The Use of Epinephrine Infusion for Prophylaxis Against Maternal Hypotension During Cesarean Delivery: a Randomized Controlled Dose-finding Trial
试验速览
- 阶段
- 4 期
- 状态
- 终止
- 发起方
- 入组人数
- 18
- 试验地点
- 1
- 主要终点
- the incidence of post-spinal hypotension
研究概览
简要总结
Maternal hypotension after spinal block is a common complication after subarachnoid block in this population. The incidence of maternal hypotension is nearly 60% when prophylactic vasopressors are not used. Therefore, it is highly recommended to use vasopressors, preferably as continuous infusion, for prophylaxis rather than delaying their use until hypotension occurs.
Phenylephrine (PE) is the recommended drug for prophylaxis against hypotension during cesarean delivery; however, the use of PE is commonly associated with decreased heart rate and probably cardiac output because PE is a pure alpha adrenoreceptor agonist . Introduction of NE in obstetric practice had shown favorable maternal and neonatal outcomes and was associated with higher heart rate and cardiac output compared to PE. However, there is still some mothers who develop bradycardia and diminished cardiac output with the use of NE. The most desired scenario during hemodynamic management of mothers during cesarean delivery would achieve the least possible incidences of maternal hypotension, bradycardia and reactive hypertension. Therefore, it is warranted to reach a vasopressor regimen with the most stable hemodynamic profile.
In the last year, epinephrine was reported for the first time in obstetric practice with acceptable safety on the mother and the fetus. However, there is still lack of data about the most appropriate dose for infusion during cesarean delivery. In this study, we aim to compare three prophylactic infusion rates for epinephrine during cesarean delivery.
详细描述
Upon arrival to the operating room, the patient will be in supine position with left uterine displacement using a wedge below the right buttock. Routine monitoring will be applied (electrocardiography, pulse oximetry, and non-invasive blood pressure monitor). An 18G-cannula will be inserted, and the patients will receive 10 mg metoclopramide, and 50 mg ranitidine. Baseline heart rate and systolic blood pressure will be recorded as the average of three consecutive readings with 2-minutes interval.
Lactated Ringer's solution will be infused at rate of 15 mL/Kg over 10 minutes as a co-load; spinal anesthesia will be achieved by injecting 10 mg of hyperbaric bupivacaine and 20 mcg fentanyl into the subarachnoid space at L3-L4 or L4-L5 interspace using 25G spinal needle.
After subarachnoid block, mothers will be placed in supine position with left-lateral tilt and the vasopressor infusion will be started.
To maintain the double-blind scheme, the total dosage of epinephrine (mcg) for patients in each group will be calculated and added to the 50 ml syringe and will be infused at rate of 50 mL/hour. The calculated epinephrine dose will be withdrawn using insulin syringe. The vasopressor infusion will be through the same line as the intravenous fluids using a three-way stopcock. the infusion will be stopped when there is tachycardia (>130% of baseline value) and/or reactive hypertension (systolic blood pressure > 120% of baseline), otherwise the infusion will be stopped 5-mins after the baby delivery.
Block success will be assessed after 5 minutes from intrathecal injection of local anesthetic; and will be confirmed if sensory block level is at T4.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 40 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 否
入选标准
- •full-term singleton pregnant women
- •American society of anesthesiologist I or II,
- •scheduled for elective cesarean delivery
排除标准
- •Patients with uncontrolled cardiac morbidities (patients with tight valvular lesion, impaired contractility with ejection fraction < 50%, heart block, and arrhythmias),
- •hypertensive disorders of pregnancy,
- •peripartum bleeding,
- •coagulation disorders (patients with INR >1.4 and or platelet count < 80000 /dL)
- •any contraindication to regional anesthesia,
- •baseline systolic blood pressure (SBP) < 100 mmHg will be excluded from the study
研究组 & 干预措施
epinephrine 0.03 mcg
干预措施: Epinephrin 0.03 (Drug)
epinephrine 0.05 mcg
干预措施: Epinephrin 0.05 (Drug)
epinephrine 0.07 mcg
干预措施: Epinephrin 0.07 (Drug)
结局指标
主要结局
the incidence of post-spinal hypotension
时间窗: 1 minutes after spinal injection until 5-minutes after the baby delivery
systolic blood pressure less than 80% of baseline value
次要结局
- total ephedrine dose(1 minutes after spinal injection until 5-minutes after the baby delivery)
- the incidence of bradycardia(1 minutes after spinal injection until 5-minutes after the baby delivery)
- the incidence of severe post-spinal hypotension(1 minutes after spinal injection until 5-minutes after the baby delivery)
- the incidence of reactive hypertension(1 minutes after spinal injection until 5-minutes after the baby delivery)
- the incidence of tachycardia(1 minutes after spinal injection until 5-minutes after the baby delivery)
- number of physician intervention(1 minutes after spinal injection until 5-minutes after the baby delivery)
研究者
Maha Mostafa Ahmad, MD
Principal Investigator
Kasr El Aini Hospital