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Related Experiment Videos

Effect of glycerol on furosemide-caused EP decrease in guinea pig neonates.

M Ohmura, Y Raphael, N Kanoh

    Acta Oto-Laryngologica
    |January 1, 1985
    PubMed
    Summary
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    Furosemide more effectively reduced the endocochlear potential in young guinea pigs than adults. Glycerol did not enhance this effect in neonates, suggesting an immature blood-cochlea barrier in young animals.

    Area of Science:

    • Ototoxicity and Auditory Science
    • Pharmacology of Diuretics
    • Neonatal Physiology

    Background:

    • Furosemide, a loop diuretic, is known to reduce the endocochlear potential (EP) in adult guinea pigs.
    • Glycerol was previously hypothesized to enhance furosemide's ototoxic effects by opening the blood-cochlea barrier (BCB).
    • The current study investigates if glycerol potentiates furosemide's action in neonate guinea pigs.

    Purpose of the Study:

    • To determine if glycerol potentiates the ototoxic effect of furosemide in neonate guinea pigs.
    • To compare the effect of furosemide on EP in neonate versus adult guinea pigs.
    • To assess the maturity of the blood-cochlea barrier in neonates.

    Main Methods:

    • Administration of furosemide (10-30 mg/kg) to neonate guinea pigs.

    Related Experiment Videos

  • Pretreatment with glycerol (50% v/v, 1 ml/kg) 15 minutes before furosemide administration in a separate group.
  • Measurement of endocochlear potential (EP) in both groups and comparison with adult data.

    • Main Results:

    • Furosemide significantly reduced the EP in neonate guinea pigs.
    • The reduction in EP by furosemide was more pronounced in neonates compared to adults.
    • Glycerol pretreatment did not potentiate the furosemide-induced reduction of EP in neonates.

    Conclusions:

    • The neonate blood-cochlea barrier may be functionally immature, limiting glycerol's ability to enhance furosemide penetration.
    • Furosemide exhibits a greater ototoxic effect in neonates than in adults, possibly due to developmental differences in cochlear function.
    • Further research is needed to fully elucidate the developmental aspects of the blood-cochlea barrier and drug penetration in the neonatal inner ear.