A 70-kg patient with no acute bleeding has a preoperative platelet count of 40,000/mm3. Following preoperative transfusion of platelets 10 units, the predicted platelet count would be
A patient is hyperventilated to a PaC02 of 20 mmHg. Which of the following physiologic parameters is most likely to be increased?
(A) Airway resistance
(B) Myocardial contractility
(C) Oxygen delivery to tissues
(D) Pulmonary vascular resistance
(E) Serum ionized calcium concentration
A
In a healthy 70-kg adult, which of the following is the most likely effect of intravenous administration of morphine 10 mg on ventilatory responses?
(A) Increased response to hypoxia and decreased response to hypercarbia
(B) Decreased response to hypercarbia and no change in response to hypoxia
(C) Decreased response to both hypoxia and hypercarbia
(D) No change in response to hypercarbia and decreased response to hypoxia
(E) No change in response to hypoxia or hypercarbia
C
A 55-year-old man requires intravenous lidocaine for multifocal premature ventricular contractions occurring in the first hour after a below-knee amputation. He has alcoholic cirrhosis, portal hypertension, and ascites. Which of the following correctly describes the appropriate modification of the usual loading bolus and maintenance infusion of lidocaine?
(A) Larger bolus, faster infusion
(B) Larger bolus, slower infusion
(C) Smaller bolus, faster infusion
(D) Smaller bolus, slower infusion
(E) No change necessary
B
Which of the following laboratory studies is the best indicator of reversal of the effects of warfarin?
Following paravertebral blocks of the second through fifth intercostal nerves, numbness is noted on the medial aspect of the ipsilateral arm. The most likely cause is
(A) anesthesia of the intercostobrachial nerve
(B) anxiety-induced hyperventilation
(C) injection into a dural cuff
(D) intravascular injection of local anesthetic
(E) partial block of the brachial plexus
A
After a gastric stapling procedure, a 150-kg woman is extubated and breathing spontaneously in the recovery room at a rate of 26/min and an FiO2 of 0.5. Arterial blood gas analysis shows PaO2 96 mmHg, PaCO2 44 mmHg, and pH 7.37. The parameter most closely related to her increased alveolar-arterial oxygen tension gradient is