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Respiratory Part 2
Question | Answer |
---|---|
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 |