[sdiy] Amplifying Pulse (Slightly OT)

rburnett at richieburnett.co.uk rburnett at richieburnett.co.uk
Fri Aug 10 13:02:05 CEST 2018

On 2018-08-10 10:23, Gordonjcp wrote:

> Your pulse doesn't make any sound.  You can feel a slight flexing of 
> the
> radial artery when you take your pulse at your wrist, but it's way too
> small and slow to make any noticeable sound.
> When you measure blood pressure with an old-fashioned sphygmomanometer
> you're listening for blood scooshing through the brachial artery as the
> air bladder in the cuff squeezes it shut.  You pump it up until the
> noise stops (artery closed) then release the pressure until you just
> start to hear it hiss through which gives you the systolic pressure, 
> and
> slowly release it some more until you just hear it as a faint tapping
> for the diastolic pressure.

A colleague across the office from me who's working on a project in this 
area said exactly the same as what Gordon said. Practically word for 

> Automatic sphygs use the change in pressure in the bladder to measure
> it, apparently.  I've never had one apart.

The "Oscillometric method" apparently, for anyone interested...



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