Objective To evaluate the effect of different approaches to thoracolumbar interfascial plane (TLIP) block on the analgesic efficacy after lumbar spinal fusion.Methods Seventy-five patients of both sexes,of American Society of Anesthesiologists physical status Ⅰ or Ⅱ,aged 40-70 yr,with body mass index ≤40 kg/m2,undergoing posterior median approach to lumbar spinal fusion,were divided into 3 groups (n =25 each) using a random number table method:patient-controlled intravenous analgesia (PCIA) group (group P),medial approach to TLIP combined with PCIA group (group MP) and lateral approach to TLIP combined with PCIA group (group LP).TLIP block was performed by advancing the block needle in a lateral to medial direction and injecting 0.5％ ropivacaine 20 ml locally between the bilateral multifidus and longissimus muscles in group MP.TLIP block was performed by advancing the block needle in a medial to lateral direction and injecting 0.5％ ropivacaine 20 ml locally between the bilateral longissimus and iliocostalis muscles in group LP.The identification rate and distinction score between multifidus and iliocostalis muscles obtained from ultrasonic images were recorded before block in MP and LP groups.All the patients received PCIA until 48 h after surgery.PCIA solution contained sufentanil 100 μg and tropisetron 10 mg diluted to 100 ml with 0.9％ normal saline.The PCA pump was set up with a 2 ml bolus dose,a 15-min lockout interval and background infusion at a rate of 1 ml/h.When visual analogue scale score at rest ＞4 after surgery,parecoxib 40 mg was intravenously injected for rescue analgesia.The development of adverse reactions such as nausea and vomiting was recorded within 48 h after surgery.Results The identification rate and distinction score of the iliocostalis was significantly higher than that of the multifidus (P＜0.05).Compared with group P,the intraoperative consumption of propofol and remifentanil was significantly decreased,the pressing times of PCA,amount of drugs consumed in PCA and consumption of parecoxib were decreased within 48 h after surgery (P＜0.05),and no significant change was found in the incidence of nausea or vomiting in MP and LP groups (P＞0.05).There was no significant difference in the parameters mentioned above between group MP and group LP (P＞0.05).Conclusion Ultrasound-guided medial and lateral approaches to TLIP block is helpful in achieving low-dose opioid anesthesia mode and more helpful in enhancing the efficacy of PCIA when used for lumbar spinal fusion.

Objective:To investigate the effect of ultrasound-guided thoracic paravertebral nerve block (TPNB) on anesthesia efficacy and stress response in middle-aged and elderly patients undergoing radical surgery for lung cancer.Methods:A total of 104 lung cancer patients who underwent thoracoscopic radical resection for lung cancer at Qingdao Traditional Chinese Medicine Hospital from November 2020 to May 2023 were selected and randomly divided into an observation group (52 cases) and a control group (52 cases) using a random number table method. The observation group received general anesthesia combined with ultrasound-guided TPNB anesthesia during surgery, while the control group received general anesthesia. Two groups of patients were compared in terms of surgical time, intraoperative blood loss, remifentanil and propofol dosage, fluctuation trends of mean arterial pressure (MAP) and heart rate (HR), pain levels in resting and coughing states after surgery, differences in serum stress response indicators [fasting plasma glucose (FPG), cortisol (Cor), norepinephrine (NE), epinephrine (E)] before and after surgery, and adverse reactions.Results:There was no statistically significant difference in surgical time, intraoperative blood loss, and single lung ventilation time between the observation group and the control group (all P>0.05). The usage of remifentanil and propofol in the observation group was lower than that in the control group, and the difference was statistically significant (all P<0.05). The MAP fluctuation changes at four time points before anesthesia induction, 30 minutes during surgery, 90 minutes during surgery, and after surgery in the observation group were smaller than those in the control group. Among them, the MAP at 30 minutes during surgery and 90 minutes during surgery was higher than that in the control group (all P<0.05); There was no statistically significant difference in HR fluctuations between the observation group and the control group at the four time points (all P>0.05). The Visual Analog Scale (VAS) scores of the observation group patients in resting and coughing states at 12 and 24 hours after surgery were lower than those of the control group at the same time point (all P<0.05). The serum Cor and E levels in the observation group were lower than those in the control group at 12 hours after surgery, and the serum NE levels were lower than those in the control group at 12 and 24 hours after surgery (all P<0.05). The incidence of adverse reactions caused by anesthesia in the observation group was lower than that in the control group ( P<0.05). Conclusions:The use of ultrasound-guided TPNB combined with general anesthesia in patients undergoing radical surgery for lung cancer is beneficial in reducing intraoperative blood pressure fluctuations, alleviating postoperative pain and stress response, and reducing adverse reactions caused by anesthesia.