ESP Versus PIFB for Analgesia in Open Cardiac Surgery: a Randomized Control Trial

Bilateral ESP: 0.5% ropivacaine 0.3 ml per kg (ideal body weight) each side, 30 min before skin excision. After surgery, use pump to deliver an intermittent automatic bolus of 0.3 ml per kg 0.16% ropivacaine every 4 hours each side.

Bilateral PIFB: 0.5% ropivacaine 0.3 ml per kg (ideal body weight) each side, 30 min before skin excision. After surgery, use pump to deliver an intermittent automatic bolus of 0.3 ml per kg 0.16% ropivacaine every 4 hours each side.