Re: sphygmomanometer New Topic : using a Mercury Sphig to Diagnose ADD

[Guest guest]

You would think then, someone could use your formula and make a bp monitor using a solution that has the same density but does not contain mercury. I'd buy it

For those space cadets among us, the mercury sphyg can't be used as itrequires normal earth gravity. " The millimeter of mercury (symbol: mmHg) is defined as the pressureexerted at the base of a column of fluid exactly 1 mm high, when the

density of the fluid is exactly 13.5951 g/cm³, at a place where theacceleration of gravity is exactly 9.80665 m/s² "

>>>>>>>>>> The Mercury Sphigs should not ever need calibration, since they are actually> measuring millimeters of mercury. They are the " gold (er, mercury) "

> standard.-- Graham Chiuhttp://www.synapsedirect.comSynapse-EMR - innovative electronic medical records system

-- M.D.www.elainemd.com

[Guest guest]

Elaine,

I think you'd need a very high stud ( ceiling ) if you used a less

dense material.

I remember when I was a house surgeon ( first year out of med school

), and there was a grand round I was attending. Another house surgeon

was doing a presentation on a case, and said that the CSF pressure was

20 mmHg. At question time, I questioned this pressure, and one of the

consultants quipped " Must be the first opening snap ever from a

lumbar puncture! "

>

>

>

>

>

>

> You would think then, someone could use your formula and make a bp monitor

> using a solution that has the same density but does not contain mercury. I'd

> buy it

>

>

>

>

>

> >

> >

> >

> >

> >

> >

> > For those space cadets among us, the mercury sphyg can't be used as it

> > requires normal earth gravity.

> >

> > " The millimeter of mercury (symbol: mmHg) is defined as the pressure

> > exerted at the base of a column of fluid exactly 1 mm high, when the

> > density of the fluid is exactly 13.5951 g/cm³, at a place where the

> > acceleration of gravity is exactly 9.80665 m/s² "

> >

> > On Sat, Feb 16, 2008 at 6:31 AM, T. , MD

> > wrote:

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> > >

> > > The Mercury Sphigs should not ever need calibration, since they are

> actually

> > > measuring millimeters of mercury. They are the " gold (er, mercury) "

> > > standard.

> >

> > --

> > Graham Chiu

> > http://www.synapsedirect.com

> > Synapse-EMR - innovative electronic medical records system

> >

>

>

>

> --

> M.D.

> www.elainemd.com

--

Graham Chiu

http://www.synapsedirect.com

Synapse-EMR - innovative electronic medical records system