supine hypotension syndrome
Conditions
Interventions
Sponsors
Eligibility
Inclusion criteria
Inclusion criteria: 1. Age 18-40 years old; 2. Grade I to II by the American Society of Anesthesiologists (ASA); 3. 37 ~ 42 weeks of pregnancy; 4. Single pregnancy.
Exclusion criteria
Exclusion criteria: 1. American Society of Anesthesiologists (ASA) grade III to IV; 2. Morbid obesity, BMI>40 kg/m^2; 3. non-sinus rhythm; 4. Placenta previa, placental abruption, multiple pregnancy; 5. Preeclampsia or gestational hypertension, basal systolic blood pressure >140 mmHg or < 90 mmHg; 6. History of cardiovascular and cerebrovascular diseases; 7. Abnormal platelet, coagulation, liver and kidney function; 8. Emergency surgery; 9. There are neurological and mental diseases that do not cooperate and cannot communicate.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| carotid artery corrected flow time;respirophasic variation in carotid artery blood flow peak velocity;subclavian vein collapsibility index;maximum diameter of subclavian vein;minimum diameter of subclavian vein; | — |
Countries
China
Contacts
Wuhu maternal and child Health care Hospital