Blood Pressure Monitors

موضوع: Blood Pressure Monitors الجمعة فبراير 05, 2010 9:02 pm

Blood Pressure Monitors

What does it do
It measures the pressure in the veins or arteries.

Physiology
When the heart beats, it pumps blood to the body through the arteries. The blood then returns to the heart through the veins. The amount the heart contracts, the volume of the blood and the diameter of the blood vessels all determine the pressure inside the vessels

How it works
A narrow fluid filled tube is inserted into a blood vessel. The end of the tube is connected to a pressure sensor. The pressure in the vessel pressurises the fluid in the tube and the pressure sensor measures this. The pressure sensor sends an electrical signal to the monitor, which displays the pressure on a screen

An invasive blood pressure machine is also used to measure other pressures inside the body such as intracranial pressure (the fluid around the brain), intrapleural (between the lung tissue and the ribs) and gastro-intestinal pressures (inside the stomach or intestines)

Units of measurement
mmHg

Typical values
Venous: mmHg
Systolic: 120 mmHg
Diastolic: 80 mmHg
Mean arterial: 100 mmHg

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