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Respiratory Part 2

How does air flow? From high pressure to low pressure
What does contraction of the respiratory muscles during inspiration lead the thoracic cavity to do? Enlarge
What does the fluid in the pleural space do? Acts as a seal between the lungs and the inside of the thoracic cavity. So when the thoracic cavity enlarges, so does the lungs
What does air movement into the lungs result from? Creation of a subatmospheric pressure in the intraalveolar space during inspiration.
What does the pressure in the intraalveolar space do at the end of inspiration? Returns to barometric pressure
During inspiration pressure in the intraalveolar decreases or increases? Decreases
Negative Pressure Respiration Normal breathing, during inspiration when you exhale, intraalveolar pressure will go into positive range
Assisted Control Mode Ventilation (ACMV) Inspiratory cycle intiated by patient or automatically if no signal detected within a specified time window
Positive End Expiratory Pressure (PEEP) By not allowing IAP to return to 0, at the end of expiration, the lung will be kept at a larger volume. Exhale into machine where pressure is already raised.
Continuous Positive Airway Pressure (CPAP) Not a true support-mode of ventilation. Breathing is spontaneous but via a circuit that is pressurized. CPAP used to maintain airway size and prevent respiratory muscle atrophy. Treats sleep apnea
Sleep Apnea Collapse of oropharynx during sleep. Obesity, increased nasopharyngeal resistance and alcohol contribute to sleep apnea.
Compare FRC for PEEP, ACMV and CPAP. BiPap? PEEP FRC is higher than ACMV. PEEP and CPAP FRC are equal. BiPap has decreased expiratory pressure compared to CPAP



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