(A) Fluoroscopic image of our marker catheter in an anterioposterior projection shows measurements taken from the aortic valve to a line drawn between.

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(A) Fluoroscopic image of our marker catheter in an anterioposterior projection shows measurements taken from the aortic valve to a line drawn between the lower borders of both clavicular heads (inferior border). (A) Fluoroscopic image of our marker catheter in an anterioposterior projection shows measurements taken from the aortic valve to a line drawn between the lower borders of both clavicular heads (inferior border). (B) Fluoroscopic image shows distance from aortic valve to the point to where the catheter reached its most superior excursion (superior border). (C) Fluoroscopic image shows the distance to where the catheter crossed the most distal clavicular border (posterior border). Mohammad Alkhalil et al. Open Heart 2016;3:e000331 ©2016 by British Cardiovascular Society