A 24-year-old woman with abruptio placentae at 38 weeks' gestation has bleeding at the site of the intravenous catheter. Which of the following is the most likely cause?
(A) Diffuse vasculitis
(B) Disseminated intravascular coagulation
(C) Isolated factor VIII deficiency
(D) Primary fibrinolysis
(E) Vitamin K deficiency
B
Addition of 20 cmH2O positive end-expiratory pressure to a patient receiving controlled mechanical ventilation decreases cardiac output and left ventricular function by
Three hours after total thyroidectomy, a 33-year-old man develops inspiratory stridor. The most likely cause is
(A) hematoma formation
(B) tracheomalacia
(C) tetany
(D) recurrent laryngeal nerve injury
(E) superior laryngeal nerve injury
A
In the supraclavicular region, the brachial plexus
(A) is anterior to the apex of the pleura
(B) is anterior to the subclavian artery
(C) is posterior to the medial scalene muscle
(D) is enclosed in a sheath with the subclavian vein
(E) no longer contains fibers from the Tl nerve root
A
A 1150-g, 10-day-old infant is undergoing a bowel resection for necrotizing enterocolitis. Heart rate is 200 bpm and blood pressure measured through a femoral artery catheter is 45/24 mmHg. The most appropriate next step is administration of
A patient receives remifentanil 25 mcg just before retrobulbar block with 0.25% bupivacaine 4 mL. Over the next 10 minutes, he develops apnea and loses consciousness. Which of the following is the most likely explanation?
(A) Effects of remifentanil
(B) Injection of local anesthetic into cerebrospinal fluid
A 72-year-old man has massive venous hemorrhage during a radical prostatectomy. Blood pressure decreases from 110/60 to 75/30 mmHg and central venous pressure decreases from 12 to 4 mmHg. PetC02 decreases from 34 to 24 mmHg during constant minute ventilation. The most appropriate next step should be to
(A) apply positive end-expiratory pressure to the breathing circuit
(B) attempt to aspirate air from the central venous catheter
(C) expand intravascular volume
(D) place the patient in the Trendelenburg position
(E) turn the patient to the left lateral decubitus position
During an otherwise uneventful nitrous oxide-sevoflurane anesthetic in a spontaneously breathing patient, 85% nitrous oxide is accidently administered, resulting in a PO2 of 48 mmHg. Which of the following would be expected?