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 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.
For the liquid phase, when the back pressure was 40kPa, the intensity percentage of mode 1 was larger than 93% which means that the spray was very stable under low back pressure conditions.
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 silica columns provide fast separations at moderate back pressures, with similar efficiency compared to particle-based columns.
Because the setpoint is manual, it is set to create enough back pressure to pressurize the highest point in the chilled water system.
"This is a normal back pressure release mechanism, which happens when pressure builds up in the furnace," he told the GDN.
Report results include required chain pull, motor speed, torque, shaft power and maximum line back pressure. During the process, the software sends alerts for incompatible parameter inputs.
The In-Line Check Valve is a DEHP-free, acrylic valve featuring a Latex Free silicone diaphragm that allows flow in one direction and will prevent retrograde flow (back pressure tested to 45 psi).
VARICOSE VEINS These are knobbly swellings of veins where blood pools due to back pressure and damage to valves within the veins that prevent backward flow of blood.
Without the M3 installed, there's not enough back pressure to fire SRTA continually.
These included increasing the back pressure, increasing the color concentrate loading, and positioning a static mixer inside the nozzle.