Different Crystalloid Coload Volumes on the 90% ED of Norepinephrine
Study Details
Study Description
Brief Summary
The purpose of this study is to investigate the effect of different crystalloid coload volumes on the 90% effective dose of prophylactic norepinephrine infusions for preventing postspinal anesthesia hypotension during cesarean section.
Condition or Disease | Intervention/Treatment | Phase |
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N/A |
Detailed Description
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. Coload has been highly demonstrated for prevention and/or treatment of post-spinal anesthesia hypotension. In addition, there's some evidence that prophylactic infusion of norepinephrine could effectively reduce the incidence of post-spinal anesthesia hypotension in parturients undergoing cesarean section. The purpose of this study is to investigate the effect of different crystalloid coload volumes on the 90% effective dose of norepinephrine infusion prophylaxis for hypotension during spinal anesthesia for cesarean section.
Study Design
Arms and Interventions
Arm | Intervention/Treatment |
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Experimental: Control group No fluid coload was given. An initial infusion dose of prophylactic norepinephrine simultaneous with spinal anesthesia |
Drug: Crystalloid - 0 ml/kg
No fluid coload was given. An initial infusion dose of prophylactic norepinephrine (0.025 ug/kg/min) simultaneous with spinal anesthesia. The dose administered to subsequent patients varied by increments or decrements of 0.005 ug/kg/min of prophylactic norepinephrine according to the responses of previous patients according to the up-down sequential allocation.
Other Names:
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Experimental: Crystalloid - 5 ml/kg 5 ml/kg crystalloid coload combined with an initial infusion dose of prophylactic norepinephrine simultaneous with spinal anesthesia. |
Drug: Crystalloid - 5 ml/kg
5 ml/kg crystalloid coload combined with an initial infusion dose of prophylactic norepinephrine (0.025 ug/kg/min) simultaneous with spinal anesthesia. The dose administered to subsequent patients varied by increments or decrements of 0.005 ug/kg/min of prophylactic norepinephrine according to the responses of previous patients according to the up-down sequential allocation.
Other Names:
|
Experimental: Crystalloid - 10 ml/kg 10 ml/kg crystalloid coload combined with an initial infusion dose of prophylactic norepinephrine simultaneous with spinal anesthesia. |
Drug: Crystalloid - 10 ml/kg
10 ml/kg crystalloid coload combined with an initial infusion dose of prophylactic norepinephrine (0.025 ug/kg/min) simultaneous with spinal anesthesia. The dose administered to subsequent patients varied by increments or decrements of 0.005 ug/kg/min of prophylactic norepinephrine according to the responses of previous patients according to the up-down sequential allocation.
Other Names:
|
Outcome Measures
Primary Outcome Measures
- ED50 and ED90 [1-15 minutes after spinal anesthesia]
The dose of prophylactic norepinephrine that would be effective in preventing postspinal anesthesia hypotension in 50% (effective dose, ED 50) and 90% (ED90) of patients
Secondary Outcome Measures
- The incidence of post-spinal anesthesia hypotension [1-15 minutes after spinal anesthesia]
Systolic blood pressure (SBP) < 80% of the baseline
- The incidence of severe post-spinal anesthesia hypotension [1-15 minutes after spinal anesthesia]
Systolic blood pressure (SBP) < 60% of the baseline
- The incidence of bradycardia [1-15 minutes after spinal anesthesia]
Heart rate < 60 beats/min
- The incidence of nausea and vomiting [1-15 minutes after spinal anesthesia]
Presence of nausea and vomiting in patients after spinal anesthesia
- The incidence of hypertension [1-15 minutes after spinal anesthesia]
Systolic blood pressure (SBP) >120% of the baseline
- pH [Immediately after delivery]
From umbilical arterial blood gases
- Partial pressure of oxygen (PO2) [Immediately after delivery]
From umbilical arterial blood gases
- Base excess (BE) [Immediately after delivery]
From umbilical arterial blood gases
- APGAR score [1 minute after delivery]
A= Appearance P=Pulse G=Grimace A=Attitude R=Respiration
- APGAR score [5 minute after delivery]
A= Appearance P=Pulse G=Grimace A=Attitude R=Respiration
Eligibility Criteria
Criteria
Inclusion Criteria:
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18-45 years
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Primipara or multipara
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Singleton pregnancy ≥37 weeks
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American Society of Anesthesiologists physical status classification I to II
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Scheduled for cesarean section under spinal anesthesia
Exclusion Criteria:
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Body height < 150 cm
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Body weight > 100 kg or body mass index (BMI) ≥ 40 kg/m2
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Eclampsia or chronic hypertension or baseline blood pressure ≥180 mmHg
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Hemoglobin < 7g/dl
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Fetal distress, or known fetal developmental anomaly
Contacts and Locations
Locations
No locations specified.Sponsors and Collaborators
- General Hospital of Ningxia Medical University
Investigators
- Study Chair: Yi Chen, M.D., General Hospital of Ningxia Medical University
- Study Chair: Xiangsheng Xiong, M.D., The Fifth People's Hospital of Huaian
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- Yi Chen-2023-2