Systems And Methods For Measuring Cardiac Output

A system for hemodynamic monitoring of a patient to provide a combined cardiac output measurement from two hemodynamic sensors, the system comprising:

• a peripheral arterial pressure sensor for sensing a peripheral arterial pressure signal;
• a central artery catheter sensor for sensing a central blood flow signal;
• and
• a computational processing system in operable connection with the peripheral arterial pressure sensor and the pulmonary artery catheter, the computational processing system comprising:
• a processor system;
• and
• a memory system comprising one or more applications that can direct the processor system to:
• derive, using an arterial pressure-based cardiac output (APCO) algorithm, an APCO based upon the peripheral arterial pressure signal;
• derive, using a thermodilution based cardiac output algorithm, a thermodilution based cardiac output based upon the central blood flow signal;
• derive a time-varying linear scaling equation, wherein derivation of the time-varying linear scaling equation comprises:
• determining a scaling factor and an offset factor, wherein determining the scaling factor comprises determining whether the scaling factor is a preset value or a computed value using a temporally weighted APCO and a temporally weighted thermodilution based cardiac output, and wherein determining the offset factor comprises using the scaling factor, the temporally weighted APCO, and the temporally weighted thermodilution based cardiac output;
• and
• compute, using the derived time-varying linear scaling equation, a combined cardiac output, wherein computing the combined cardiac output comprises applying a scaling factor and an offset factor to the APCO.