Figure 4.

The amount of granulation tissue after dressing application without negative pressure (no negative pressure wound therapy [NPWT]), continuous NPWT, intermittent pressure therapy (IPT), or variable pressure therapy (VPT), using either gauze or foam. The amount of granulation tissue was graded on a scale from 0 to 5 by 2 different surgeons. Results are shown as means ± SEM of 8 experiments. Note that similar amounts of granulation tissue are formed under gauze during IPT or VPT as under foam with continuous NPWT.