2 solutions for noninvasive blood pressure measurement
Post on 31-May-2015
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2 solutionsfor noninvasive blood pressuremeasurement
emkaPACK & nibpSNAPSHOT
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noninvasive blood pressuremeasurement
A
B
C
D
overview
emkaPACK
nibpSNAPSHOT
software analysis
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overview
A
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what is NIBP?a noninvasive method for measuring the blood pressure of laboratory animals (dog, primates, etc.)
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how does it work?
emka TECHNOLOGIES’ noninvasive blood pressure systems are based on the oscillometric technique: pressure is measured from a cuff around a limb or the tail that is inflated to block blood flow then deflated slowly
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what is analyzed?
time
cuff pressure
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2 different solutionsemkaPACKnibp is an optional feature of our emkaPACK noninvasive telemetry system - suitable for long term measurements on unrestrained animals
nibpSNAPSHOTself-contained, handheld device designed for single-point measurements
both supplied with dedicated software for data acquisition & analysis
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common features
low and high pressure range 0-300mmHgadjustable deflation speed5mmHg/s – 15mmHg/slinear deflation speedhigh speed servo-control by instant pressure and dPdtadjustable pulse amplification 5x-100x
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emkaPACK
B
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designed for the emkaPACK systemsingle-shot or programmable cyclic operationembedded calibration information
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setting-up the animal
tail is shaved
cuff is wrapped around the tail and connected to the transmitter
a custom velcro extension protects the cuff, and maintains it in the proper position on the tail
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nibpSNAPSHOT
C
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nibpSNAPSHOT
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features
handheld deviceUSB connection to computerpowered through USBboth a NIBP device and a 7-leads ecg devicedesigned for single-point measurementsmeasurements can be repeated every 10s if necessary
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specifications
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software analysis
D
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real-time & off-line software analysis
real-time analysis performed by iox2 (nibpSNAPSHOT, emkaPACK, emkaPACK 4G)
off-line analysis performed by ecgAUTO (nibpSNAPSHOT, emkaPACK, TOE)
control by iox2
ecgAUTO
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parameters computed from the deflation curve alone
systolic blood pressurediastolic blood pressuremean blood pressure
ecgAUTO
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parameters computed with simultaneous ecg
heart ratepressure transit time
ecgAUTO
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pulse amplitude vs cuff pressure
pressure pulses and ecg
cuff pressure vs time
real-time analysis in iox2
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pulse amplitude vs cuff pressure
pressure pulses and ecg
cuff pressure vs time
off-line analysis in ecgAUTO
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how is analysis performed?
detects inflation cyclesapplies hi-pass filterselects valid blood pressure pulsesproduces bell shaped amplitude curvecomputes mean, systolic and diastolic pressure values
ecgAUTO
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what are the challenges for a successful analysis?
when signal is noisy the algorithm picks pulses that correspond to blood pressure beats and ignores artefacts
for greater efficiency, the software applies a number of criteria and rejects unreliable or spurious results
present experience (around 1000 hours of data from 40 dogs) indicate that from 70 to 95% of inflation cycles produce reliable data
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examples of good and poor quality signals
pulses from noisy zones are ignored
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