Negative-pressure setting
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With negative-pressure wound therapy, −125 mmHg means pressure 125 mmHg below atmospheric pressure.
This is a common setting for a foam-based system. In Pitt and Stanley’s clinical series of 45 dogs, foam-based NPWT used −125 mmHg. Gauze-based systems used a different pressure. The pressure setting belongs with the dressing system and wound being treated.
References
My surgical study notes; Veterinary Surgery: Small Animal, Johnston & Tobias, 2nd edition, 2018, chapter 76. Pitt KA, Stanley BJ. Negative Pressure Wound Therapy: Experience in 45 Dogs. Veterinary Surgery. 2014;43:380–387. doi:10.1111/j.1532-950X.2014.12155.x.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5026415/