Analgesia methods: For analgesia during debridement, either a topically administered eutectic mixture of 5% lidocaine/prilocaine (EMLA®) or an inhaled premix of 50% nitrous oxide/50% oxygen (Kalinox®) are used. The 5% lidocaine/prilocaine cream is administered as a thick layer directly onto the wound with a scoop and the wound is sealed with a polyurethane foil. After 30 minutes of exposure time, the foil is removed and debridement is started immediately. For analgesia with the inhaled 50% nitrous oxide/50% oxygen premix, the patient is asked to hold an inhalation rebreather mask with on-demand-valve tightly placed onto the face after being instructed on how to inhale the gas premix. After 3 minutes of exposure time to the gas premix, debridement is started immediately. Gas inhalation is sustained until final wound dressing is applied. During the entire procedure with each analgesia method, vital signs such as non-invasive blood pressure, heart rate and peripheral oxygen saturation (SpO2) are be recorded.