Final answer:
A red wound bed in a pressure ulcer suggests the presence of granulation tissue, indicating that healing is occurring through the development of new connective tissue and blood vessels.
Step-by-step explanation:
If the wound bed of a patient's pressure ulcer is red, this finding indicates to the nurse the presence of granulation tissue. Granulation tissue is a part of the normal healing process and consists of new connective tissue and tiny blood vessels that form on the surfaces of a wound during the healing process. This red tissue is a sign that the wound is healing as it should be, with increased blood flow bringing in nutrients and new cells to promote healing.