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Halothane as an anesthetic for fetal surgery
J F Sabik1, R S Assad, F L Hanley
1Department of Cardiovascular Surgery, Children's Hospital, Harvard Medical School, Boston, MA 02115.
Journal of Pediatric Surgery
|April 1, 1993
Summary
Halothane anesthesia during fetal surgery significantly reduces fetal cardiac output and placental blood flow, disrupting cardiovascular homeostasis. This anesthetic agent is not recommended for fetal interventions due to these adverse effects.
Area of Science:
- Anesthesiology
- Fetal Medicine
- Cardiovascular Physiology
Background:
- Halothane is commonly used in maternal inhalation anesthesia for fetal surgery due to uterine relaxation.
- Limited data exists on halothane's impact on fetal cardiovascular homeostasis during these procedures.
Purpose of the Study:
- To evaluate the acute effects of maternal halothane inhalation anesthesia on fetal cardiovascular parameters.
- To compare these effects with ketamine anesthesia and non-anesthetized fetal sheep.
Main Methods:
- Pregnant ewes underwent halothane anesthesia; fetuses were instrumented for cardiovascular evaluation.
- Fetal cardiac output and placental blood flow were measured using radiolabeled microspheres.
- Hemodynamics, blood gases, and vascular resistances were assessed and compared to control groups.
Main Results:
- Halothane anesthesia led to significant decreases in fetal cardiac output and placental blood flow.
- Total and placental vascular resistance increased, causing blood shunting away from the placenta.
- These changes resulted in impaired fetal respiratory gas exchange.
Conclusions:
- Halothane anesthesia negatively impacts fetal cardiac function and vasculature, disrupting cardiovascular homeostasis.
- The observed effects, including reduced blood flow and gas exchange, are not seen with other anesthetic agents.
- Halothane is considered a suboptimal anesthetic choice for fetal interventions.