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Vacuum-assisted closure (VAC Therapy) uses 2 distinct types of foams, with different physical characteristics: the black polyurethane (PU) foam and the white polyvinyl alcohol (PVA) foam. This prospective, randomized study evaluates the response of cutaneous blood flow (CBF) in healthy intact forearm skin to varying VAC Therapy negative pressures and both foam types. Continuous negative pressure was used in the range of 25–500 mm Hg. Skin blood flow was measured with noninvasive laser Doppler probes incorporated into the foam. Significant increase in CBF was found with both foams up to negative pressure of 300 mm Hg, with over 5-fold increase (mean: 5.57; SD: 3.32) with the PU foam and nearly 3-fold increase (mean: 2.87; SD: 1.29) with the PVA foam. Comparison of blood flow at baseline and at a negative pressure of 300 mm Hg showed a statistically significant difference (P 0.001). No decrease …