Table 2.
Quantitative stress-echo assessment and calculated hemodynamic parameters
| Measured values (rest, peak stress, recovery min. 1, 3, 5) | Method | Measure unit |
| Heart rate | ECG | bpm |
| LV ESV index | 2D echo (Simpson rule)/BSA | mL/m2 |
| LV EDV index | 2D echo (Simpson rule)/BSA | mL/m2 |
| SBP | Sphygmomanometer | mmHg |
| DBP | Sphygmomanometer | mmHg |
|
Calculated values (rest, peak stress, recovery min. 1, 3, 5) |
||
| Stroke volume index | EDV index – ESV index | mL/m2 |
| Cardiac index | stroke volume index * heart rate | L/min/m2 |
| Mean Arterial Pressure | (SBP-DBP)/3 + DBP | mmHg |
| LV elastance index | SP/ESV index | mmHg/mL/m2 |
| Effective arterial elastance index (EaI) | (SBP*0.9)/Stroke volume index | mmHg/mL/m2 |
| Ventricular-arterial coupling | LV elastance index/Eai | ratio |
| SVR index | 80 * (MAP-5)/Cardiac index | dyne * sec * cm5 |
SBP = Systolic Blood Pressure; DBP = Diastolic Blood Pressure; SVR = Systemic Vascular Resistance, where 5 is an approximation of the right atrial pressure, and MAP is mean arterial pressure; Ventricular-arterial coupling is ventricular elastance/arterial elastance, which can be described as end-systolic pressure/end-systolic LV volume divided by end-systolic pressure/stroke volume. The pressure terms in the numerator and the denominator cancel out, and ventricular-arterial coupling equals stroke volume/end-systolic volume.