VAC Calculator

Ventricular-Arterial Coupling — Chen Single-Beat Method

Patient

Identifier / Name

Default @NAME@ pastes into Epic

Select Measurement Method

Hemodynamics

SBP mmHg

Enter a value between 40–260 mmHg

DBP mmHg

Enter a value between 20–160 mmHg

Carotid Doppler

VTI cm

Left CCA, 2cm proximal to bifurcation

Enter a value between 1–60 cm

CCA Diameter cm

Short axis B-mode, same location

Enter a value between 0.2–1.5 cm

How to measure ET and PET — Carotid PWD

CCA ET ms

Foot of upstroke → dicrotic notch

Enter a value between 100–600 ms

PET ms

Q wave onset → foot of upstroke

Enter a value between 30–250 ms

Echo Parameters

VTI cm

LVOT PWD

Enter a value between 1–60 cm

LVOT Diameter cm

B-mode long axis, at AV leaflet insertion

Enter a value between 0.5–4.0 cm

LVEF %

Teichholz or Simpson's biplane

Enter a value between 5–85%

How to measure ET and PET — LVOT PWD (apical view)

LV ET ms

AV opens → AV closes on LVOT PWD

Enter a value between 100–600 ms

PET ms

Q wave onset → AV opens on LVOT PWD

Enter a value between 30–250 ms

Results

VAC (Ea / Ees)

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mmHg/mL

Ees

—

mmHg/mL

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This calculator is intended as a clinical research and educational tool. It should not be used in isolation or acted upon without oversight by an experienced physician.