back pressure


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back pres·sure

pressure exerted upstream in the circulation as a result of obstruction to forward flow, as when congestion in the pulmonary circulation results from stenosis of the mitral valve or failure of the left ventricle.

back pressure

Etymology: AS, baec + L, premere, to press
pressure that builds in a vessel or a cavity as fluid accumulates. The pressure increases and extends backward if the normal mechanism for egress or passage of the fluid is not restored.

back pres·sure

(bak presh'ŭr)
Pressure exerted upstream in the circulation as a result of obstruction to forward flow, as when congestion in the pulmonary circulation results from stenosis of the mitral valve or failure of the left ventricle.

Patient discussion about back pressure

Q. I have a back pain that started few weeks ago. It's not related to any physical pressure what can it be? Few weeks ago I began to feel a strange pain in my back. Its not an ordinary pain. Its not related to movements, I didn't get hit anywhere, its just a constant pain and a bad feeling of uncomfort in this area. In addition my wife said to me that my skin is yellowish. I must admit that I can't notice it but she and my son claims so. what can it be? For general knowledge I am a 61 years old, i smoke and drink beer but not in a exaggerated way.

A. Back pain is one of the most popular symptoms an old man can suffer from. Most of the times it's just back pain. It could be worst things - even cancer, so you should got to your GP BUT, don't worry most of the chances is that it is just a back pain.
as far as i know you can have back pain from sleeping in a bad position, so you can't recall an injury to the back, but you hurt it every time you take a nap.

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References in periodicals archive ?
The plasticator was running at 235(degrees)C for all four barrel zones, a screw speed of 99 rpm, and with a back pressure of 2.
Zone interaction and back pressure are treated as hidden or unmeasurable disturbances in the overall control model.
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This pressure adjustment should also affect the back pressure on the membrane of the round window to improve the fine tuning of the cochlear hair cells' response.
They protect drinking water systems against back pressure, back flow and back siphonage, ensuring compliance with relevant water regulations.
Company's Type SR5 sanitary pressure regulators and Type SR8 sanitary back pressure regulators have expanded to include 2-inch and 3-inch models.