Width of BP cuff compared to diameter of the arm
Width should be 20% larger than the diameter of the arm.
Modern BP cuffs are considered what & how do they work
-As BP decreases the needle oscillates (integrated electronics)
Drawbacks of automated oscillometers to measure BP (x2)
-2 min minimum interval
-Fails at BP < 50 mmHg
Identify the BP measuring device & explain how it works
-Uses LED plethysmography at fingertip & inflatable cuff to measure continuous BP at fingertip
Resonance in art lines & how to prevent
Always occurs due to the inertia of the fluid column but as long as it is >40 Hz it does not interfere with the quality of the reading.
-Kept above 40 Hz by using stiff, short tubing.
Dampening in art lines & impact
Occurs with an air bubble or clot (they absorb the higher frequencies)
-usually negligible to MAP reading