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 ?
This section pumps the plastic forward and generates the backpressure.
AMTAC reduces backpressure through several design elements.
In the first set of tests, the exhaust backpressure was kept constant while the in-cylinder pressure at EVO was gradually increased by increasing the engine load.
The Icelandic Power Company, Landsvirkjun, seeks tenders for backpressure Turbine and Generator for the Bjarnarflag geothermal Power Plant in the north-east part of Iceland, in accordance with Tender Documents No 20210.
As such heterogeneous devices usually have different capabilities in terms of cache, battery, and computation, many classical backpressure based algorithms designed for homogeneous networks cannot perform efficiently in such networks.
A high backpressure increases the resistance the exhaust gas flow has to overcome before it reaches the exhaust system.
Suspended enzyme is then injected onto the HPLC/UHPLC column, where it can precipitate on the head of the column, resulting in a rapid decrease in column lifetime and an increase in backpressure.
This in turns puts great backpressure on the pumps.
It provides diesel particulate filter regeneration under any conditions with reduced fuel penalty and improved backpressure engine performance, especially with cold-duty cycles in city traffic.
Clean system provides diesel particulate filter regeneration under any conditions with reduced fuel penalty and improved backpressure engine performance, especially with cold-duty cycles in city traffic.
The line went off owing to breakdown triggered by backpressure.
7) However, smaller particle increases size the backpressure and so present a technical constraint on the system.