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Related Experiment Videos

Respiratory patterns during progressive asphyxia in newborn rabbits

E E Lawson, B T Thach

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |September 1, 1977
    PubMed
    Summary

    During asphyxia, respiratory control interruptions, not respiratory center failure, cause primary apnea in rabbits. Gasping precedes apnea, linked to prior respiratory pattern changes, not a distinct center.

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    Area of Science:

    • Neonatal physiology
    • Respiratory control mechanisms
    • Neuroscience

    Background:

    • Acute asphyxia triggers a transition from regular breathing to apnea and gasping.
    • Understanding this transition is crucial for neonatal resuscitation and understanding respiratory control.

    Purpose of the Study:

    • To investigate the physiological and neural mechanisms underlying the transition to primary apnea and gasping during acute progressive asphyxia in neonatal rabbits.

    Main Methods:

    • Measurements included inspiratory duration (TI), expiratory duration (TE), maximal inspiratory tracheal pressure (Pmax), electromyographic activity (EMG), and electrocorticogram (ECoG).
    • Airway occlusion at functional residual capacity (FRC) was performed in 3- to 5-day-old rabbits.

    Main Results:

    • Primary apnea onset correlated with central nervous system events (decerebrate posture, maximal EMG) followed by relaxation and loss of EMG/isoelectric ECoG.
    • Inspiratory drive indices (Pmax, Pmax/TI) were maintained or increased post-apnea, despite reduced overall respiratory activity.
    • Gasping was associated with pre-apneic respiratory pattern changes, not a separate 'gasping center'.

    Conclusions:

    • Primary apnea results from disrupted respiratory cycling control, not respiratory center failure.
    • The findings challenge the existence of a dedicated 'gasping' center, linking it to preceding respiratory dynamics.

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