A nurse is caring for a client with a stage 3 pressure ulcer on the sacrum that is in the proliferative phase of wound healing. Which nursing intervention is most appropriate to promote optimal healing during this phase?

Maintaining a moist wound environment supports granulation tissue formation and epithelial migration during the proliferative phase. Other options (dry dressing, aggressive irrigation, keeping dry) can damage new tissue or impede healing.

Understanding the Proliferative Phase
To select the most appropriate intervention, it is essential to understand what is happening physiologically in a stage 3 pressure ulcer during the proliferative phase. A stage 3 ulcer involves full-thickness skin loss, extending into the subcutaneous tissue but not through the fascia. The proliferative phase is the second stage of wound healing, following the inflammatory phase. During this period, the wound is actively rebuilding. Key processes include angiogenesis (formation of new blood vessels), granulation tissue formation, and epithelialization. Granulation tissue, which appears beefy red and bumpy, is composed of new capillaries, fibroblasts, and a provisional extracellular matrix. These cells and structures are extremely fragile and require a specific environment to thrive ^[3].

Analysis of the Options
The correct answer is the intervention that directly supports the physiological processes of the proliferative phase.

• Option 1: Apply a dry sterile dressing to absorb excess drainage. This is incorrect. A dry dressing will adhere to the new granulation tissue. When removed, it will mechanically debride the wound, stripping away the fragile new capillaries and fibroblasts, thus reversing the healing progress .



• Option 2: Perform aggressive wound irrigation with normal saline. This is incorrect. While wound cleansing is important, "aggressive" irrigation with high pressure (e.g., from a 35 mL syringe with a 19-gauge catheter) can traumatize and destroy delicate granulation tissue. For a clean, granulating wound, gentle irrigation is indicated to avoid mechanical damage .



• Option 3: Keep the wound bed completely dry to prevent bacterial growth. This is a common misconception but is incorrect. A dry environment leads to cell desiccation and death, forming a scab that physically impedes the migration of epithelial cells across the wound surface. Healing is significantly delayed in a dry environment ^[3].



• Option 4: Maintain a moist wound environment and protect the granulation tissue. This is the correct answer. A moist wound environment is the gold standard for promoting healing in the proliferative phase. It facilitates cellular migration, supports autolytic debridement, and prevents wound bed desiccation. Modern wound dressings are designed to maintain this optimal moisture balance while protecting the new tissue from trauma and contamination .

The Critical Role of a Moist Wound Environment
The concept of moist wound healing is a cornerstone of modern wound care. Research and clinical practice have definitively moved away from drying wounds. A moist environment created by an appropriate dressing (such as a hydrocolloid, hydrogel, or foam dressing) provides several benefits that directly align with the needs of the proliferative phase. It prevents cell death by dehydration, allowing fibroblasts to synthesize collagen and endothelial cells to form new capillaries. It also creates a low-oxygen tension environment at the wound bed, which paradoxically stimulates angiogenesis ^[3]. Furthermore, the dynamic balance of the wound's microbial ecosystem, rather than complete sterility, is now recognized as a key factor in healing, and a moist environment supports this balance without promoting infection when managed correctly .

Connecting to the Provided Evidence
The rationale for maintaining a moist environment is deeply rooted in the molecular and cellular mechanisms of wound repair. The healing cascade involves complex signaling from growth factors and cytokines. For these signals to effectively reach target cells like fibroblasts and keratinocytes, a fluid medium is required. A dry wound bed halts this molecular communication. The referenced research on advanced therapies, such as platelet-rich plasma (PRP) and recombinant growth factors, aims to supplement these very signals in wounds that are stalled, often because the local environment is not conducive to healing . The foundational principle that makes these advanced therapies work is the presence of a receptive, moist wound bed. The evolution of pressure injury dressings has been a journey from passive coverage to creating an active, moisture-balanced microenvironment that protects the newly formed granulation tissue, which is the primary goal during the proliferative phase .