JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
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The effect of percutaneous endoscopic lumbar discectomy under different anesthesia on pain and immunity of patients with prolapse of lumbar intervertebral disc.

OBJECTIVE: To explore the effect of percutaneous transforaminal endoscopic discectomy under different anesthesia on pain and immunity of patients with lumbar disc herniation.

PATIENTS AND METHODS: 92 cases of patients with lumbar disc herniation in the Affiliated Hospital of Qingdao University from February 2015 to January 2016 were collected. These patients were randomly divided into control group and observation group (n = 46). Patients in the control group underwent percutaneous transforaminal endoscopic discectomy with the use of local anesthesia, while patients in the observation group used continuous epidural anesthesia. Oswestry Disability Index (ODI) and Visual Analogue Scale of Pain (VAS) were used to compare the surgical effect and the degree of pain of patients in the two groups. Adverse reactions (nausea, vomiting, dizziness, drowsiness) of patients in two groups were compared. T lymphocytes subset level (CD4+, CD8+) and inflammatory cytokines (IL-2, TNF) in the immune system were compared on the 1st, 3rd, and 10th day post-operatively.

RESULTS: The pain degree of patients in the two groups had no significant difference before their operations (p > 0.05). The intraoperative pain rate of patients in the observation group was significantly lower than the control group (p < 0.05). Patients in both groups achieved a remarkable decrease of pain intensity on month 1 and month 3 post-operatively (p < 0.05). There is no significant difference between the two groups (p > 0.05). ODI scores of patients in the two groups had no significant difference pre-operatively (p > 0.05). Patients in both groups achieved a remarkable decrease of ODI scores after surgery (p < 0.05), and there is no significant difference between the two groups (p > 0.05). The occurrence of adverse reactions in the observation group was significantly lower than the control group (p < 0.05). On day 1 and 3 post-operatively, CD4+ and CD8+ levels of patients in both groups were lower than before operation, and data in the control group decreased more than the observation group (p < 0.05). IL-2 and TNF-α levels of patients in the two groups were significantly higher than pre-operatively, and data in the control group was higher than the observation group (p < 0.05). On day 10 post-operatively, all the indexes returned to the preoperative level.

CONCLUSIONS: Both continuous epidural anesthesia and local anesthesia can reduce or avoid perioperative pain, but continuous epidural anesthesia has more advantages than local anesthesia, and it can improve the immune function for patients undergoing PTED for LDH.

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