10 Random Questions
An apneic adult is receiving an oxygen flow of 4 L/min through a rigid bronchoscope. After five minutes of apnea, which of the following findings is most likely?
- (A) A decrease in cardiac output
- (B) A decrease in pulmonary vascular resistance
- (C) A decrease in SpO2 from 99% to 89%
- (D) An increase in PaCO2 of 18 mmHg
- (E) Serum bicarbonate concentration of 30 mEq/L
Which of the following is the most likely effect of long-term exposure to nitrous oxide at a concentration of 50 ppm?
- (A) Impaired cognitive function
- (B) Inhibition of vitamin B-12 absorption
- (C) Megaloblastic changes in bone marrow
- (D) Teratogenesis
- (E) Thrombocytopenia
Peak airway pressure increases from 25 to 50 cmH2O when beginning right endobronchial ventilation with a right double-lumen tube. The most likely explanation for this increase is
- (A) failure to decrease tidal volume
- (B) inadvertent intubation of the left mainstem bronchus
- (C) intrinsic resistance of small endobronchial lumina
- (D) obstruction of the orifice of the right upper lobe
- (E) overinflation of the bronchial tube cuff
Which of the following inhalational anesthetics best relieves left ventricular outflow obstruction in a patient with hypertrophic obstructive cardiomyopathy (IHSS)?
- (A) Desflurane
- (B) Halothane
- (C) Isoflurane
- (D) Nitrous oxide
- (E) Sevoflurane
A patient is bleeding excessively after routine transurethral resection of the prostate. Re-exploration discloses diffuse oozing. The most appropriate management is administration of
- (A) platelets
- (B) fresh frozen plasma
- (C) desmopressin
- (D) epsilon-aminocaproic acid
- (E) cryoprecipitate
Pulmonary artery diastolic pressure is an unreliable indicator of left ventricular end-diastolic pressure in patients with
- (A) acute cardiogenic pulmonary edema
- (B) aortic stenosis
- (C) acute mitral regurgitation
- (D) myocardial ischemia
- (E) severe emphysema
The flow-volume loop shown is most likely from a patient with which of the following?
- (A) Bilateral vocal cord paralysis
- (B) Chronic bronchitis
- (C) Tracheal stenosis six months after a previous tracheostomy
- (D) Tumor of the lower trachea
- (E) Normal respiratory status
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
A patient being mechanically ventilated in the ICU requires wound debridement twice daily. Each of the following agents would be appropriate for induction of brief general anesthesia EXCEPT
- (A) nitrous oxide
- (B) etomidate
- (C) ketamine
- (D) methohexital
- (E) midazolam
Each of the following statements concerning norepinephrine is true EXCEPT:
- (A) Extraneuronal uptake is important in the termination of its activity
- (B) It is formed from dopamine
- (C) Its release is facilitated by ephedrine
- (D) Its uptake is affected by cocaine
- (E) It has minimal beta2-adrenergic activity