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Pressure gradient between alveoli and body surface...expands the lung and chest wall
Pressure gradient between alveoli and pleural space..maintains alveolar inflation.
Things that decrease diameter of airway
bronchospasm..inflammation(edema)..increase in secretions,,ET tube
Negative Pressure Ventilators(Iron Lung)
INHALE mouth pressure > Alveolar pressure...Gas flows into lungs EXHALE Negative pressure removed, passive exhalation
High Freq. Ventilation
Ventilator that provides High Resp. Rate, Low Volumes..PISTON pushes gas in on I...draws gas out on E
Plateau Pressure (Pplateau)
Set for one sec. Breath hold at the end of Inspiration...measures pressure with NO gas flow .TRUE PICTURE OF LUNG COMPLIANCE(STIFFNESS)
4 factors that change the ability of air to flow through the conducting airways
1 gas viscosity, 2 gas density 3 diameter of the tube 4 flow rate of the gas
increased resistance of 13-18
indicates disease such as emphysema and asthma and other obstructive disorders
less pressure in alveoli, smaller volume of gas available for gas exchange. Accessory muscle use, for breathing.
A lung with increased resistance..
fills slowly, if normal amount of time is allowed, the lung will receive less volume
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