Following axillary block for insertion of an arteriovenous fistula in the forearm, a patient has pain on surgical incision. Which of the following nerves should be blocked to relieve this pain?
The capnographic tracing is from a 2-month-old infant anesthetized using a pediatric circle system and mask at a fresh gas flow of 4 L/min. The sampling port is in the elbow connector. This tracing indicates
(A) adequate alveolar ventilation
(B) exhausted soda lime
(C) expired halothane concentrations representative of alveolar concentrations
A 13-year-old African American boy has severe abdominal pain after debridement of an open fracture of the lower extremity. His hemoglobin concentration is 10 g/dl and a peripheral blood smear shows elongated crescent-shaped erythrocytes. The most appropriate initial therapy is
(A) sodium bicarbonate administration
(B) dopamine infusion
(C) blood transfusion
(D) volume loading with crystalloid
(E) high-dose corticosteroid administration
D
Recognized side effects of magnesium sulfate used for the treatment of preeclampsia that would be of anesthetic concern include each of the following EXCEPT
(A) maternal pulmonary edema
(B) neonatal hypotonia
(C) increased maternal sensitivity to succinylcholine
Ninety minutes after administration of succinylcholine 1 mg/kg to a 28-year-old woman, the train-of-four shows a T4:T1 ratio of 25%. This is most consistent with
A 26-year-old woman is hospitalized in early labor at 38 weeks' gestation. Vaginal bleeding occurred prior to admission. Systemic blood pressure remains 140/80 mmHg during intravenous infusion of fluids. Which of the following factors would contraindicate epidural anesthesia for labor at this time?
(A) Early fetal heart rate decelerations
(B) Hematocrit of 29%
(C) Blood pressure of 110/75 mmHg when sitting
(D) Platelet count of 100,000/mm3
(E) Increased respiratory rate
C
At the time of cesarean delivery, thick dark meconium is noted and the newborn is flaccid, apneic, bradycardic, and cyanotic. The most appropriate initial action is
Following pneumonectomy, a paralyzed patient being mechanically ventilated has the following arterial blood gas values: PaO2 71 mmHg, PaCO2 55 mmHg, pH 7.29. SvO2 is 45%. The most likely explanation for this SvO2 is