Click on image to view larger version.

Figure 4 Effects of inotropic interventions on interventricular pressure gradients (IVPGs) in a healthy volunteer. Ejection IVPG images obtained at baseline (A), during dobutamine (B), esmolol (C), and atropine (D) infusion. White ticks represent ejection onset and end. In the color scale used for visualization, IVPGs above and below the scale limits (±4 mm Hg/cm) are displayed in white and green, respectively. A fixed color scale for all panels has been used to allow a visual comparison among phases as well as with images in Figure 5.