Development of a Risk Prediction Model for Post-Spinal Anesthesia Hypotension During Cesarean Delivery Using Heart Rate, Blood Pressure, Perfusion Index, ECG Waveforms, and SpO₂ Waveforms
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Standard clinical spinal anesthesia and routine intraoperative monitoring.
- Who it may be relevant to
- Registry conditions: Cesarean Section. Basic parameters: 18 years — 50 years · Female.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- China
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Overview
Spinal anesthesia is the preferred anesthetic technique for patients undergoing cesarean section. Compared with general anesthesia, spinal anesthesia offers multiple advantages. However, a common adverse effect of this technique is hypotension following spinal anesthesia, which is induced by sympathetic blockade and has an incidence rate as high as 70%. Hypotension can lead to maternal nausea and vomiting, reduced fetal Apgar scores, and acidosis, exerting adverse effects on both the mother and the fetus. Furthermore, prolonged duration of hypotension may adversely impact the fetal neurological prognosis. Therefore, predicting which patients are at high risk for developing hypotension facilitates the implementation of preventive measures-such as the administration of vasoactive agents and intensified monitoring through frequent blood pressure measurements-to improve clinical outcomes in these high-risk patients. Patients undergoing cesarean section who met the inclusion criteria were prospectively observed. A standardized anesthesia protocol was uniformly applied to investigate the incidence of hypotension following spinal anesthesia. Based on dynamic changes in preoperative and intraoperative heart rate, blood pressure, perfusion index, and waveform characteristics of electrocardiography and pulse oximetry, a prognostic model was developed to predict the occurrence of hypotension after spinal anesthesia.
Interventions
- Procedure Standard clinical spinal anesthesia and routine intraoperative monitoring
All participants receive routine clinical spinal anesthesia, standard surgical operation and conventional vital sign monitoring without additional experimental intervention. No new drugs, devices or invasive operations are applied in this study.
Primary outcome measures
- Incidence of hypotension [Time frame: from spinal anesthesia induction to fetal delivery]
Eligibility criteria
Inclusion criteria
- Singleton pregnant women aged ≥18 years with gestational age ≥37 weeks, scheduled for cesarean section.
- Informed consent was obtained from all participants.
Exclusion criteria
- Emergency cesarean sections or cases requiring general anesthesia.
- Maternal age < 18 years.
- Major obstetric complications (e.g., placenta previa, gestational hypertension, preeclampsia) or significant cardiovascular/cerebrovascular diseases.
- Body Mass Index (BMI) ≥ 36 kg/m².
- Gestational age < 36 weeks or > 41 weeks.
- Contraindications to neuraxial anesthesia.
- Refusal to participate.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
China · 1 center
- Peking University Shenzhen Hospital — Shenzhen
Identifiers
NCT: NCT07689825 · 2026-158