Snapshot A 62-year-old man presents to the emergency department for increased confusion and a productive cough. He was found on the couch by his children and was only oriented to person but not place or time. Medical history is significant for chronic obstructive pulmonary disease and hypertension. He smokes approximately 1.5 packs of cigarettes a day for the past 35 years. His temperature is 101.4°F (38.5°C), blood pressure is 157/98 mmHg, pulse is 110/min, respirations are 17/min, and oxygen saturation is 83% on room air. An arterial blood gas is performed and demonstrates a pH of 7.21, PaCO2 of 99 mmHg, and PaO2 of 51 mmHg. (Chronic obstructive pulmonary disease exacerbation) Introduction Definition login to view 4 more bullets Procedure login to view 3 more bullets Interpretation login to view 47 more bullets