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Different Approaches to Maternal Hypotension During Cesarean Section

Phase 4
Completed
Conditions
Hypotension
Pregnancy
Cesarean Section
Anesthesia,Spinal
Interventions
Drug: Lactated Ringer's solution
Drug: Ephedrine, continuous infusion
Drug: Ephedrine, bolus
Registration Number
NCT00991627
Lead Sponsor
University of Parma
Brief Summary

The aim of this study is to compare two different therapeutic approaches to blood pressure reduction: pharmacological vs. non-pharmacological. The setting is that of patients undergoing scheduled Cesarean section under spinal anesthesia and suffering from aorta-caval compression syndrome, which causes a sudden drop in blood pressure.

Detailed Description

The supine hypotensive syndrome of pregnancy is induced by compression of the inferior caval vein by the enlarged uterus. It occurs in approximately 8% of pregnant women at term. More patients may develop an asymptomatic variety of this syndrome in the supine position. The hypotensive effect of spinal anesthesia per se may thus be aggravated in a significant number of term parturients. A preoperative supine stress test (SST) before elective cesarean section under spinal anesthesia has been shown to predict severe systolic hypotension with reasonable accuracy.

Different strategies have been proposed for the management of this complication; they can be divided into pharmacological and non-pharmacological ones.

According to pharmacological strategies, vasoactive drugs are used to treat hypotension induced by sympathetic efferent blockade following spinal anesthesia. To this end, α-agonist ephedrine is commonly considered the best choice because of its minimal impact on the fetoplacental circulation. However, excessive use of ephedrine may be detrimental to neonatal well-being because of its vasoconstrictor effect on fetoplacental circulation.

Non-pharmacological treatments may represent a valuable, safer alternative. According to many authors non-pharmacological treatments aimed at removing the cause of aorta-caval compression syndrome are to be preferred because more appropriate from an etiopathogenetic point of view. The use of a wedge-shaped cushion placed under the right hip is a well-known non-pharmacological strategy which allows the uterine left lateral displacement and, consequently, the removing of the compression from the inferior vena cava.

The aim of the present study is to compare, through the evaluation of neonatal well-being, the efficacy of these approaches to hypotension after spinal anesthesia for elective Caesarean section in parturients affected by aorto-caval compression.

Recruitment & Eligibility

Status
COMPLETED
Sex
Female
Target Recruitment
36
Inclusion Criteria
  • Patients undergoing spinal anesthesia for elective Cesarean section
  • Patients in ASA Physical Status Class I or II
  • Informed written consent to participation
  • Positive Supine Stress Test
Exclusion Criteria
  • Any known fetal pathology
  • Indication to general anesthesia
  • Known allergy to any of the study drugs

Study & Design

Study Type
INTERVENTIONAL
Study Design
PARALLEL
Arm && Interventions
GroupInterventionDescription
PharmacologicalBupivacainePatients in this group will receive a basal infusion of ephedrine. Hypotension will be treated for a reduction in systolic blood pressure 20% below baseline values.
PharmacologicalMorphinePatients in this group will receive a basal infusion of ephedrine. Hypotension will be treated for a reduction in systolic blood pressure 20% below baseline values.
PharmacologicalLactated Ringer's solutionPatients in this group will receive a basal infusion of ephedrine. Hypotension will be treated for a reduction in systolic blood pressure 20% below baseline values.
PharmacologicalEphedrine, continuous infusionPatients in this group will receive a basal infusion of ephedrine. Hypotension will be treated for a reduction in systolic blood pressure 20% below baseline values.
PharmacologicalEphedrine, bolusPatients in this group will receive a basal infusion of ephedrine. Hypotension will be treated for a reduction in systolic blood pressure 20% below baseline values.
PharmacologicalAtropinePatients in this group will receive a basal infusion of ephedrine. Hypotension will be treated for a reduction in systolic blood pressure 20% below baseline values.
Non-PharmacologicalBupivacainePatients in this group will undergo uterine lateral displacement through the use of a wedge-shaped cushion placed under their right hip. Hypotension will be treated for a reduction in systolic blood pressure 40% below baseline values.
Non-PharmacologicalLactated Ringer's solutionPatients in this group will undergo uterine lateral displacement through the use of a wedge-shaped cushion placed under their right hip. Hypotension will be treated for a reduction in systolic blood pressure 40% below baseline values.
Non-PharmacologicalEphedrine, bolusPatients in this group will undergo uterine lateral displacement through the use of a wedge-shaped cushion placed under their right hip. Hypotension will be treated for a reduction in systolic blood pressure 40% below baseline values.
Non-PharmacologicalMorphinePatients in this group will undergo uterine lateral displacement through the use of a wedge-shaped cushion placed under their right hip. Hypotension will be treated for a reduction in systolic blood pressure 40% below baseline values.
Non-PharmacologicalAtropinePatients in this group will undergo uterine lateral displacement through the use of a wedge-shaped cushion placed under their right hip. Hypotension will be treated for a reduction in systolic blood pressure 40% below baseline values.
Primary Outcome Measures
NameTimeMethod
Neonatal arterial base excess<5 min from birth
Secondary Outcome Measures
NameTimeMethod
Time between induction of anesthesia and skin incision
Time between skin incision and delivery
Neonatal arterial and venous pH, venous base excess<5 min from birth
Apgar score1 and 5 minutes from birth
Maternal serum levels of cardiac troponin (baseline, immediate postsurgery, 6 and 12 hours after surgery)Baseline and up to 12 h postoperatively
Incidence of maternal hypotension ( <20% baseline or mean arterial pressure <60 mmHg).q5min from anesthesia to end of surgery
Incidence of maternal bradycardia (heart rate <30% of baseline or <60 beats per minute)q5min from anesthesia to end of surgery
Peripheral arterial oxygen saturation: incidence of desaturation (SpO2 <92%) and mean values for each arm.q5min from anesthesia to end of surgery
Administered atropinefrom anesthesia to end of surgery
Amount of ephedrine administered (mg)from anesthesia to end of surgery

Trial Locations

Locations (1)

University and Hospital of Parma (Azienda Ospedaliero-Universitaria di Parma)

🇮🇹

Parma, PR, Italy

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