A 70-year-old man sustains injuries to both carotid bodies during bilateral carotid endarterectomies performed four days apart. Two hours after the second procedure, the patient is breathing room air in the PACU. Which of the following sets (pH, pCO2, pO2) of arterial blood gas values is LEAST likely?
(A) 7.3 50 58
(B) 7.3 50 86
(C) 7.4 40 86
(D) 7.4 42 58
(E) 7.5 32 58
E
In a spontaneously breathing patient, each of the following increases the work of breathing EXCEPT
(A) an increase in respiratory rate by 10/min
(B) a decrease in lung-thorax compliance by 10 cmH2O
(C) an increase in carbon dioxide production by 1 ml/kg/min
(D) a decrease in PaO2 from 80 to 65 mmHg
(E) a 0.1 increase in the ratio of dead space to tidal volume
Arterial oxyhemoglobin desaturation develops more rapidly following apnea in a pregnant patient at term than in a nonpregnant patient with a large intra-abdominal tumor. Which of the following findings in pregnancy is the most likely cause?