Phenylephrine Prophylaxis for Postspinal Anesthesia Hypotension in Parturients With Preeclampsia

Adverse Effect Clinical Trial

Official title:

Phenylephrine Prophylaxis for Postspinal Anesthesia Hypotension in Parturients With Preeclampsia Undergoing Cesarean Section: a Randomized, Placebo-controlled Dose-finding Trial

Clinical Trial Details — Status: Not yet recruiting

Administrative data

• NCT number: NCT04576663
• Other study ID #: Yi Chen-2020-6
• Status: Not yet recruiting
• Phase: N/A
• Start date: October 1, 2023
• Est. completion date: September 21, 2025

Study information

• Verified date: September 2021
• Source: General Hospital of Ningxia Medical University
• Contact: Xinli Ni, Dr.
• Phone: 86-951-674-3252
• Email: xinlini6[@]nyfy.com.cn
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The purpose of this study is to investigate the suitable infusion dose of phenylephrine for prophylaxis against postspinal anesthesia hypotension in parturients with preeclampsia undergoing cesarean section.

Description:

Preeclampsia, which affects 5% to 7% of parturients, is a significant cause of maternal and neonatal morbidity and mortality. Because of constricted myometrial spiral arteries with exaggerated vasomotor responsiveness, though blood pressure in parturients with preeclampsia are apparently higher than healthy parturients, placental hypoperfusion is more common. Spinal anesthesia is still the preferred mode of anesthesia in parturients with preeclampsia for cesarean section. In preeclampsia parturients, spinal anesthesia improve intervillous blood flow (provided that hypotension is avoided) which contribute to increase placental perfusion. Even so, 17-26% parturients with preeclampsia experienced postspinal anesthesia hypotension due to the extensive sympathetic block that occurred with spinal anesthesia. Practical guidelines for obstetric anesthesia from the American Society of Anesthesiologists and an international consensus statement on the management of hypotension with vasopressors indicate either IV ephedrine or phenylephrine may be used to correct hypotension. But the suitable infusion dose of phenylephrine in parturients with preeclampsia is still unknown. The purpose of this study is to investigate the suitable infusion dose of phenylephrine for prophylaxis against post-spinal anesthesia hypotension in parturients with preeclampsia undergoing cesarean section.

Recruitment information / eligibility

• Status: Not yet recruiting
• Enrollment: 95
• Est. completion date: September 21, 2025
• Est. primary completion date: September 21, 2025
• Accepts healthy volunteers: No
• Gender: Female
• Age group: 18 Years to 45 Years

Eligibility

Inclusion Criteria:

• 18-45 years
• Primipara or multipara
• Singleton pregnancy =32 weeks
• American Society of Anesthesiologists physical status classification II to III
• Scheduled for cesarean section under spinal anesthesia

Exclusion Criteria:

• Baseline blood pressure =180 mmHg
• Body height < 150 cm
• Body weight > 100 kg or body mass index (BMI) = 40 kg/m2
• Eclampsia or chronic hypertension
• Hemoglobin < 7g/dl
• Fetal distress, or known fetal developmental anomaly

Related Conditions & MeSH terms

• Adverse Effect
• Hypotension
• Pre-Eclampsia

Intervention

Drug:
• Normal saline
Normal saline infusion simultaneous with subarachnoid block
• Phenylephrine
Different infusion dose of phenylephrine simultaneous with subarachnoid block

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
General Hospital of Ningxia Medical University

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	The incidence of post-spinal anesthesia hypotension	Systolic blood pressure (SBP) < 80% of the baseline	1-15 minutes after spinal anesthesia
Secondary	Overall stability of systolic blood pressure control versus baseline	Evaluated by performance error (PE)	1-15 minutes after spinal anesthesia
Secondary	Overall stability of heart rate control versus baseline	Evaluated by performance error (PE)	1-15 minutes after spinal anesthesia
Secondary	The incidence of severe post-spinal anesthesia hypotension	Systolic blood pressure (SBP) < 60% of the baseline	1-15 minutes after spinal anesthesia
Secondary	The incidence of nausea and vomiting	Presence of nausea and vomiting in patients after spinal anesthesia	1-15 minutes after spinal anesthesia
Secondary	The incidence of bradycardia	Heart rate < 60 beats/min	1-15 minutes after spinal anesthesia
Secondary	The incidence of hypertension.	Systolic blood pressure (SBP) >120% of the baseline.	1-15 minutes after spinal anesthesia
Secondary	pH	From umbilical arterial blood gases.	Immediately after delivery
Secondary	Partial pressure of oxygen	From umbilical arterial blood gases.	Immediately after delivery
Secondary	Base excess	From umbilical arterial blood gases.	Immediately after delivery
Secondary	APGAR score	A= Appearance P=Pulse G=Grimace A=Attitude R=Respiration	1 min after delivery
Secondary	APGAR score	A= Appearance P=Pulse G=Grimace A=Attitude R=Respiration	5 min after delivery