Wound, Ostomy and Continence Nurses Society (WOCN) Practice Exam

Which type of NPWT promotes granulation tissue formation?

1. Continuous vacuum therapy

2. Intermittent vacuum therapy

3. Negative pressure without dressing

4. High-capacity suction therapy

The correct answer is: Intermittent vacuum therapy

Intermittent vacuum therapy is designed to promote granulation tissue formation by cycling the application of suction. This cyclical approach allows for periods of decompression, which can enhance blood flow to the wound area and facilitate nutrient delivery, while also supporting cellular activities essential for healing. The alternating pressure helps to mobilize interstitial fluid, reduce edema, and stimulate cellular responses that contribute to tissue repair. This method encourages the proliferation of fibroblasts and keratinocytes, leading to increased granulation tissue formation, which is a critical aspect of effective wound healing. The granulation tissue provides a foundation for future skin coverage and is essential for closing chronic wounds. Other options may not provide the same benefits. Continuous vacuum therapy maintains a steady pressure that may not facilitate the same level of vascular response as intermittent therapy. Negative pressure without dressing does not create the necessary conditions for effective wound healing, as the dressing plays a crucial role in maintaining the necessary environment. High-capacity suction therapy, while effective at managing larger volumes of exudate, does not necessarily promote granulation tissue in the same way that intermittent vacuum therapy does.