Figure 2From: Bilateral transversus abdominis plane (TAP) block with 24 hours ropivacaine infusion via TAP catheters: A randomized trial in healthy volunteers Heat pain detection threshold (HPDT). HPDT represents the lowest temperature that is perceived as painful. Measurements were conducted on abdominal skin bilaterally before block performance and 1, 4, 8, 12 and 24 hours after block performance.Back to article page