To compare the clinical and postoperative analgesic effects of hydromorphone combined with ropivacaine and ropivacaine alone in quadrangular muscle block for open inguinal hernia in elderly patients.

Elderly patients selected for Lichtenstein hernia repair in our hospital who met the inclusion and exclusion criteria and obtained informed consent were included in this trial, and were randomly divided into experimental group by random number table method: 0.375% ropivacaine combined with hydromorphone block group, and control group: 0.375% ropivacaine block group alone.

Inclusion Criteria:

• Age 60 and above.
• Admission to hospital for open inguinal hernia surgery is consistent with the -indications of this surgical modality, ASA grades 1 to 3.
• No recent use of sedatives, opioids, or other analgesics.
• Good compliance, signed informed consent.
• Complete clinical data.

Exclusion Criteria:

• There are serious cardiovascular and cerebrovascular diseases.
• Abdominal infection.
• Coagulation dysfunction or receiving anticoagulation therapy.
• Local anesthesia drug allergy.
• Can not cooperate with the corresponding operation, suffering from mental illness.
• Previous surgical history of the corresponding position in the abdomen that may interfere with the surgical process of this study.