The arterial waveform and EKG shown are from a 60-year-old man with uremia who is the PACU after hip surgery under general anesthesia. The patient is drowsy, extubated, and breathing easily. The most likely diagnosis is
(A) hypovolemia
(B) myocardial ischemia
(C) nontension pneumothorax
(D) pericardial tamponade
(E) pulmonary embolus
D
Each of the following conditions can be accurately evaluated with transesophageal echocardiography EXCEPT
Five minutes after initiating one-lung ventilation using a double-lumen endobronchial tube, a 70-year-old patient has a decrease in Sp02 from 99% to 90%. Tidal volume and respiratory rate are unchanged. Fiberoptic bronchoscopy verifies appropriate positioning of the tube. Which of the following is the most likely cause of the desaturation?
(A) Blood flow to the nondependent lung
(B) Failure of hypoxic pulmonary vasoconstriction in the dependent lung
(C) Inadequate filling of the bronchial cuff
(D) Inadequate minute ventilation
(E) Surgical manipulation of the nondependent lung
Brain death following prolonged barbiturate coma is best confirmed by
(A) electroencephalography
(B) cerebral angiography
(C) neurologic examination
(D) physostigmine trial
(E) measurement of cortical evoked potentials
B
A 32-year-old man is scheduled for hernia repair. He underwent heart transplantation for cardiomyopathy five years ago. Which of the following findings is most likely?
(A) Absence of coronary atherosclerosis
(B) Biventricular hypokinesis on echocardiography
(C) Down-regulation of cardiac beta-adrenergic receptors