GE CARESCAPE, User Manual

Page: 230 / 548

Non-invasive blood pressure
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x = Cuff pulsation waveform
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y = Cuff pressure
1. Cuff deflation
2. Systolic pressure (ratio of maximum amplitude)
3. Mean arterial pressure (maximum pulsation amplitude)
4. Diastolic pressure (ratio of maximum amplitude)
5. Cuff pulsations (each pulsation represents one heart beat)
6. Amplitude (changes based on cuff pressure)
7. Resulting waveform
Systolic and diastolic determinations are based on a mathematical calculation within
the algorithm. The deflation mode is heart rate dependent, it is typically longer with
heart rates that are slow and/or irregular.
This patented process of finding two matched pulsations of relatively equal amplitude
and frequency at each step rejects artifact due to patient movement or other
deviations from ideal conditions (e.g., cuff disturbances) and greatly enhances the
overall accuracy of the monitor.
NOTE
NIBP values are based on the oscillometric method of
non-invasive blood pressure measurement taken with a cuff
on the arm of adult and child patients, and a cuff on the
calf of infants. The values correspond to comparisons with
intra-arterial values within ANSI/AAMI SP10 and IEC particular
standards for accuracy (a mean difference of ± 5 mmHg, and
a standard deviation of < 8 mmHg).
TRAM modules’ NIBP technology
TRAM modules use the DINAMAP Classic algorithm. This algorithm measures the
mean arterial pressure and then determines the systolic and diastolic values. The
algorithm examines pulses from the cuff and waits for two sequential pulses equal
in both frequency and amplitude. It will not deflate the cuff until it has good data.
Artifact and false pulses are rejected.
230 CARESCAPE Modular Monitors 2062971-001