction for the primary outcome with benefit for radial access in highest tertile volume radial centres (HR 0·49, 95% CI 0·28-0·87; p=0·015) and in patients with ST-segment elevation myocardial infarction (0·60, 0·38-0·94; p=0·026). The rate of death, myocardial infarction, or stroke at 30 days was 112 (3·2%) of 3507 patients in the radial group compared with 114 (3·2%) of 3514 in the femoral group (HR 0·98, 95% CI 0·76-1·28; p=0·90). The rate of non-CABG-related major bleeding at 30 days was 24 (0·7%) of 3507 patients in the radial group compared with 33 (0·9%) of 3514 patients in the femoral group (HR 0·73, 95% CI 0·43-1·23; p=0·23). At 30 days, 42 of 3507 patients in the radial group had large haematoma compared with 106 of 3514 in the femoral group (HR 0·40, 95% CI 0·28-0·57; p<0·0001). Pseudoaneurysm needing closure occurred in seven of 3507 patients in the radial group compared with 23 of 3514 in the femoral group (HR 0·30, 95% CI 0·13-0·71; p=0·006).
  
  
  CONCLUSIONS
  Radial and femoral approaches are both safe and effective for PCI. However, the lower rate of local vascular complications may be a reason to use the radial approach.
  
  
  BACKGROUND
  Sanofi-Aventis, Population Health Research Institute, and Canadian Network for Trials Internationally (CANNeCTIN), an initiative of the Canadian Institutes of Health Research.
authors.affiliation: McMaster University and the Population Health Research Institute, Hamilton Health Sciences, Hamilton, ON, Canada. sanjit.jollly@phri.ca
authors.forename: Sanjit S
authors.initials: SS
authors.lastname: Jolly
authors.forename: Salim
authors.initials: S
authors.lastname: Yusuf
authors.forename: John
authors.initials: J
authors.lastname: Cairns
authors.forename: Kari
authors.initials: K
authors.lastname: Niemelä
authors.forename: Denis
authors.initials: D
authors.lastname: Xavier
authors.forename: Petr
authors.initials: P
authors.lastname: Widimsky
authors.forename: Andrzej
authors.initials: A
authors.lastname: Budaj
authors.forename: Matti
authors.initials: M
authors.lastname: Niemelä
authors.forename: Vicent
authors.initials: V
authors.lastname: Valentin
authors.forename: Basil S
authors.initials: BS
authors.lastname: Lewis
authors.forename: Alvaro
authors.initials: A
authors.lastname: Avezum
authors.forename: Philippe Gabriel
authors.initials: PG
authors.lastname: Steg
authors.forename: Sunil V
authors.initials: SV
authors.lastname: Rao
authors.forename: Peggy
authors.initials: P
authors.lastname: Gao
authors.forename: Rizwan
authors.initials: R
authors.lastname: Afzal
authors.forename: Campbell D
authors.initials: CD
authors.lastname: Joyner
authors.forename: Susan
authors.initials: S
authors.lastname: Chrolavicius
authors.forename: Shamir R
authors.initials: SR
authors.lastname: Mehta
mesh_terms: D054058:Acute Coronary Syndrome / Q000000981:diagnostic imaging / Q000628:therapy*; D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000009:adverse effects / Q000379:methods*; D002406:Catheterization, Peripheral / Q000009:adverse effects / Q000379:methods*; D017023:Coronary Angiography / Q000009:adverse effects / Q000379:methods*; D001026:Coronary Artery Bypass; D005260:Female; D005263:Femoral Artery; D006470:Hemorrhage / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D015425:Myocardial Reperfusion; D017534:Radial Artery; D015607:Stents