The hemodynamic Cardiac Profiler uses a dedicated thorax electrode configuration of 16 electrodes (quite similar to ECG electrodes) is connected to a small wearable patient unit with wireleess telemetry to a medical PC and display.
Figure 1: General arangement of the Hemodynamic Cardiac Profiler
A Harmless weak electrical current is the injected into the patients skin by two electrodes t the neck base and two at the lower abdomen. The movement of the heart structures and the blood emptying/filling fraction by the heart chambers and large assiciated vessels, as wel as breating action and upper body muscle use, causes local changes to voltage potentials measured by the strategically placed the electrode array on the patients chest.
Figure 2: Apllication of a weak harmless current injection.
After measuring and storing the voltage potential shift daa on eight separate channels, and using a unique patented algorith called "Field Reconigition", the HCP patient unit is avle to filter the data by an algoirthm into an artial and ventricular 'fingerprint'. These signals are then plotted as a stoke volume curve that represents and quantifies the left atrial and left ventricular filling furing the cycle of a heartbeat, and refreshes the data every 20 seconds.
Figure 3: The atral and ventricular fingerprint in the voltage shift pattern during a hemodynamic cycle.
Figure 4: Example of a ventricular filling curve with associated ECG timing and filling phases.
The patient Unit transmit the data wirelessly to a remote viewing station. The profile of the presented curve holds valuable data about the emptying and filling action and volume of the heart and prossible abnormalities that may be asymptomatic.
Such data is otherwise only available to a clinician if ordered through more complicated and extensive diagnostic tests such as Echocardiography (Echo Doppler), or magnetic resonance imaging (MRI) to be scheduled, usually during a second, third and fourth visit which take time to organize and place burden on both the patient and hospital resources, and are more costly.
Figure 5: Typical cardiac abnormalities that can be derived from the curve profile
Curve Profiles differ for the young patient versus the old, healthy versus the ill, and also the influence of excersise can be seen. The results of the Hemodynamic Cardiac Profiler are easy to interpret by a trained physician. Thereby, for the first time hemodynamic can be assessed very early on in the dagnostic process.
It is a tool that provides objective hemodynamic insight without operator bias, and allows comparison of hemodynamic performance of a longer period of time