Question

A PET scan reveals that an individual's cancer has spread to the cervical and axillary lymph nodes on the patient's left side only. To prevent further spread, all of the lymph nodes from the left side cervical and axillary regions are surgically removed. The patient is surprised to receive an wristband that reads "No Blood Draw or Vaccines on this Arm" that he must wear for the rest of his life. Why would having blood drawn or vaccines being given in that arm be problematic, but wouldn't be problematic if having blood drawn from the right arm?

Answer 1

One reason may be to improve the circulation of vaccine throughout the body from a normal circulation side (right side) as the circualtion in the lymphatic system on the left side is not normal.

Another reason could be chances for lymphedema followed by cancer treatment. Any injection or pricking with needle might lead to swelling and complicated lymphedema.

Lymph nodes are seen surrounded by lymph vessels. As part of cancer treatment, when lymph nodes are removed, lymph vessels that carry fluid from that area to the rest of the body are also taken out. Taking out lymph nodes and vessels makes it harder for the lymph fluid in the arms, legs, or other body parts to flow to the chest where it can get back into the bloodstream. If the remaining lymph vessels cannot remove enough of the fluid in the area, the fluid builds up and causes swelling, or lymphedema.

As the lymphatic system in the above patient functions normally on his right side, the selection of right side of the body for vaccine administration and withdrawing of blood is having priority.