A man with alcoholic cirrhosis and a hemoglobin concentration of 10 g/dl has an intraoperative PaO2 of 75 mmHg at an FiO2 of 0.5. Which of the following is the most likely cause of the low PaO2?
When treating reflex sympathetic dystrophy of an arm, which of the following is the best indicator of a successful sympathetic blockade?
(A) A pinprick sensory deficit in the distribution of C6
(B) A 5°C increase in the temperature of the skin of the hand
(C) An accentuated psychogalvanometric response in the forearm
(D) An ipsilateral positive Horner's syndrome
(E) Decreased temperature sensation in the hand
B
In the supraclavicular region, the brachial plexus
(A) is anterior to the apex of the pleura
(B) is anterior to the subclavian artery
(C) is posterior to the medial scalene muscle
(D) is enclosed in a sheath with the subclavian vein
(E) no longer contains fibers from the Tl nerve root
A
The following hemodynamic values are obtained two hours after coronary artery bypass surgery: Cardiac index 1.7 L/min/m2; Pulm Art. Occ. Pressure 22 mmHg; MAP 60 mmHg; Urine volume 0.2 ml/kg/hr. The most appropriate management is
During general anesthesia using a modern anesthesia machine, a patient's spontaneous ventilation is manually assisted with a fresh gas flow of 5 L/min. A sudden malfunction of the pressure-relief (pop-off) valve of the circle absorption system occurs, and the valve cannot be opened. The most appropriate next step is to