Final answer:
A hydrogel dressing is the best option for increasing blood supply to the skin of a stage I pressure ulcer, as it provides moisture and promotes healing.
Step-by-step explanation:
The nurse caring for a client with a stage I pressure ulcer to the sacrum should consider using a hydrogel dressing to help increase blood supply to the skin. Hydrogel dressings are designed to provide a moist environment and adequate hydration to the affected area, which can promote healing and increase blood flow. They are typically used for their cooling, soothing effect on mild pressure ulcers, such as stage I ulcers, and are less invasive compared to other options like vacuum-assisted closure. Other products listed, such as transparent dressings, may not provide the necessary moisture for a stage I ulcer, and Granulex is generally used for debridement in more advanced ulcers. The vacuum-assisted closure is used for more severe wounds that need to have excess fluid removed and is not typically used for stage I ulcers.