The LiDCO uses the PulseCO™ algorithm to derive stroke volume (SV) and heart rate from the blood pressure waveform. The key step in the algorithm is the conversion of the blood pressure to volume to account for both aortic compliance and capacitance. The PulseCO™ algorithm uses a patient-specific factor to adjust the aortic capacitance individually for each patient. The factor can be precisely determined by comparing a known cardiac output with the PulseCO™ estimate. This factor does not change for a patient over the short term.
Because the factor does not change, it was possible to develop a nomogram, or mathematical relationship, using the patient’s characteristics to estimate it. The nomogram used in the LiDCO was developed from carefully controlled studies of the PulseCO™ algorithm with precise determinations of cardiac output using lithium indicator dilution. The result is a robust method for estimation of the factor.
The LiDCO shows the long-term trend of pressure (MAP,
Dynamic Preload Parameters Window
This LiDCO window also provides you with access to preload response values or volume status indicators of Stroke Volume Variation (SVV%). For closed chest ventilated patients these volume status measurements provide a way of predicting the likely response to volume infusions. A fluid imbalance can have an adverse effect on a patient’s cardiac performance and, in turn, oxygen delivery to key organs.
Blood Pressure Window
At the touch of a button, the arterial pressure waveform is displayed on the LiDCO screen. The LiDCO algorithm and individualized scaling function convert this pressure into nominal stroke volume and nominal cardiac output.
Event Response Window
Pre-Load Responsiveness via the Event Response Display. The Event Response display allows the user to view a selected hemodynamic variable in a higher resolution during a specific period (e.g. fluid challenge, inotrope change). The LiDCO will display percentage change from the start for the variable as a numeric value. This feature is very useful when evaluating the patient’s response to targeted interventions such as a fluid challenge or changes in inotrope therapy.
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