phyrev ch.11 - Graphical Recording: Paper record, Doppler...

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Graphical Recording: Paper record, Doppler or plethysmography ….X- time, Y axis – velocity, frequency or pressure if u hear noise from the pen, f within audible range AC & DC coupling - AC – alternating current – changes rapidly in time, measures rapid changes in a signal, arterial - DC – direct current – changes gradually over time, measures slower changes in a signal Most plethysmographic systems provide an option of AC DC modes, is selected by technologist. Plethysmography – to measure an increase, measures changes in limb volume, arterial inflow or venous outflow, systolic blood pressure, pulse waveform contours Vessel Occlusion – artery – cuff inflated to BP + 20 mmHg will occlude all artery and viens Displacement Plethysmography – uses air filled cuff, pneumo- plethysmography Venous – normal – rapid upstroke, substantial filling with little pressure increase, empty rapidly - abnormal – slow upstroke, little increase in limb volume Phleborheography – (PRG) –
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phyrev ch.11 - Graphical Recording: Paper record, Doppler...

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