Angioplasty guidewire velocity: a new simple method to calculate absolute coronary blood velocity and flow

The American Journal of Cardiology
C M GibsonE M Antman

Abstract

The Thrombolysis In Myocardial Infarction (TIMI) frame count is a relative index of coronary flow that measures time by counting the number of frames required for dye to travel from the ostium to a standardized coronary landmark in a cineangiogram filmed at a known speed (frames/s). We describe a new method to measure distance along arteries so that absolute velocity (length divided by time) and absolute flow (area x velocity) may be calculated in patients undergoing percutaneous transluminal coronary angiography (PTCA). After PTCA, the guidewire tip is placed at the coronary landmark and a Kelly clamp is placed on the guidewire where it exits the Y-adapter. The guidewire tip is then withdrawn to the catheter tip and a second Kelly clamp is placed on the wire where it exits the Y-adapter. The distance between the 2 Kelly clamps outside the body is the distance between the catheter tip and the anatomic landmark inside the body. Velocity (cm/s) may be calculated as this distance (cm) divided by TIMI frame count (frames) x film frame speed (frames/s). Flow (ml/s) may be calculated by multiplying this velocity (cm/s) and the mean cross-sectional lumen area (cm2) along the length of the artery to the TIMI landmark. In 30 patients, v...Continue Reading

Citations

Apr 22, 2008·Journal of Thrombosis and Thrombolysis·Vijayalakshmi KunadianC Michael Gibson
Jun 1, 2000·Australian and New Zealand Journal of Medicine·M J WilliamsN J Restieaux
May 11, 2010·EuroIntervention : Journal of EuroPCR in Collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology·Martin StoelClemens Von Birgelen
Nov 7, 2007·Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions·Martin G StoelFelix Zijlstra
Jun 11, 2003·Circulation·Martin G StoelCees A Visser
Sep 24, 2010·Netherlands Heart Journal : Monthly Journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation·J A J M HermensC von Birgelen
Feb 7, 2001·Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions·L CannonM Gibson

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