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What is the difference between positive and negative pressure ventilation?
Positive pressure ventilation is the system in
which the external pressure of air (outside the body) is higher than the internal pressure of air inside the lungs to
draw the air in the lungs. While negative pressure inhaling is another system in which the external pressure of air is
lower (outside the body) than the internal pressure of air inside the lungs in order to draw air out of the lungs.
Negative pressure ventilation is used in the air lung which is used of polio patients as due to their paralysis are unable
In the air lung, the patient lies in a metal cylinder with
their head sticking out. Through a chamber the air inside the metal cylinder is taken out creating a low pressure and as
a result, the chest wall of the patient moves up increasing the volume and the decreasing the pressure inside the
body, which allows air to be drawn in by the lungs. The vacuum automatically switches off, allowing the air to move
back inside the chamber, increasing the pressure. The ribs move down lowering the volume and increasing the
pressure inside the thorax. In this way the air is moved in and out of the lungs.
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In positive pressure ventilation, a face mask or a tube going down the trachea is used in which a measured breath of
air is carefully forced down your throat. Once the lungs of the patient are fully inflated, the air pressure stops. The
lungs then deflate as the ribs move down again and forcing the air out.…read more