Circulation, Volume 114, Issue 14, 1 1 2006, Pages e526; author reply e527 Letter by Schinkel et al regarding article, "Projected valve area at normal flow rate improves the assessment of stenosis severity in patients with low-flow, low-gradient aortic stenosis: the multicenter TOPAS (Truly or Pseudo-Severe Aortic Stenosis) study". Schinkel AF, Bountioukos M, Poldermans D, Bax JJ