Have you ever wondered why our monitors are so accurate and how we differ from current competitors on the market?
🛑 Older Hemodynamic Monitors:
▪ Single beat analysis
▪ CO= PP x HR
🚫 PP increases due to SV increase, but also due to vasopressors. These algorithms cannot tell them apart.
💪 Argos Hemodynamic Monitor
▪ Multi-Beat Analysis
▪ CO= (MAP-CV)/SVR
✅ Accuracy is not impacted by arrythmia, changes in vasomotor tone, or low CO
*Other hemodynamic monitors analyze one beat at a time and assume that cardiac output is proportional to pulse pressure X heart rate. This assumption has a fundamental flaw. As you know, pulse pressure will increase when you give fluids to a fluid responder, just like stroke volume. Pulse pressure will also increase if you give a vasopressor due to pulse pressure amplification. So, any monitor that assumes that Cardiac output is proportional to PP x HR can’t tell the difference between increases in stroke volume and increases in SVR. This is why the literature shows that other pulse contour technologies fail during changes in vasomotor tone.
What we do is analyze 20 seconds of heart beats and create a model of the circulation, including the vascular resistance and other parameters. Then we vary the parameters until the model waveform matches the observed waveform. Once the waveforms match, then we know the resistance and we get cardiac output by taking (MAP - CVP) and dividing it by SVR. Since we model the resistance directly, our algorithm is not adversely impacted by vasomotor tone changes. Plus, because we use multiple heat beats to determine the cardiac output, our algorithm also works during arrhythmia, whereas the others do not.