Which action supports proper technique when applying negative-pressure wound therapy near a knee wound?

• A. Drying the periwound thoroughly before dressing
• B. Covering the skin near the suction line with a hydrocolloid
• C. Applying adhesive remover at the affected site before the dressing
• D. Dressing the wound with a hydrocolloid film 3 cm away from the wound

Answer: (A)

Maintaining a dry periwound skin is essential because negative-pressure wound therapy relies on a tight, airtight seal to sustain effective suction. When the knee area has moisture or sweat, folds, or movement, the dressing can lose its seal, leading to leaks and reduced therapeutic effect. Drying the periwound before applying the dressing helps the adhesive adhere firmly and maintain the seal around the wound, even with knee bending.

The other actions don’t support that critical seal as directly. Using hydrocolloid near the suction line can trap moisture or interfere with adhesion, compromising the seal. Applying adhesive remover at the site can irritate skin and weaken dressing adhesion. Placing hydrocolloid film 3 cm away from the wound won’t help form a proper seal and may leave gaps.