TNO Finger Pressure Reference Guide - Integral Process

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TNO Finger Pressure Reference Guide 4WarningThe data produced by Portapres and Finometer or the accompanyingsoftware is intended as an adjunct in patient assessment and should not beused as the sole means for determining a patient’s diagnosis.
TNO Finger Pressure Reference Guide 5Table of Contents1 Introduction .........................................................................71.1 This reference guide ................................................................................71.2 Related Publications ................................................................................71.3 Finapres ...................................................................................................81.4 Portapres..................................................................................................81.5 Finometer.................................................................................................81.6 Contacting TNO-Biomedical Instrumentation.........................................92 Measurement principle .....................................................102.1 Introduction ...........................................................................................102.2 Finger cuff .............................................................................................102.3 Plethysmograph .....................................................................................112.4 The pressure-diameter relationship........................................................122.5 Volume-clamp method ..........................................................................132.6 Physiocal algorithm ...............................................................................152.7 Example of a normal Physiocal .............................................................162.8 Example of a multi-step Physiocal ........................................................172.9 Example of a Physiocal with variable pressure levels ...........................182.10 Pressure staircase at the start of a measurement ....................................182.11 Physiocal frequency...............................................................................192.12 Note on blue fingertips ..........................................................................203 Measurement accuracy.....................................................223.1 Comparison with intra-arterial blood pressure.......................................223.1.1 Finger arterial pressure ..................................................................223.2 Brachial arterial pressure.......................................................................233.2.1 Pulse wave distortion.....................................................................243.2.2 Pressure gradient ...........................................................................263.3 Bias and precision .................................................................................263.4 Clinical use ............................................................................................263.5 Waveform filtering and level correction methods .................................273.5.1 Wave distortion correction ............................................................273.5.2 Pressure gradient correction ..........................................................283.5.3 Combination of waveform filtering and level correction...............283.6 BeatScope software program.................................................................294 Practical guidelines...........................................................314.1 Selecting the proper hand ......................................................................314.2 Selecting the proper cuff........................................................................314.3 Wrapping the cuff correctly...................................................................324.4 Selecting a finger switching interval......................................................34
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TNO Finger Pressure Reference Guide - Integral Process

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