A total of 100 patients who were admitted to Qinhuangdao First Hospital for and divided into control group (group C ), thoracic paravertebral nerve block combined with general anesthesia group (group T).~Group C received general anesthesia, and group T received 0.375% ropivacaine 20 ml of thoracic paravertebral nerve block combined with general anesthesia after induction of anesthesia. SBP（Systolic Blood Pressure）/DP （Diastolic Pressure）and HR（Heart Rate） of the two groups were recorded before anesthesia induction (T1), at the time of intubation (T2), at the beginning of surgery (T5), immediately after surgery (T6), and five minutes after extubation (T7) . rScO2（Regional cerebral oxygen saturation） was recorded in both groups at (T1), five minutes after induction(T3), five minutes after single lung ventilation on lateral recumbent(T4), (T6), (T7). The incidence of acute and chronic pain after surgery was compared between the two groups by VAS（Visual analogue scale）after extubation , one day after surgery, and three months after surgery.~The cognitive function of the two groups was assessed with the Mini Mental State Scale (MMSE) and the Montreal Cognitive Assessment Scale (MoCA-Beijing) on the day before , one day after and three months after surgery, comparing the incidence of POD (postoperative cognitive dysfunction) between the two groups.Analyze whether paravertebral block can reduce the incidence of POD by improving brain oxygen saturation.
To investigate the effect of ultrasound-guided thoracic paravertebral nerve block on postoperative acute and chronic pain and cognitive function in elderly patients with thoracoscopic partial lung resection.