A 26-year-old woman comes to a pain clinic because of pain, swelling and limitation of motion in the right knee for six months following a blow to the knee. Findings on knee arthroscopy and leg roentgenograms are normal. The best trial of therapy is
(A) right paravertebral lumbar sympathetic nerve block
(B) epidural administration of a steroid
(C) intrathecal administration of an opioid
(D) tricyclic antidepressants for one month
(E) a nonsteroidal anti-inflammatory drug for five days
Which of the following is LEAST likely to decrease myocardial oxygen supply?
(A) Administration of enflurane
(B) Epidural anesthesia to a sensory level of T6
(C) Increased pulmonary artery occlusion pressure
(D) Hypocarbia (PaCO, 25 mmHg)
(E) Metabolic acidosis (pH 7.20)
E
An 8-kg, 5-month-old infant undergoes craniotomy for an arteriovenous malformation. During the procedure, severe hemorrhaging occurs and packed red blood cells 3 units are transfused rapidly. During infusion of the third unit, hypotension, nodal bigeminy, and prolongation of the QT interval are noted. The most appropriate management includes administration of
A 30-year-old primiparous woman delivered a healthy infant by cesarean section during uneventful spinal anesthesia with tetracaine 10 mg in 2 ml of 5% dextrose solution. Twelve hours after delivery she has bilateral loss of pain and temperature sensibility, but not touch, below T8 and paralysis of both legs. The most likely cause of this complication is
Which of the following findings on the left is most likely to be associated with an increased risk of complications with cannulation of the left internal jugular vein compared with cannulation of the right internal jugular vein?
(A) Longer recurrent laryngeal nerve
(B) Lower location of the cupola of the pleura
(C) More acute angle between the internal jugular and innominate veins
During an inguinal hernia repair, a newborn infant will have a larger fluid requirement (in milliliters per kilogram) than an adult because of relatively greater