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 ?
A high backpressure increases the resistance the exhaust gas flow has to overcome before it reaches the exhaust system.
Similar to the suggestion for backpressure, try keeping the screw speed at the minimum level required to fill the screw consistently.
Gases are trouble because if they are not removed from the mold completely, they can adversely affect quality by creating backpressure in the mold.
The high efficiencies and low backpressures of Ascentis Express enable the researcher to either double the speed or resolving power above current HPLC methods," said Wayne K.
Ability to plot first-stage injection, second-stage pack/hold, and backpressure on one graph.
1 mL/min at 1000-2000 psi backpressure (individual pumps) Maximum Operating Pressure: about 6,000 psi
You set screw rpm and backpressure, and plasticating time is a result.
The company's exclusive Saddle Support Technology doubles the backpressure ratings of its line of Tideflex in-line check valves, according to company literature.
Reduction of inlet backpressure by as much as 60 percent, resulting in increased output.
The WESP transfers the particles into a water stream without generating significant backpressure, and can be used in conjunction with most abatement devices.
7 om superficially porous particles for high resolution and low backpressure (stable to 600 bar), and 1.
Adjusting the spring pressure reduces interference with the injection process--that is, needle shutoff backpressure can be set from 220 to 350 bar (3190 to 5080 psi).