In which of the following clinical circumstances does down-regulation of beta-adrenergic receptors occur?
(A) Chronic congestive heart failure
(B) Hypothyroidism
(C) Long-term clonidine administration
(D) Long-term metoprolol administration
(E) Stable angina
A
A patient is scheduled for right pneumonectomy. A left-sided double-lumen endobronchial tube is inserted. After the endobronchial side is clamped and both cuffs are inflated, breath sounds are heard only on the left. Which of the following is the most likely cause?
(A) Herniation of the endobronchial cuff over the carina
(B) Occlusion of the right upper lobe bronchus
(C) Placement of the endobronchial lumen in the left mainstem bronchus
(D) Placement of the endobronchial lumen in the right mainstem bronchus
(E) Placement of the endobronchial lumen in the trachea
A 25-year-old woman is admitted to the hospital in the early stages of labor at term. Initial hematocrit is 33%. Which of the following is the most likely cause of the hematocrit value?
During attempted awake intubation, the patient gags when the laryngoscope presses on the base of the tongue. Which of the following cranial nerves is responsible for the afferent limb of this reflex?
A 1150-g, 10-day-old infant is undergoing a bowel resection for necrotizing enterocolitis. Heart rate is 200 bpm and blood pressure measured through a femoral artery catheter is 45/24 mmHg. The most appropriate next step is administration of
A full-term newborn has marked respiratory distress in the delivery room. Breath sounds are asymmetric and the abdomen is scaphoid. Which of the following maneuvers is most appropriate?
(A) Hyperventilation with bag and mask
(B) Intubation and ventilation with positive end-expiratory pressure
(C) Intubation and ventilation with zero end-expiratory pressure