Application of Combined Lumbar Plexus and Sciatic Nerve Block

Application of Combined Lumbar Plexus and Sciatic Nerve Block in Unilateral Knee Replacement

The research is to study the effectiveness and safety of combined lumbar plexus and sciatic nerve block by the guide of peripheral nerve stimulator (PNS) in unilateral knee replacement.There have be some papers which supported that combined lumbar plexus and sciatic nerve block may be more suitable for the old men.

Inclusion Criteria:

1. Patients of American Association of anesthetists（ASA）Grade 1、2 or 3
2. Aged between 18 and 85 years
3. Undergoing elective total knee replacement.

Exclusion Criteria:

1. Mental illness can not match
2. Nerve block, epidural anesthesia contraindicated
3. People who have Slow-type arrhythmias
4. History of chronic headaches and long-term use of analgesic drugs
5. People who were postoperative consciousness, language or hearing impaired