Why is Burkitt lymphoma such an aggressive malignancy?
a. Cells readily metastasize to bone marrow.
b. Cells have a high proliferative rate.
c. Cells fail to mature to functional immunophenotype.
d. Cells destroy red cells.
ANS: B
Burkitt lymphoma cells have a high proliferative rate, with a very short doubling time; almost all the malignant cells are in active phases of the cell cycle at any one time.
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The diagonal arteries of the left coronary artery supply blood to the:
A) anterolateral wall of the left ventricle B) inferior wall of the left ventricle C) superior wall of the left ventricle D) all of the above
The respiratory therapist preparing to insert an arterial line in the right radial artery performs an Allen test. The result of the Allen test is 20 seconds. The respiratory therapist should do which of the following?
a. Insert the cannula into the right radial ar-tery. b. Repeat the Allen test on the right hand. c. Perform an Allen test on the left hand. d. Recommend a surgical cut down at the right radial site.