Which of the following muscle relaxants is most likely to result in histamine release following administration of a bolus dose sufficient to facilitate rapid endotracheal intubation?
An isoflurane-specific vaporizer that is 25% full is mistakenly refilled with halothane, and the dial is set at 1.5%. Which of the following statements concerning this situation is true?
(A) The gas mixture will contain equal partial pressures of halothane and isoflurane
(B) The gas mixture will produce a greater depth of anesthesia than 1.5% isoflurane alone
(C) The gas mixture will produce a greater depth of anesthesia than 1.5% halothane alone
(D) The liquid mixture will have a higher vapor pressure than 1.5% halothane alone
(E) The liquid mixture will have a higher vapor pressure if it is placed in a halothane-specific vaporizer
Two opened oxygen cylinders, one full and one empty, are attached to an anesthesia machine. The check valve to the empty cylinder fails. This is expected to result in
(A) activation of the fail-safe device
(B) cessation of oxygen flow to the anesthesia circuit
(C) filling of the empty cylinder with a mixture of all gases supplied to the anesthesia machine
(D) increase in the temperature of the empty cylinder
(E) interruption of gas delivery from the central oxygen source
A 52-year-old woman undergoes facial surgery during general endotracheal anesthesia. The ventilator is set to deliver a tidal volume of 600 ml and a respiratory rate of 10/min at an FiO2 of 1.0. SpO2 is 100%, peak inspiratory pressure is 18 cmH2O, and PetCO2 is 40 mmHg. The surgeon flexes the patient's head so the chin touches the chest. Which of the following findings indicates that endobronchial intubation has NOT occurred?
(A) Fluctuating capnographic waveform
(B) Greater expiratory volume than inspiratory volume
A 45-year-old man is scheduled for exploratory laparotomy. Six months ago, he received doxorubicin (Adriamycin) therapy for testicular cancer. This patient is at increased risk for
Pulmonary artery occlusion pressure is NOT a reliable estimate of left ventricular end-diastolic pressure when
(A) junctional cardiac rhythm is present
(B) mitral insufficiency is present
(C) pulmonary compliance is decreased
(D) pulmonary hypertension is present
(E) the catheter tip is in zone 1 of the lung
E
An otherwise healthy 20-year-old man undergoes laser surgery for vocal cord polyp removal. During jet ventilation with 100% oxygen, arterial blood gas analysis shows PaO2 90 mmHg, PaCO2 40 mmHg, and pH 7.40. Which of the following is the most likely explanation?