A patient with asthma is being ventilated in PSV, 5 cm H2O, with CPAP of 5 cm H2O. The pa-tient has chest wall retractions on most breaths and appears to have an increased WOB
The following graphic occurred the entire time the respiratory therapist was assessing the patient. What does this graphic demonstrate?
a. Trigger asynchrony
b. Mode asynchrony
c. PEEP asynchrony
d. Cycle asynchrony
ANS: A
The flow-time scalar shows that some breath initiations made by the patient are not triggering the ventilator; this is known as trigger asynchrony. In this particular patient, it could be caused by auto-PEEP. Patients experiencing asthmatic episodes have increased airway resistance, which can lead to auto-PEEP, which can affect the ventilator's ability to sense the patient's efforts.
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