Masimo LiDCO Chapter 4: Operation
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Parameters Display
Each parameter display consists of a trend line and a numeric value.
The user can swipe on any trend line to see historical information on all trend lines.
The user can pinch in and out on any trend line to expand and contract the time frame shown on
all trend lines.
For all parameters, the module sends data to the monitor every second.
Systolic, Mean Arterial and Diastolic Pressures (Sys, MAP, Dia)
Systolic (Sys) and Diastolic (Dia) blood pressure represent the peak and trough of the pressure created
by the heartbeat. Mean Arterial Pressure (MAP) is the average blood pressure across the heartbeat.
Systolic and Diastolic blood pressure is calculated on a beat-to-beat basis. Mean Arterial Pressure
represents an estimate of the tissue perfusion pressure. It is calculated on a beat-to-beat basis.
Cardiac Output (CO)
Cardiac Output (CO) is the amount of blood the heart pumps through the circulatory system in a minute,
calculated by multiplying the stroke volume by the patient’s heart rate in liters/minute. Cardiac Output is
calculated on a beat-to-beat basis via the arterial pressure waveform using the LiDCO algorithm. It can
be expressed is an index value Cardiac Index (Ci) by dividing CO by the body surface area (BSA).
Heart Rate (HR)
Heart Rate (HR) is the frequency of heart beats measured in beats per minute from the arterial pressure
waveform. It is calculated on a beat-to-beat basis
Heart Rate Variation (HRV)
Heart Rate Variation (HRV) is a measure of the dynamic changes in HR during a respiratory cycle. Heart
Rate Variation is calculated over a 10 second period which contains one or more respiratory cycles. HRV
is standard deviation of HR divided by the average HR and is displayed as a percentage (0-100%).
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