Final answer:
The purpose of the foam, polyvinyl alcohol (PVA) dressing is to prevent wound maceration.
Step-by-step explanation:
The purpose of the foam, polyvinyl alcohol (PVA) dressing applied after a patient receives negative-pressure wound therapy (NPWT) is to prevent wound maceration. Wound maceration occurs when excessive moisture accumulates around the wound, which can delay healing and increase the risk of infection. The foam dressing helps absorb excess moisture from the wound and create an environment conducive to healing.