Cardiac Output (CO) Monitoring
Cardiac output (CO) is the amount of blood that is ejected from the heart per minute. Monitoring the components of CO allows clinicians to assess if there is a sufficient volume of blood in the body to transport oxygen. Monitoring CO can help clinicians manage fluids, monitor therapeutic interventions, and improve patient outcomes.1
CO monitoring, along with other advanced hemodynamic parameters, is available through the Masimo LiDCO™ Hemodynamic Monitoring System.
Fluid administration is one of the most common interventions made to increase CO. However, fluid administration should be balanced to avoid both hypovolemia and hypervolemia, which have both been associated with negative outcomes.2
Oxygen delivery (DO2) is the amount of oxygen delivered to the tissues, calculated as the product of CO and oxygen content (CaO2).
CO is calculated by multiplying the stroke volume (SV) by the patient’s heart rate (HR). SV is the amount of blood pumped by the left ventricle of the heart in one contraction.
DO2 and CaO2 are influenced by the patient's Oxygen Saturation (SaO2) and Hemoglobin (Hb).
The PulseCO™ algorithm provides continuous beat-to-beat CO and SV by analyzing a blood pressure waveform. The algorithm is based on physics and physiological principles and focuses on pulse power analysis rather than waveform shape or contour. Unlike other arterial pressure algorithms, PulseCO is not based on statistics and assumptions about vascular compliance, nor on the detection of the dicrotic notch, which is often a challenge with peripheral arterial signals. As a result, the PulseCO algorithm avoids the limitations of other pulse pressure or contour-based hemodynamic monitoring technologies.
The current gold standard in hemodynamic monitoring, although not as commonly used due to its invasiveness, is the pulmonary artery catheter (PAC). The PulseCO algorithm has been validated against the PAC demonstrating a good agreement between the two methods.8,9
In addition, the precision of the PulseCO algorithm to trend changes in stroke volume has been evaluated in a number of clinical situations, including on: general surgical patients10 and during high cardiac output,11 hyperdynamic liver transplant,12 post-operative care,13,14 congestive heart failure,15,16 pre-eclampsia,17 and intensive care.18-20
In a study comparing the outcomes of 600 emergency laparotomy patients, researchers found that, following the implementation of a program including LiDCO Monitoring with PulseCO technology, there was a significant decrease in mortality at 30 days (from 21.8 to 15.5%) and 180 days (from 29.5 to 22.2%).21
In a randomized, controlled trial of 743 patients undergoing major abdominal surgery, researchers found hemodynamic optimization with LiDCO Monitoring with PulseCO technology led to a 20% reduction in postoperative complications and, as a result, patients monitored with LiDCO Monitoring with PulseCO technology were on average $530 less expensive to treat than control patients who were not monitored.1
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