Comparison of Ultrasound-Guided Continuous Erector Spinae Plane Block Versus Thoracic Epidural Analgesia

The random sequence will be sealed in consecutively numbered opaque envelopes and kept by the study coordinator. Participants will be randomly divided into two groups according to the 1:1 ratio of ESPB group and TEB group. A research coordinator is designated to distribute and preserve randomization result. The coordinator will open the envelopes for allocation according to the order of enrolment and prepare the study drug. The participants will be blinded to the allocation. Because the needle injection of ESPB and TEB are very close, participants themselves could hardly detect the clinical differences. Anaesthesiologists who perform the nerve block and take charge of intraoperative management and surgeons are independent individuals. Only the random sequence number rather than the specific nerve block type will be recorded in the electronic anaesthesia information management system .Researchers who do not take part in the nerve block and intraoperative management are designated to postoperative follow-up. Besides, trained anaesthesiologist who do not perform the block will be designated to evaluate the clinical features of the block objectively