ICG Parameters
The electrical and impedance signals are processed to determine fiducial points, which are then utilized to measure and calculate hemodynamic parameters, such as cardiac output, stroke volume, systemic vascular resistance, thoracic fluid content, acceleration index, and systolic time ratio.
| Parameter | Definition |
|---|---|
| Heart Rate | Number of heart beats each minute |
| Cardiac Output | Amount of blood pumped by the left ventricle each minute |
| Cardiac Index | Cardiac output normalized for body surface area |
| Stroke Volume | Amount of blood pumped by the left ventricle each heartbeat |
| Stroke Index | Stroke volume normalized for body surface area |
| Systemic Vascular Resistance | The resistance to the flow of blood in the vasculature (often referred to as “Afterload”) |
| Systemic Vascular Resistance Index | Systemic vascular resistance normalized for body surface area |
| Acceleration Index | Peak acceleration of blood flow in the aorta |
| Velocity Index | Peak velocity of blood flow in the aorta |
| Thoracic Fluid Content | The electrical conductivity of the chest cavity, which is primarily determined by the intravascular, intraalveolar, and interstitial fluids in the thorax |
| Left Cardiac Work | An indicator of the amount of work the left ventricle must perform to pump blood each minute |
| Left Cardiac Work Index | Left cardiac work normalized for body surface area |
| Systolic Time Ratio | The ratio of the electrical and mechanical systole |
| Pre Ejection Period | The time interval from the beginning of electrical stimulation of the ventricles to the opening of the aortic valve (electrical systole) |
| Left Ventricular Ejection Time | The time interval from the opening to the closing of the aortic valve (mechanical systole) |
Read more about this topic: Impedance Cardiography
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