Question

What is the negative pressure in VAC dressing?

• A. 60-90 mmHg
• B. 90-100 mmHg
• C. 120-130 mmHg
• D. 130-150 mmHg

Hint:

The optimal range for negative pressure in VAC dressing is 120-130 mmHg to effectively promote wound healing and tissue regeneration.

Answer 1

The Correct Option is C

Step 1: Recall what VAC therapy does.
Vacuum-Assisted Closure (VAC), also called Negative Pressure Wound Therapy (NPWT), applies controlled sub-atmospheric suction to a sealed foam dressing over a wound. The suction removes excess interstitial fluid and exudate, reduces oedema, draws the wound edges inward, improves local perfusion and stimulates granulation tissue.

Step 2: Recall the standard pressure setting.
The conventionally taught therapeutic negative pressure for continuous NPWT is around $125$ mmHg below atmospheric. Among the choices, the band that contains this value is $120-130$ mmHg.

Step 3: Reject the other ranges.
• $60-90$ mmHg and $90-100$ mmHg are below the standard effective setting (such low pressures are reserved for special situations, not the default).
• $130-150$ mmHg overshoots the usual prescribed level.
Only the $120-130$ mmHg band brackets the standard $125$ mmHg.

Step 4: Conclusion.
The routine negative pressure used in VAC dressing centres on $125$ mmHg, i.e. the $120-130$ mmHg range.

Final answer: Option 3 - 120-130 mmHg.