Fig. 4From: Effects of ultrasound-guided paravertebral block on MMP-9 and postoperative pain in patients undergoing VATS lobectomy: a randomized, controlled clinical trialPlasma concentration of measured MMP-9 in lung cancer patients receiving PVB combined general anesthesia or only general anesthesia. *P < 0.05 in the PVB group compared with GA group. MMP-9 = matrix metalloproteinase-9; PVB = paravertebral block; GA = general anesthesiaBack to article page