Laparoscopic Surgery
Conditions
Interventions
Sponsors
Eligibility
Inclusion criteria
Inclusion criteria: 1. Patients who undergo elective gastrointestinal surgery laparoscopy; 2. ASA grade I-II grade; 3. Aged > 18 years.
Exclusion criteria
Exclusion criteria: 1. Patients with severe heart, brain, liver, lung, kidney and other pathological changes and blood system abnormalities; 2. Pregnant or lactating women; 3. Patients with arrhythmia, valvular heart disease, ischemic heart disease or left ventricular ejection fraction < 40%; 4. Patients with new arrhythmias, arterial intubation failure, or unexpected severe hemodynamic changes during the operation after induction of anesthesia; 5. The operation time is less than 2h; 6. Patients who refuse to sign informed consent.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| SVV; | — |
Countries
China
Contacts
The First Affiliated Hospital of Zhengzhou University