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Review Question - QID 212648

Opiates QID: 212648 (M2.OMB.19.2)
In scope icon M 6 B
QID 212648 (Type "212648" in App Search)
A 24-year-old man is brought to the emergency department by the police. He was found unconscious and covered in bruises outside of a local bar. The patient has a past medical history of polysubstance abuse, depression, multiple suicide attempts, neuropathic pain, and schizophrenia. As part of the patient’s initial workup, a head CT is performed which is unremarkable, and an arterial blood gas is performed as seen below:

pH: 7.29
PaCO2: 95 mm Hg
PaO2: 70 mm Hg
Bicarbonate: 24 mEq/L

Which of the following is the most likely etiology of this patient’s current presentation?
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