Mechanism |

Mechanism

Sat, 12/22/2007 - 15:37 — oxygen

MECHANISM OF BREATHING: periodic exchange of gas from alveoli with fresh gas of the upper airways Listen to Audio

spontaneous ventilation mechanical ventilation anesthetic effects on ventilation removal and elimination of carbon dioxide from the blood Spontaneous ventilation General: alveolar pressure: is atmospheric and is greater than intrathoracic pressure during end expiration/inspiration pleural pressure : used as a measure of intrathoracic pressure transpulmonary pressure: equals alevolar pressure minus intrapleural pressure End expiration alveolar pressure: equal zero; no flow intraplueral pressure: equals -5 cm H20 transpulmonary pressure equal +5 cm H20 Beginning inspiration diaphragm contracts therefore chest cavity expands pressure gradient allows gas to flow from the upper airways into the alveoli alveolar pressure changes from 0 to -3 cm H20 intraplueral pressure changes from -5 cm H20 to -8 cm H20 transpulmonary pressure End inspiration new transpulmonary pressure sustains lung expansion alveolar pressure returns to zero intraplueral pressure remains decreased transpulmonary pressure 5 cm H20 Beginning expiration diaphragm relaxes elastic recoil of the lung creates a pressure gradient gas flow from alveoli to the upper airway Alveolar pressure intrapleural pressure returns to -5 cm H20 transpulmonary pressure no longer supports lung expansion Mechanical ventilation general: apply intermittent positive pressure to upper airways inspiration: gas flows into the alveoli with positive pressure until the alveolar and upper airway pressure equal Expiration positive airway pressure is either removed or decreased allows for reveral of pressure gradient (of inspiration) airflow moves from alveoli into upper airway

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