05-08-2008, 06:37 AM
Q1
Four days after admission to the hospital with multiple fractures sustained in a motor vehicle collision, a 27-year-old man has the sudden onset of shortness of breath. His respirations are 30/min. Doppler ultrasonography of the lower extremities shows deep venous thrombosis, and a spiral CT scan of the chest shows evidence of multiple subsegmental pulmonary emboli. Anticoagulant therapy is begun. One week later, a follow-up CT scan of the chest is done to evaluate atypical chest pain. Results show no abnormalities, and the pain was considered to be musculoskeletal. Collateral circulation from which of the following best explains the lack of identifiable pulmonary parenchymal infarcts in this patient?
A ) Bronchial arteries
B ) Bronchial veins
C ) Pulmonary arteries
D ) Pulmonary veins
E ) Superior vena cava
Q2
An investigator is evaluating the outcome of coronary artery bypass grafting conducted by two surgeons in the community in the past year. Surgeon X, who operates exclusively at a tertiary-care facility, has a 30-day operative mortality of 3%. Surgeon Y, who operates exclusively at a community care facility, has a 30-day operative mortality of 1%. The difference in operative mortality between surgeon X and surgeon Y is significant (p
Four days after admission to the hospital with multiple fractures sustained in a motor vehicle collision, a 27-year-old man has the sudden onset of shortness of breath. His respirations are 30/min. Doppler ultrasonography of the lower extremities shows deep venous thrombosis, and a spiral CT scan of the chest shows evidence of multiple subsegmental pulmonary emboli. Anticoagulant therapy is begun. One week later, a follow-up CT scan of the chest is done to evaluate atypical chest pain. Results show no abnormalities, and the pain was considered to be musculoskeletal. Collateral circulation from which of the following best explains the lack of identifiable pulmonary parenchymal infarcts in this patient?
A ) Bronchial arteries
B ) Bronchial veins
C ) Pulmonary arteries
D ) Pulmonary veins
E ) Superior vena cava
Q2
An investigator is evaluating the outcome of coronary artery bypass grafting conducted by two surgeons in the community in the past year. Surgeon X, who operates exclusively at a tertiary-care facility, has a 30-day operative mortality of 3%. Surgeon Y, who operates exclusively at a community care facility, has a 30-day operative mortality of 1%. The difference in operative mortality between surgeon X and surgeon Y is significant (p