Table 5 Rest and stress algorithm set
From: WEB downloadable software for training in cardiovascular hemodynamics in the (3-D) stress echo lab
Calculated values | Method | Measure unit |
|---|---|---|
Body Surface Area (BSA, at rest) | Sq.Root {(Kg.)*(Cm.)/(3600)} | M 2 |
(rest, and peak stress) | ||
Stroke Volume (SV) | EDV - ESV | mL |
Cardiac Output (CO) | stroke volume * heart rate | L/min |
Mean Arterial Pressure (MAP) | (SBP-DBP)/3 + DBP | mmHg |
Pulse Pressure (PP) | SBP-DBP | mmHg |
End Systolic Pressure (ESP) | SBP * 0.9 | mmHg |
LV Elastance ( E es ) index | ESP/ESV * BSA -1 | mmHg/mL/m 2 |
Effective arterial elastance index ( E ai) | ESP/SV * BSA -1 | mmHg/mL/m 2 |
Ventricular-Arterial Coupling (VAC) | E es/E a = (ESP/ESV)/(ESP/SV) = SV/ESV | ratio |
Systemic Vascular Resistance (SVR) | 80 * (MAP- 5) ⁄ Cardiac output | (dyne*sec)/cm 5 |
systemic arterial Compliance (C) | Stroke Volume/Pulse Pressure | mL/mmHg |
Mitral E/e' | ratio | |
Diastolic Mean Filling Rate | (SVi/Cardiological Diastolic Time) × 1,000 | mL/m 2 × sec -1 |
Diastolic time/systolic time ratio | M-Mode or Sensor | ratio |
And, for right heart function: | ||
Pulmonary Artery Systolic Pressure (PASP) | 4×(Tricuspid regurgitant velocity)2 + Right Atrium Pressure | mmHg |
Pulmonary Artery Diastolic Pressure (PADP) | 4×(Pulmonary artery end-diastolic velocity)2 + Right Atrium Pressure | mmHg |
Mean PA Pressure(MPAP) | 1/3(SPAP) + 2/3(PADP). | mmHg |
Mean PA Pressure (MPAP) | 4×Peak pulmonary regurgitant velocity2 | mmHg |
Pulmonary Artery Pulse Pressure (PAPP) | 4×(Tricuspid regurgitant velocity)2 - 4×(Pulmonary artery end-diastolic velocity)2 | mmHg |
Pulmonary Vascular Resistance (PVR) | PVR = 80 × (MPAP - PCWP)/CO | (dyne*sec)/cm 5 |
Pulmonary Vascular Resistance (PVR) | 10 × Tricuspid regurgitant velocity/PTVI | Woods units X 80 = (dyne*sec)/cm 5 |
Pulmonary Vascular Capacitance (PVC) | Stroke Volume/Pulmonary Artery Pulse Pressure | mL/mmHg |