Esophageal dilation: ________

A procedure used to decrease the potential for GVHD in an allogeneic transplant is:

a. Freeze thaw to kill lymphocytes b. Activation of CD4 cells and suppression of CD8 cells. c. Purge of CD8 lymphocytes d. Apheresis

A helicopter landing zone should be:

A) marked with a strobe light at the front and rear of the proposed site. B) 100 feet by 100 feet in size and on a surface that is firm, level, and free of debris. C) 50 feet by 50 feet in size and in an area that is at least 50 feet from the ambulance. D) at least a quarter of a mile from the ambulance to avoid injury from flying debris.