90% Effective Dose of Phenylephrine Infusions for Preventing Postspinal Anesthesia Hypotension Under Intensive and Standard Treatment During Cesarean Section
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 发起方
- 入组人数
- 80
- 主要终点
- ED50 and ED90
研究概览
简要总结
The objective of this study is to investigate the 90% effective dose of phenylephrine infusions for preventing postspinal anesthesia hypotension under intensive and standard treatment during cesarean section
详细描述
Post-spinal anesthesia hypotension is a frequent complication during spinal anesthesia for cesarean section. The incidence of post-spinal anesthesia hypotension is as high as 62.1-89.7% if prophylactic measures are not taken. The 2016 ASA guidelines for obstetric anesthesia suggest avoiding hypotension following spinal anesthesia in women and emphasize the use of vasopressors, specifically alpha-receptor agonists, as the preferred strategy to prevent and manage post-spinal anesthesia hypotension. The 2018 International Consensus in the United Kingdom and Northern Ireland recommends maintaining maternal systolic blood pressure above 90% of the baseline value following lumbar anesthesia, while avoiding dropping below 80% of the baseline value. Currently, the threshold for maintaining blood pressure above 80% of the baseline value is widely adopted as a standard; however, limited evidence supports the advantage of sustaining maternal blood pressure above 90% of the baseline value. The objective of this study is to investigate the 90% effective dose of phenylephrine infusions for preventing postspinal anesthesia hypotension under intensive and standard treatment during cesarean section.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Double (Participant, Care Provider)
入排标准
- 年龄范围
- 18 Years 至 45 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •18-45 years
- •Primipara or multipara
- •Singleton pregnancy ≥37 weeks
- •American Society of Anesthesiologists physical status classification I to II
- •Scheduled for cesarean section under spinal anesthesia
排除标准
- •Body height < 150 cm
- •Body weight > 100 kg or body mass index (BMI) ≥ 40 kg/m2
- •Eclampsia or chronic hypertension or baseline blood pressure ≥180 mmHg
- •Hemoglobin < 7g/dl
研究组 & 干预措施
Standard group
The maternal systolic blood pressure was consistently maintained above 80% of the preoperative baseline value from the initiation of spinal anesthesia until fetal delivery.
干预措施: Alpha-Agonist (Drug)
Intensive group
The maternal systolic blood pressure was consistently maintained above 90% of the preoperative baseline value from the initiation of spinal anesthesia until fetal delivery.
干预措施: α-adrenergic receptor agonist (Drug)
结局指标
主要结局
ED50 and ED90
时间窗: 1-15 minutes after spinal anesthesia
The dose of prophylactic phenylephrine that would be effective in preventing postspinal anesthesia hypotension in 50% (effective dose, ED 50) and 90% (ED90) of patients
次要结局
- The incidence of severe post-spinal anesthesia hypotension.(1-15 minutes after spinal anesthesia.)
- The incidence of bradycardia.(1-15 minutes after spinal anesthesia.)
- The incidence of nausea and vomiting.(1-15 minutes after spinal anesthesia.)
- Base excess(Immediately after delivery)
- Partial pressure of oxygen (PO2)(Immediately after delivery)
- pH(Immediately after delivery)
- The incidence of post-spinal anesthesia hypotension(1-15 minutes after spinal anesthesia.)
- APGAR score(5 min after delivery)
- The incidence of hypertension.(1-15 minutes after spinal anesthesia.)