Clinical trial NCT06158048: ED90 of Norepinephrine and Phenylephrine Infusions Under Intensive Treatment
Official title: ED90 of Norepinephrine and Phenylephrine Infusions for Preventing Postspinal Anesthesia Hypotension Under Intensive Treatment During Cesarean Section
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Adverse Effect
Lead sponsor: General Hospital of Ningxia Medical University
Sponsor class: OTHER
First posted: 2023-12-06
Enrollment: 60
Sex: FEMALE
Minimum age (years): 18
Maximum age (years): 45
Standard ages: ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: The objective of this study is to investigate the ED90 of norepinephrine and phenylephrine infusions for preventing postspinal anesthesia hypotension under intensive treatment during cesarean section

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. 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 ED90 of norepinephrine and phenylephrine infusions for preventing postspinal anesthesia hypotension under intensive treatment during cesarean section

Eligibility criteria: Inclusion Criteria:

* 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

Exclusion Criteria:

* 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
* Fetal distress, or known fetal developmental anomaly

Primary outcomes:
measure: ED50 and ED90
timeFrame: 1-15 minutes after spinal anesthesia
Secondary outcomes:
measure: The incidence of post-spinal anesthesia hypotension
timeFrame: 1-15 minutes after spinal anesthesia
Other outcomes:
measure: The incidence of severe post-spinal anesthesia hypotension.
timeFrame: 1-15 minutes after spinal anesthesia
measure: The incidence of bradycardia.
timeFrame: 1-15 minutes after spinal anesthesia
measure: The incidence of nausea and vomiting.
timeFrame: 1-15 minutes after spinal anesthesia
measure: The incidence of hypertension.
timeFrame: 1-15 minutes after spinal anesthesia
measure: pH
timeFrame: Immediately after delivery
measure: Base excess
timeFrame: Immediately after delivery
measure: Partial pressure of oxygen (PO2)
timeFrame: Immediately after delivery
measure: APGAR score
timeFrame: 1 min after delivery
measure: APGAR score
timeFrame: 5 min after delivery
Locations:
city: Yinchuan
country: China
facility: General Hospital of Ningxia Medical University
state: Ningxia
Study officials:
affiliation: General Hospital of Ningxia Medical University
name: Yi Chen, M.D.
role: STUDY_CHAIR
References: