A patient is undergoing exploration of a stab wound to the left side of the neck. On awake laryngoscopy, the left vocal cord is in midposition and the right vocal cord is abducted during inspiration. The most likely cause of these findings is trauma to which of the following structures on the left?
Six months after repair of a lacerated peroneal nerve, a patient has electric-shock-like pain when pressure is applied to the middle of the gastrocnemius muscle. The most appropriate initial management is
A 70-kg 78-year-old man undergoing small-bowel resection during anesthesia with isoflurane in oxygen becomes hypotensive and develops frothy pink sputum in the endotracheal tube. Heart rate is 50 bpm, blood pressure is 75/60 mmHg, pulmonary artery occlusion pressure is 22 mmHg, and cardiac output is 1.7 L/min. The most appropriate initial step in management is administration of which of the following?
To measure the contribution of intrapulmonary shunting to arterial hypoxemia, which of the following measurements are necessary? (Assume normal cardiac output and anatomy.)
(A) PaC02 and PeC02
(B) PaC02 and Pe02 while breathing pure oxygen
(C) Pa02 and Pv02 while breathing pure oxygen
(D) Pa02 while breathing both room air and pure oxygen
(E) Pa02 and PaC02 while breathing room air
C
If minute ventilation is held constant, which of the following is LEAST likely to alter PaCO2?