Twenty minutes after an axillary block, the patient reports feeling over the "back of the hand." Examination shows normal sensation over the lateral aspect of the dorsum of the hand and the dorsal base of the thumb and index finger. Supplementary anesthesia of this area can be provided by blocking which of the following nerves?
Percutanous cordotomy is being considered for a patient with severe pain that has persisted for three months after amputation of the arm for osteogenic sarcoma. Which of the following statements is true?
(A) An effective cordotomy will produce motor block
(B) A series of stellate ganglion blocks will provide permanent relief
(C) Cordotomy must be performed with the patient awake
(D) Cordotomy will effectively relieve phantom limb pain
(E) Spinal opioids are an alternative treatment of this pain
Which of the following statements concerning use of temperature-corrected blood gas measurement (pH-stat) during hypothermic cardiopulmonary bypass is true?
(A) Blood gas analysis is performed at the patient's temperature
(B) Carbon dioxide should not be added to the bypass circuit
(C) The carbon dioxide content of the patient's blood is greater than it would be without temperature correction
(D) The incidence of postoperative neurologic deficits is increased compared with the alpha-stat method
(E) The patient's temperature should be maintained above 25°C
In a patient with severe mitral stenosis, induction of anesthesia must include avoidance of increased
(A) airway pressure
(B) heart rate
(C) myocardial contractility
(D) right ventricular preload
(E) systemic vascular resistance
B
A patient has sudden cardiopulmonary arrest five minutes after retrobulbar block with 0.75% bupivacaine 2 ml with hyaluronidase for ophthalmologic surgery. No premonitory changes were noted on the pulse oximeter. The most likely cause is
(A) allergic reaction to hyaluronidase
(B) direct cardiac toxicity
(C) oculocardiac reflex
(D) intravenous injection of local anesthetic
(E) subarachnoid injection of local anesthetic
E
In patients with blunt head trauma, cerebral perfusion pressure is determined by the gradient between
(A) diastolic pressure and central venous pressure
(B) intracranial pressure and central venous pressure
(C) mean arterial pressure and central venous pressure
(D) mean arterial pressure and intracranial pressure