1. Dynamic Evaluation of the 21-mm Medtronic Intact Aortic Bioprosthesis by Dobutamine Echocardiography 
Isaac Kadir, FRCS, Mohammad Bashar Izzat, FRCS, Peter Wilde, FRCR, Barnaby Reeves, DPhil, Alan J Bryan, FRCS, Gianni D Angelini, FRCS 
The Annals of Thoracic Surgery 
Volume 63, Issue 4, Pages (April 1997)
DOI: /S (97)

2. Fig. 1
The Medtronic Intact valve. (A) Annulus diameter = 21 mm. (B) Sewing ring diameter = 27 mm. (C) Aortic profile = 15.7 mm. The minimum calibrated orifice area is 1.25 cm2.
The Annals of Thoracic Surgery  , DOI: ( /S (97) )

3. Fig. 2
Increase in systolic valve flow and mean transprosthetic gradient with increasing doses of dobutamine. Data are presented as mean ± standard error.
The Annals of Thoracic Surgery  , DOI: ( /S (97) )