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A man is found comatose in his room, having taken an unknown number of sleeping pills. An aerial blood sample yields the following values: pH 7.10, HCO3 - 12 meq/liter, PaCO2 66 mm Hg. This patient's acid - base status is most accurately described as:
Uncompensated metabolic acidosis
Uncompensated respiratory acidosis
Mixed respiratory and metabolic acidosis
Respiratory acidosis with paial renal compensation
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