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Figure 3: Graphic representation of dP/dt and of the sub-endocardial 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 sub-endocardial 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

Figure 3:  Graphic representation of d<i>P</i>/d<i>t</i> and of the sub-endocardial viability ratio (SEVR). (a) Graphically, d<i>P</i>/d<i>t</i> 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 sub-endocardial 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