A 59-kg IBW female patient is being mechanically ventilated in the CMV mode,f = 12/min,Vᴛ = 400 mL,PEEP = 5 cm H₂O,FɪO₂ = 0.5.The ABG results on these settings show a respiratory acidosis and severe hypoxemia.The respiratory therapist increases the set Vᴛ and increases the PEEP to 12 cm H₂O.The resulting ABGs show improved oxygenation,but the patient still has a respiratory acidosis.The respiratory acidosis may be due to which of the following?

Question

Quizplus · Accepted Answer

If an increase in alveolar ventilation does not correct a respiratory acidosis,the condition is usually caused by pulmonary embolism,low pulmonary perfusion,or increased dead space.The reduction in pulmonary blood flow caused by high alveolar pressures can increase dead space.In this patient's case,the increase in PEEP is most likely the reason for the continued respiratory acidosis.

A 59-Kg IBW Female Patient Is Being Mechanically Ventilated in the CMV