A patient with COPD is being administered IPPB therapy for atelectasis.Oxygen is being used as the source gas.During the therapy the patient becomes lethargic and drowsy,and the patient's respiratory rate decreases from 20 to 6/minute.What is the most likely reason for this occurrence?

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With interruption of the hypoxic drive,patients often become very lethargic and drowsy.Spontaneous respiratory rate and depth decrease markedly.If the reaction is severe,the patient may go into respiratory arrest.The administration of IPPB may precipitate an episode of hypoventilation that is not evident for some time.A patient who experiences a significant drop in tidal volume and respiratory rate following therapy,with the foregoing signs and symptoms,should be closely observed.

A Patient with COPD Is Being Administered IPPB Therapy for Atelectasis.Oxygen