Final answer:
Post-mastectomy arm exercises are crucial for preventing lymphedema in the affected arm by improving circulation and lymphatic drainage, as well as maintaining range of motion.
Step-by-step explanation:
A patient post-mastectomy should exercise the affected arm to prevent lymphedema, which is fluid buildup that can cause swelling and pain. This is especially important after lymph node removal, which can alter the normal drainage of lymphatic fluid, leading to lymphedema.
Exercising the affected arm helps improve circulation, enhances lymphatic drainage, and maintains the range of motion. The movements during exercise act as a natural pump, moving fluid through the lymphatic system and preventing it from collecting in the arm.
It's worth noting that increasing blood pressure, promoting scar formation, and reducing respiratory rate are not primary goals of post-mastectomy arm exercises. While exercise can have an indirect effect on these aspects, the main objective is to reduce the risk of lymphedema and maintain arm function.