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.

More discussions about back pressure
References in periodicals archive ?
You reduce the back pressure, which means that you also reduce the escape velocity of the exhaust.
As soon as the main wheels touch, the natural reflex is to relax the back pressure and the nose gear hits the runway hard.
If Scenario 1 occurs and blood is not ejected from the ventricle this will result in back pressure through the atria and will affect the capillaries involved in gas exchange in the lungs.
Monolithic columns give chromatographers freedom to work with flow rates and solvent choices without worrying about high back pressure.
The type of control valves can vary based on the flow and back pressure required.
Some adjustments were made to increase the back pressure and decrease the barrel temperatures, resulting in a constant barrel or "flat" temperature profile.
They protect drinking water systems against back pressure, back flow and back siphonage, ensuring compliance with relevant water regulations.
The dual exhaust system has been revised with equal-length manifolds and 25% lower exhaust back pressure.
Headington said the system also takes into account the effect of changing pouring rates by self-tuning back pressure when the g/sec, setpoint is changed.
In an IMM, the disturbances include sudden changes in shear energy during injection, screw speed, and back pressure.
Why it happens: Because of their simple hydraulic layouts, free-standing waterfeatures don't have the built-in back pressure that pool systems do.
The filter itself is designed to operate within allowable engine back pressure requirements.