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A Comparison of Intermittent Intravenous Boluses of Phenylephrine and Norepinephrine to Prevent Spinal-induced Hypotension in Cesarean Deliveries

S

Samuel Lunenfeld Research Institute, Mount Sinai Hospital

Status

Completed

Conditions

Hypotension

Treatments

Drug: Phenylephrine
Drug: Norepinephrine

Study type

Interventional

Funder types

Other

Identifiers

Details and patient eligibility

About

Hypotension is a very common complication of spinal anesthesia for cesarean delivery, and can have unwanted side effects on both mother and fetus if not treated promptly. Phenylephrine has been the drug of choice to treat this spinal-induced hypotension. Although phenylephrine is safe to use for this indication, it has been associated with reflex bradycardia and a reduction in cardiac output.

Norepinephrine is a potent vasopressor used to treat hypotension in the critical care setting. Recent studies have looked at norepinephrine's use in the obstetric setting, and have shown that it can be used safely and also has favourable hemodynamic properties when compared to phenylephrine, with less bradycardia and less depression of cardiac output.

The investigators recently conducted a study to determine the ED90 of norepinephrine, and now plan to compare bolus doses of phenylephrine to norepinephrine for treating hypotension following spinal anesthesia for cesarean section.

The investigators hypothesize that norepinephrine, when given as a bolus to prevent post spinal hypotension, will result in around 70% relative decrease in the rate of bradycardia when compared to phenylephrine in patients undergoing elective cesarean delivery under spinal anesthesia.

Full description

Norepinephrine is a potent vasopressor used to treat hypotension in the critical care setting. Recent studies have looked at norepinephrine's use in the obstetric setting, and have shown that it can be used safely and also has favourable hemodynamic properties when compared to phenylephrine, with less bradycardia and less depression of cardiac output. These studies have been limited to using norepinephrine as an infusion and there is limited data with it being used as a bolus to prevent hypotension. A recent study was undertaken at Mount Sinai hospital to determine the ED90 of norepinephrine to treat post spinal hypotension. Secondary outcome data from this trial showed that the incidence of bradycardia associated with this treatment is approximately 7.5%, several times less when compared to the reported 30% with phenylephrine. It would therefore be prudent at this stage to undertake a randomized trial comparing the hemodynamic profile of phenylephrine (our standard practice) and norepinephrine used as intermittent boluses to prevent hypotension and avoid decrease in heart rate during cesarean delivery.

Enrollment

112 patients

Sex

Female

Ages

18+ years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

  • Informed consent
  • Elective CS under spinal anesthesia
  • Normal singleton pregnancy beyond 36 weeks gestation
  • ASA physical status 2-3
  • Current (pregnant) weight 50-100 kg, height 150-180 cm
  • Age over 18 years

Exclusion criteria

  • Patient refusal
  • Inability to communicate in English
  • Allergy or hypersensitivity to phenylephrine
  • Preexisting or pregnancy-induced hypertension
  • Cardiovascular or cerebrovascular disease
  • Fetal abnormalities
  • History of diabetes, excluding gestational diabetes
  • Contra-indications for spinal anesthesia
  • Allergy or hypersensitivity to sulfite
  • Use of monoamine oxidase inhibitors, triptyline or imipramine antidepressants
  • Untreated hyperthyroid patients

Trial design

Primary purpose

Treatment

Allocation

Randomized

Interventional model

Parallel Assignment

Masking

Quadruple Blind

112 participants in 2 patient groups

norepinephrine 6mcg
Active Comparator group
Description:
norepinephrine, given as 1mL IV boluses, to treat post-spinal hypotension
Treatment:
Drug: Norepinephrine
phenylephrine 100mcg
Active Comparator group
Description:
phenylephrine, given as 1mL IV boluses, to treat post-spinal hypotension
Treatment:
Drug: Phenylephrine

Trial contacts and locations

1

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Data sourced from clinicaltrials.gov

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