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Heart pressure

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Heart pressure

Postby allingham » Thu Mar 15, 2007 11:04 am

When blood pressure is recorded , how do you work out the systolic pressure, dystolic pressure , pulse pressure and mean artery pressure.

For example how do you work out the above if a persons blood pressure is 92/75 mm.

Cheers
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Postby mith » Thu Mar 15, 2007 8:26 pm

I think it's measured, not worked out.
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Postby canalon » Thu Mar 15, 2007 8:53 pm

You also want to know what are the 2 numbers you have. Because that might answer a good part of your question...

her e for example: http://en.wikipedia.org/wiki/Blood-pressure
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Postby Abu Anzar » Thu Mar 15, 2007 9:11 pm

if u mean how 92/75 how it come than the answer is

92 the force exert by blood on the wall of vessel that occupies 1 milli meter

i.e. 92 N per milli meter of blood vessel during systolic period :
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Postby canalon » Thu Mar 15, 2007 9:34 pm

Abu Anzar wrote:if u mean how 92/75 how it come than the answer is

92 the force exert by blood on the wall of vessel that occupies 1 milli meter

i.e. 92 N per milli meter of blood vessel during systolic period :


Nope. The pressure is given in units of pressure and are not a force. The blood pressure is measured im mm of mercury (Hg). i.e. 92 mmHg means a pressure necessary to move a column of mercury by 92mm in a satandard barometer. Pressure are now expressed in Pa and 760mm Hg=1015 HPa.

Nevertheless there is a good hint in the last sentence for at least part of your question...
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Postby mith » Thu Mar 15, 2007 11:03 pm

P = F/A. So if Abu meant N/square milimeter he would have the units right but the conversion back to mercury height doesn't work out.
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Postby Dr.Stein » Fri Mar 16, 2007 2:32 am

Image

Ask this equipment :P
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Postby Abu Anzar » Fri Mar 16, 2007 7:34 am

presure itself is what forcer per unit area

thats why I wrote that, and [b]I agree that in writing this I make a mistage as mmHg is another form of unit for pressure :([/b] this all done in little hurry, well if any of you need its conversion that how can we convert pressure from 1 unit to another than I could help him
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Postby Abu Anzar » Fri Mar 16, 2007 7:37 am

canalon wrote:Nevertheless there is a good hint in the last sentence for at least part of your question...



Thanks

I agree that I make mistake in the conversion of units, which occur in hurry
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Re: Heart pressure

Postby Revenged » Fri Mar 16, 2007 6:24 pm

allingham wrote:When blood pressure is recorded , how do you work out the systolic pressure, dystolic pressure , pulse pressure and mean artery pressure.

For example how do you work out the above if a persons blood pressure is 92/75 mm.

Cheers


In your example:

Systolic pressure - 92 mmHg

Diastolic pressure - 75 mmHg

Mean arterial blood pressure = Diasolic Pressure + 1/3 x (Difference between systolic and diastolic blood pressure)

Note that working out the mean blood pressure is NOT the average... The heart spends much longer in diastole than in systole...

NB. I have never heard of pulse pressure before... I would guess it is the same as systolic pressure if blood pressure is measured at the same level as the heart...
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