Plexaa For Preconditioning: Gender Affirming Mastectomy

Inclusion Criteria: * All transgender or non-binary patients over the age of 18 years (no maximum age limit) * Patients undergoing peri-areolar mastectomy or double incision mastectomy with a free nipple graft for gender affirmation Exclusion Criteria: * Patients undergoing surgery for breast cancer * Delayed (two-stage) breast reconstruction patients * Patients undergoing simple mastectomy or wide local excision of a breast tumour * Presence of open breast skin wounds, or infected or inflamed breast skin * Presence of a cardiac pacemaker, defibrillator or any other implantable electronic device