Fig. 3From: Effect of low dose naloxone on the immune system function of a patient undergoing video-assisted thoracoscopic resection of lung cancer with sufentanil controlled analgesia — a randomized controlled trialVisual analog scale for pain (a) at rest and (b) while coughing 1, 6, 12, 24, and 48 h after surgery. Data are expressed as means ± SD. Significantly different from the non-naloxone group at *P<0.05Back to article page