A 6-year-old child with asthma begins wheezing during anesthesia with halothane and nitrous oxide in oxygen. A loading dose of aminophylline is administered followed by continuous infusion. Premature ventricular contractions appear on the ECG. The most appropriate management is to
(A) administer fentanyl
(B) discontinue aminophylline
(C) increase exhalation time
(D) increase the inspired concentration of halothane
A 64-year-old man with diabetes mellitus well controlled with NPH insulin undergoes lower extremity revascularization. Following administration of protamine 10 mg, the patient has facial flushing and blood pressure of 60/30 mmHg. The most appropriate initial step in management is administration of which of the following drugs?
Evaluation of a postoperative neurologic deficit discloses inability to oppose the thumb and little finger, weakness of abduction of the thumb, and loss of flexion of the distal phalanx of the index finger. This problem is most likely related to
(A) paresthesia occurring during an interscalene brachial plexus block
(B) attempted radial artery cannulation at the wrist
(C) inadequate padding under the elbow
(D) attempted venipuncture in the antecubital fossa
(E) abduction of the upper humerus against an "ether screen"
D
The most important factor regulating blood flow to ischemic cerebral tissue is
A 20-kg, 6-year-old boy is undergoing strabismus surgery under anesthesia with sevoflurane, nitrous oxide, and oxygen. The heart rate suddenly decreases from 85 to 40 bpm. Which of the following is the most appropriate first step in management?
A 76-year-old patient is restless and hallucinating in the preoperative holding area. He received morphine 5 mg and scopolamine 0.4 mg intramuscularly as premedication and is now breathing oxygen 2 L/min through nasal prongs. SpO2 is 98%. Which of the following is the most appropriate next step?
(A) Administration of naloxone
(B) Administration of physostigmine
(C) Induction of general anesthesia
(D) Determination of serum electrolyte concentrations