back pressure

(redirected from backpressure)
Also found in: Dictionary, Encyclopedia.

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 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 ?
In order to establish an optimal flow field for the fuel cell working in different pressure conditions, the backpressure of the test system was modified at two different values (70 kPa and 30 kPa).
The following section (section 5) describes application of the model to investigate the relative magnitude of the different contributions to backpressure, viz.
"Backpressure conditions exist when a pressure higher than the supply is created in the downstream piping, allowing downstream substances to be pushed into the potable water supply.
AMTAC reduces backpressure through several design elements.
Backpressure, soot loading and regeneration performance were evaluated using a Cambustion Diesel Particulate Generator (DPG) with no DOC configuration.
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.
Precise rate control through EMC (electronic mass flow control) technology continually measures hydraulic backpressure and automatically corrects the application rate on each disc with a variance of less than 1% when comparing desired application to actual application.
They are available in two UHPLC configurations: 2.7 [micro]m superficially porous particles for high-resolution and low backpressure (stable to 600 bar), and 1.8 [micro]m for highest resolution, stable to 1200 bar.
Perhaps the most common issue that labs encounter when using [beta]-glucuronidase is an increase in HPLC/UHPLC column backpressure due to incomplete removal of the enzyme prior to injecting the sample onto the column.
Shot volume is injected against backpressure and metered via a high resolution linear scale.
The problem was that the pumps were constantly breaking down due to excess backpressure on the mechanical seals, and being obsolete the repairs and maintenance were becoming costly and irritating.