A 32-year-old woman is anesthetized for suboccipital craniotomy. During positioning, the capnograph shows an abrupt decrease in the slope of the expiratory upstroke. Which of the following is the most likely cause?
During pulmonary artery catheterization, a 65-year-old man receives morphine 6 mg and scopolamine 0.4 mg intravenously. The pulse oximeter indicates desaturation, which quickly resolves with stimulation. When the drapes are removed, he has unilateral eye pain, decreased visual acuity, and dilated and irregular pupils. These eye symptoms are most likely caused by
Peak airway pressure increases from 25 to 50 cmH2O when beginning right endobronchial ventilation with a right double-lumen tube. The most likely explanation for this increase is
(A) failure to decrease tidal volume
(B) inadvertent intubation of the left mainstem bronchus
(C) intrinsic resistance of small endobronchial lumina
(D) obstruction of the orifice of the right upper lobe
A healthy, 18-year-old, 65-kg woman undergoing diagnostic laparoscopy is being monitored with a properly functioning and calibrated capnograph. The end-tidal carbon dioxide concentration is 6%, and the inspired carbon dioxide concentration is 1%. This may be caused by each of the following EXCEPT
(A) malfunction of the expiratory valve in a circle system
(B) low gas inflow with a Bain circuit
(C) exhausted soda lime within a circle system
(D) absorption of carbon dioxide from carbon dioxide laparoscopy