What is the primary purpose of negative pressure wound therapy?

• A. Remove necrotic tissue only
• B. Reduce wound edema and promote granulation
• C. Seal the wound to prevent any drainage
• D. Eliminate all moisture from the wound

Answer: (B)

Negative pressure wound therapy works by applying controlled suction to a sealed wound dressing, creating a vacuum environment that drains excess fluid from the wound bed. This removal of edema and exudate lowers interstitial pressure, improves local blood flow and oxygen delivery, and, through the mechanical forces of suction, stimulates granulation tissue formation and helps draw wound edges together. These effects together create favorable conditions for healing, which is why reducing wound edema and promoting granulation is the best description of its primary purpose. It isn’t solely about removing dead tissue, sealing the wound to stop drainage, or eliminating all moisture; it’s about managing fluid and stimulating tissue growth to support healing.