10 Random Questions
Which of the following statements concerning carbon monoxide poisoning is true?
- (A) Diagnosis is excluded if the PaO2 is greater than 300 mmHg while breathing 100% oxygen
- (B) Increased inspired oxygen concentration accelerates displacement of carbon monoxide from hemoglobin
- (C) Methylene blue decreases binding of carbon monoxide to hemoglobin
- (D) Pulse oximetry accurately reflects hemoglobin oxygen saturation
- (E) Tissue oxygen delivery is normal
A 45-year-old patient with chronic alcoholism develops jaundice four days after a cholecystectomy under halothane/morphine general anesthesia. Bilirubin and alkaline phosphatase are elevated, but ALT is only slightly above normal. All values were within normal limits preoperatively. The most likely cause of jaundice is
- (A) opioid-induced spasm of the sphincter of Oddi
- (B) hepatic dysfunction secondary to halothane exposure
- (C) worsening of underlying chronic hepatitis
- (D) extrahepatic biliary obstruction
- (E) acute viral hepatitis
The syndrome of inappropriate ADH secretion is characterized by
- (A) ADH secretion unrelated to serum osmolality
- (B) decreased ADH secretion in response to hypovolemia
- (C) highly dilute urine
- (D) hypernatremia
- (E) negative water balance
During acute normovolemic hemodilution in an adult, which of the following compensatory mechanisms is most important in maintaining tissue oxygenation?
- (A) Increased cardiac output
- (B) Increased oxygen extraction
- (C) Increased synthesis of erythropoietin
- (D) Redistribution of regional blood flow
- (E) Shift of the oxyhemoglobin dissociation curve
Which of the following is the most likely effect of administration of magnesium sulfate in a patient with preeclampsia?
- (A) Decreased motor end-plate sensitivity to acetylcholine
- (B) Decreased uteroplacental blood flow
- (C) Increased platelet aggregation
- (D) Increased systemic vascular resistance
- (E) Inhibited acetylcholinesterase
A 68-year-old man has a permanent DVI pacemaker that has been functioning appropriately. Which of the following is most likely to cause conversion to VOO pacing?
- (A) Electroconvulsive therapy
- (B) Insertion of a pulmonary artery catheter
- (C) Placement of a magnet over the pulse generator
- (D) Use of electrocautery near the pacemaker
- (E) Shivering
Which of the following interventions is most effective in preventing neurologic injury resulting from global cerebral ischemia?
- (A) Induction of barbiturate coma prior to ischemia
- (B) Maintenance of serum glucose concentration greater than 200 mg/dl prior to ischemia
- (C) Induction of hypothermia to a core temperature of 15 degrees C prior to ischemia
- (D) Maintenance of PaCO2 less than 25 mmHg following ischemia
- (E) Prevention of systemic hypertension following ischemia
Which of the following differentiates midazolam from diazepam administered intravenously in equipotent doses?
- (A) Greater hemodynamic stability
- (B) Lack of active metabolites
- (C) Less respiratory depression
- (D) Longer duration of action
- (E) More rapid onset
The most likely cause of this capnographic tracing obtained just after laryngoscopy and intubation is
- (A) esophageal intubation
- (B) partial obstruction of the endotracheal tube
- (C) pulmonary embolus
- (D) insertion of an endotracheal nasogastric tube
- (E) mild bronchospasm
A patient with lumbar disk disease requires lumbar epidural injection of a corticosteroid for control of low back pain. Which of the following statements concerning this treatment is true?
- (A) Maximum effect occurs one hour after injection
- (B) Maximum effect occurs when drug concentration peaks in cerebrospinal fluid
- (C) Maximum effect occurs during the acute phase of the disease
- (D) The beneficial effect results primarily from sympathetic neurolysis
- (E) It is contraindicated if the patient has had prior surgical procedures on the lumbar disks