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Phenylephrine as a simulated intravascular epidural test dose in pediatrics: a pilot study
Carlo Pancaro1, Viviane G Nasr, Jessica K Paulus
1Department of Anesthesiology, Tufts University School of Medicine, Boston, MA 02111, USA. carlopancaro@hotmail.com
Paediatric Anaesthesia
|March 29, 2013
Summary
Phenylephrine shows potential as a test dose indicator for intravascular injections in pediatric anesthesia. Further research is needed to establish reliable hemodynamic criteria for its use in children.
Area of Science:
- Anesthesiology
- Pediatric Medicine
- Pharmacology
Background:
- Neuraxial blocks in pediatrics require test doses to detect intravascular injection.
- Unrecognized intravascular local anesthetic injection can cause life-threatening complications in anesthetized children.
- Sevoflurane anesthesia in children can blunt hemodynamic responses to intravascular catecholamines.
Purpose of the Study:
- To explore hemodynamics and criteria for a positive test dose result using phenylephrine in sevoflurane-anesthetized children.
- To evaluate phenylephrine as a potential indicator for intravascular injection during pediatric neuraxial blocks.
Main Methods:
- Healthy children undergoing minor procedures were randomized to receive placebo or phenylephrine (5 μg∙kg⁻¹) intravenously during sevoflurane anesthesia.
- Hemodynamic responses (heart rate, blood pressure) were monitored for 5 minutes post-administration.
Main Results:
- All patients receiving phenylephrine experienced decreased heart rate (HR), with a 25% drop at 1 minute.
- Blood pressure increased in 54% of patients receiving phenylephrine.
- Not all patients receiving phenylephrine met the established positive criterion for a test dose response.
Conclusions:
- Phenylephrine may serve as a future indicator for positive intravascular test doses in pediatric anesthesia.
- Further investigation is required to determine the optimal phenylephrine dose and age-adjustment for reliable hemodynamic responses in children undergoing neuraxial blocks.
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