title: Feasibility assessment of aortic valve area in patients with aortic stenosis using a pressure wire through a 4 French system and single femoral arterial access.
abstract: OBJECTIVE
  We sought to determine the safety, success and accuracy of using a pressure wire through a 4 French catheter with single arterial access to determine the aortic valve area in patients with aortic stenosis.
  
  
  BACKGROUND
  Conventional invasive techniques to assess aortic stenosis are associated with procedural risks secondary to bilateral femoral access or the sheath size and reduced accuracy using femoral sheath pressure to replace ascending aortic pressure.
  
  
  METHODS
  Cardiac output was measured using a pulmonary artery catheter. With a 4 French catheter through single femoral access ascending aortic pressure and, with a pressure wire, left ventricular pressure were recorded simultaneously in four patients with aortic stenosis. Likewise, both pressures were recorded using the pullback method. Pressure gradients were determined by both methods and aortic valve area calculated with the Gorlin equation prior to correlation. Of note, patients with significant arrhythmias such as atrial fibrillation or frequent premature atrial or ventricular contractions were excluded to maintain accuracy of the pullback method.
  
  
  RESULTS
  All hemodynamic parameters were successfully obtained in all four patients. The correlation between pressure wire and pullback method was highly significant in this case series (n = 4, r = 0.983, p = 0.017). There were no complications.
  
  
  CONCLUSIONS
  The results suggest that the aortic valve area can be safely and accurately evaluated with a pressure wire using a 4 French system. This novel method could be the preferred method for patients with vascular access limitations.
authors.affiliation: Cardiovascular Division, University of Minnesota, Minneapolis, Minnesota, USA.
authors.forename: Stefan C
authors.initials: SC
authors.lastname: Bertog
authors.forename: Andrew
authors.initials: A
authors.lastname: Smith
authors.forename: Carmelo J
authors.initials: CJ
authors.lastname: Panetta
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001021:Aortic Valve / Q000473:pathology*; D001024:Aortic Valve Stenosis / Q000473:pathology* / Q000503:physiopathology; D002407:Catheterization, Swan-Ganz / Q000379:methods*; D005240:Feasibility Studies; D006801:Humans; D008875:Middle Aged