IQ2™’s patented signal processing
Technology plots power, time
and frequency of impedance changes to create a three-dimensional view of cardiac function. It’s 3-dimensional analysis reveals crucial information about dyssynchronous beats as opposed to hemodynamic estimates displayed by two-dimensional signal processing technologies.
IQ2™ works by measuring electrical impedance changes throughout the thorax as aortic blood flow increases and decreases in response each heartbeat. Impedance changes originate in the thoracic aorta when blood is ejected from the left ventricle during systole. The IQ2™ identifies the beginning of the electromechanical systole, the opening of the aortic valve (B), the maximum ventricular contraction (C) and the closing of the aortic valve (X) .
The Patient is connected with
tow pair of impedance electrodes. The outer injecting electrodes introduce a high frequency, low magnitude, alternating current across the thorax. The inner sensing electrodes measure changes in the resistance to that current.
Correct placement of the electrodes is essential. The sensing electrodes define the thorax. The upper limits of the thorax can be described as the root of the neck. The lower limit is at the level of the xyphoid sternal junction. Three ECG electrodes are placed in a standard Lead II configuration on the chest. These may require repositioning in order to optimize signal amplitude.