None listed
Conditions
Interventions
Sponsors
Eligibility
Inclusion criteria
Inclusion criteria: 1. Patients undergoing elective lower extremity surgery under spinal anesthesia; 2, ASA classification I -III.
Exclusion criteria
Exclusion criteria: 1. Severe cardiopulmonary insufficiency; 2. Those who are allergic to local anesthesia drugs and ultrasonic coupling agents; 3. Patients with abnormal mental state who cannot cooperate; 4. The patient refuses to participate in the study.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| maximal sensory block level; | — |
Countries
China
Contacts
The First Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine