title: Validation of 4 French catheters for quantitative coronary analysis: in vivo variability assessment using 6 French guiding catheters as reference scaling devices.
abstract: Although numerous studies have established the utility of 4 F catheters for routine coronary angiography, its adequacy for automatic quantitative coronary analysis has not been previously assessed.
  
  
  METHODS
  In 32 consecutive patients, coronary angiography was performed sequentially with 4 F diagnostic catheters and 6 F guiding catheters after intracoronary nitroglycerin. A total of 43 lesions were evaluated for quantitative analysis using both types of catheter as scaling devices. Possible differences in the reference diameter, minimal luminal diameter and percent diameter stenosis were evaluated. All measurements were performed offline by the same operator and intraobserver variability estimation was performed by repeating the evaluation in 12 lesions randomly selected after 1 month.
  
  
  RESULTS
  The mean reference diameter was 2.98+/-0.48 mm, mean minimal luminal diameter was 1.00+/-0.52 mm and percent diameter stenosis was 67.1+/-15.3%. Accuracy (mean difference of values) was 0.009 mm for reference diameter, 0.005 mm for minimal luminal diameter and 0.25% for percent diameter stenosis. Precision (mean standard deviation of the differences) was 0.17 mm for reference diameter, 0.19 mm for minimal luminal diameter and 5.93% for percent stenosis. Linear correlation for these three variables was 0.94, 0.93 and 0.93, respectively. Intraobserver variability analysis showed similar values for accuracy, precision and linear correlation.
  
  
  CONCLUSIONS
  Angiography with 4 F catheters allows adequate quantification of luminal diameters as compared to most accepted clinical standards. These results may have implications for the selection of diagnostic catheters for routine follow-up assessment of percutaneous coronary interventions.
authors.affiliation: Interventional Cardiology Unit, Hospital Meixoeiro, Meixoeiro s/n, Vigo, Pontevedra, Spain, CP 36200. marcelo.sanmartin.fernandez@sergas.es
authors.forename: Marcelo
authors.initials: M
authors.lastname: Sanmartin
authors.forename: Javier
authors.initials: J
authors.lastname: Goicolea
authors.forename: Raul
authors.initials: R
authors.lastname: Castellanos
authors.forename: Marisol
authors.initials: M
authors.lastname: Bravo
authors.forename: Raymundo
authors.initials: R
authors.lastname: Ocaranza
authors.forename: Diogenes
authors.initials: D
authors.lastname: Cuevas
authors.forename: Ramon
authors.initials: R
authors.lastname: Mantilla
authors.forename: Rafael
authors.initials: R
authors.lastname: Ruiz-Salmeron
mesh_terms: D006328:Cardiac Catheterization / Q000295:instrumentation*; D002404:Catheterization / Q000592:standards*; D017023:Coronary Angiography / Q000295:instrumentation*; D023921:Coronary Stenosis / Q000175:diagnosis; D006801:Humans; D005996:Nitroglycerin / Q000494:pharmacology; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation*; D012016:Reference Values
chemical_list: D005996:Nitroglycerin