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Exposure to halothane and enflurane affects learning function of murine progeny
Anesthesia and Analgesia
|November 1, 1981
Summary
Prenatal exposure to halothane and enflurane anesthetics impaired maze learning in mice offspring. Even second-generation mice showed deficits, suggesting potential genetic effects from anesthetic exposure.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- Anesthetic agents are widely used in medical procedures.
- The effects of prenatal exposure to common anesthetics on offspring neurodevelopment require further investigation.
Purpose of the Study:
- To evaluate the impact of prenatal halothane and enflurane exposure on the learning function of murine offspring.
- To determine if anesthetic exposure during specific gestational periods influences cognitive performance.
- To explore potential long-term or genetic effects of prenatal anesthetic exposure.
Main Methods:
- Murine dams were exposed to varying concentrations of halothane or enflurane during specific gestational days.
- Offspring cognitive performance was assessed using a timed maze task at 6-7 weeks of age.
- Control groups consisted of age-matched mice without prenatal anesthetic exposure.
- Blood pressure and arterial blood gas measurements were taken in a subset of dams.
Main Results:
- Offspring exposed to halothane in utero demonstrated initial poor performance in the maze, with the most significant deficits observed in the group exposed late in gestation.
- While performance improved with training, halothane-exposed mice remained significantly slower than controls.
- Enflurane-exposed offspring also showed initial learning impairments, with significant progress during training but still slower performance compared to controls.
- Second-generation offspring from dams exposed to halothane late in pregnancy exhibited slower maze performance, suggesting possible transgenerational effects.
Conclusions:
- Prenatal exposure to halothane and enflurane negatively impacts the learning abilities of murine offspring.
- The timing and concentration of anesthetic exposure during gestation may influence the severity of cognitive deficits.
- Evidence suggests a potential for anesthetic-induced genetic effects, as indicated by impaired performance in the second generation.