Sixty minutes after a patient is extubated,an arterial blood gas sample is drawn;the results are: pH = 7.20,PaCO₂= 60 mm Hg,PaO₂ = 55 mm Hg,SaO₂= 80%,HCO₃^- = 23 mEq/L with a 2 L/min nasal cannula.The patient is SOB and complaining of chest pain.His blood pressure is 92/50 mm Hg.The most likely cause of this weaning failure is which of the following?

Question

Quizplus · Accepted Answer

Patients who do well for 30 to 60 minutes after extubation and then fail weaning because of acute respiratory acidosis,hypoxemia,hypotension,and chest pain are likely to have acute left ventricular failure.This occurs because of increased preload,which is due to the decreased pulmonary capillary compression that occurs when intrathoracic pressure is reduced as a result of being off the ventilator.

Sixty Minutes After a Patient Is Extubated,an Arterial Blood Gas