Final answer:
The edema in the upper extremity following a Mastectomy is likely due to impaired lymphatic drainage after lymph nodes and vessels are removed or damaged during the procedure.
Step-by-step explanation:
If a client has had a Mastectomy and is experiencing edema in the upper extremity on the same side as the Mastectomy, this condition is likely due to the disruption of the lymphatic drainage system. During a Mastectomy procedure, lymph nodes and lymphatic vessels may be removed or damaged, leading to an accumulation of lymph fluid in the tissue of the arm, which can cause swelling and edema. Edema, the accumulation of excess water in the tissues, often occurs in the extremities and is usually a sign of an underlying condition. In this case, the mastectomy-induced damage to the lymphatic system is the underlying issue. Treatment for such edema generally includes therapies targeting the cause, such as exercises, elevation of the affected limb, massage, compression, and dietary modifications.