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Figure 3: Graphic representation of dP/dt and of the subendocardial viability ratio (SEVR). (a) Graphically, dP/dt Max corresponds to the first derivative of the pressure curve in its ascendant phase. The greater the angle relative to the horizontal axis, the greater the force of ventricular contraction and/or the lower the peripheral vascular resistance. (b) The SEVR is an index of subendocardial perfusion. It is directly proportional to the area under the diastolic curve (AUDC) and inversely proportional to the area under the systolic curve (AUSC). SEVR = AUDC/AUSC 
