CUTTING-EDGE DIAGNOSTICS. Forty years in development, thoracic impedance technology, also known as impedance cardiography (ICG), has come of age. Development was started for NASA in 1965 to monitor the health of astronauts. Thoracic impedance was first officially used in 1983 aboard Space Shuttle flight STS-8. This technology has been repeatedly refined since its early applications. It took väsamed to bring this technology to the medical mainstream here on earth.
MORE THAN JUST NUMBERS. Today, the AcQtrac System fulfills the promise of giving physicians pertinent cardiac and hemodynamic information in a signature waveform. You get an efficient, at-a-glance visual combined with the numerical data. The report allows the physician to see a bigger picture of hemodynamic health than ever before.
The AcQtrac System uses impedance cardiography technology that is based upon the principle that the human thorax is electrically a nonhomogeneous bulk conductor. The AcQtrac System uses four
pre-gelled electrodes to separate the current pathway from the
sensing pathway.
The current from the two outer electrodes send a current across the thorax, which is sensed by the two middle electrodes. The electrodes not only calculate cardiac hemodynamic parameters, they also detect the EKG signal. The aorta and vena cava act as a natural conduit of least resistance to flow for the generated current. The AcQtrac System converts the measurement into a variety of parameters related to different cardiovascular physiologic functions along with an
at-a-glance waveform.
The AcQtrac System reduces complex technology to its simplest form. By looking
at the big picture
(12 parameters) the
AcQtrac System distills reams of information down to one easy-to-view graphical report. |
Parameter /Abbreviation |
Units |
| Cardiac output / CO |
lpm |
| Cardiac index / CI |
lpm/m2 |
| Stroke volume / SV |
ml |
| Stroke volume index / SVI |
ml/m2 |
| Heart Rate / HR |
beats/min |
| Mean Arterial Pressure / MAP |
mmHg |
| Pre-Ejection Period / PEP |
msec |
| Left Ventricular Ejection Time / LVET |
msec |
| Systolic Time Ratio / STR |
n/a |
| Heather Index / HI |
ohms/sec2 |
| Systemic Vascular Resistance / SVR |
dyne·sec/cm5 |
| Thoracic Fluid Content / TFC |
kohms-1 |
Only AcQtrac’s impedance cardiography waveform shows valuable information about the patient’s condition at a glance. The waveform, along with the hemodynamic parameters, can aid in monitoring the effects of drugs, such as vasoconstrictors and diuretics, over time. It also provides a quick guide to hemodynamic health in a broad range of cardiovascular diseases such as hypertension, congestive heart failure and dyspnea.
The AcQtrac ECG determines heart rate and signals the start of a mechanical event. The waveform shows the aortic valve opening, maximum aortic flow, aortic valve closing, and the mitral valve opening. The WAV (Waveform Accuracy Value) provides added assurance that the data gathered is reliable, and iit also suggests when you may need to resample the measurements.
Click t o download a PDF version
of the AcQtrac System Brochure
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