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Is BP 140/72 OK? I am underweight

i went to walmart and used one of those machines to see what my BP reading is i got a 140/72.... i know the 140 is not good but the 72 is good... i was just hoping someone would explain this reading to me.. like what would cause my BP at rest to be so calm as a 72 to hypertention level 1 pressure ... does that mean i have high cholesterol? extra info: i am 21 and skinny underweight .. 6 1 150lb when i was 19 i had what i think i was a mini stoke theres a name for it i forget (never been to the doc since then tho so who knows). my entire body went numb and it was a bit hard to move it HURT a lot and i had my friend drive me to the hosiptal cause i thought i was going to have a heart attack or was having one... but i didnt go in cause im poor and we just wait outside to see if it would stop it did about 40 mins to and hour or so.. ever since then i have had pains in my neck front were the arterys are it hurts only a little like there is too much pressure.. also it has been harder to breath like im not getting any oxygen for a bit it was so bad i would be forced to stop what i was doing and lay down or do something so i would not passout... i assumed it was my BP but i have read over and over that you CANT tell you have high BP you have to be tested.... but I KNOW so is there another cause or what? sorry it was long.
Asked On : Sat, 19 Dec 2009
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  User's Response
Wishbone's posting perpetuates the medical fraternity's touching (but totally misguided) belief in the myth that blood is pumped round the systemic vasculature in 'waves' of blood, -which of course is demonstrably not the case If it were, then the pulse would be audible simply by placing the stethoscope on the brachial artery, and picking up the sounds of these "waves of blood". But irritatingly, (and most inconveniently for medics and other exponents of the "pulsatile arterial flow" theory), ..... the beat is essentially inaudible until cuff pressure induces constriction and disappears as flow becomes laminar again. A stethoscope only registers turbulent flow and pulses where the turbulence converts pressure to force and force to sound, -typically at locations such as at ,or near to, the heart and relatively close to the aortic valve. So, -Wishbone is failing to distinguish between pulses in pressure, and pulses in FLOW. He's in very august company, of course; - all textbooks make the same mistake, and conflate the two. While volumes of ventricular blood are indeed ejected at each stroke into the aorta, generating waves of pulse-pressure that flow down the arterial tree in the process, that's all they are...... They're only pressure waves, not waves of flowing blood. The pressure waves travel at a much higher velocity THROUGH the blood than does the blood itself, (and tissue) and therefore do not ( -indeed CAN not)- 'drive blood' -any more than a ghost passing through a door can open it. Why? - Well because the pulse pressure waves are not in phase with the flow. Even at the aortic valve, at the instant the valve opens, hydrostatic pressure within the ventricle is maximum when flow is at first zero, and then as flow rises to its maximum, the intra-ventricular pressure is falling towards minimum. They're out of phase, and pressures out of phase with flows aren't performing any work. (It's exactly the same as volts and amps. If they're not in phase no watts result and no power is expended.) But once the valve has closed and the pressure waves travel down the aorta and downstream arteries, they don't even have a (net) vectorial component that's in phase with the direction of flow. The waves pass through the blood; they don't drive it. So what the pressure monitor registers is merely the instantaneous peak-to-peak values of a transient, traveling, longitudinal wave ...... - of pressure, not flow. A flow-meter, however, would register smooth laminar flow, and an intra-arterial pressure transducer registers only fleeting, transient pressure pulses. The audible pressure pulse heard during ausculatation has nothing whatever to do with what drives the blood round. What drives blood round is simply the diastolic pressure gradient. -Sorry.!
Answered: Sat, 19 Dec 2009
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