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Postnatal changes in transdiaphragmatic pressure in piglets.

J F Watchko, D E Mayock, T A Standaert

    Pediatric Research
    |July 1, 1986
    PubMed
    Summary
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    Diaphragmatic force output increases with age in piglets. This study found that transdiaphragmatic pressure (Pdi), an indicator of diaphragm force, significantly correlates with postnatal age, body weight, and diaphragm weight in developing piglets.

    Area of Science:

    • Physiology
    • Developmental Biology
    • Respiratory Mechanics

    Background:

    • The diaphragm is the primary muscle of respiration.
    • Understanding diaphragmatic development is crucial for assessing respiratory function in neonates and infants.
    • Maturation of diaphragmatic force output influences respiratory control and capacity.

    Purpose of the Study:

    • To investigate the relationship between diaphragmatic force output and maturation in piglets.
    • To determine if diaphragmatic force increases with postnatal age for a controlled neural input.

    Main Methods:

    • Twenty-five anesthetized piglets (4-21 days postnatal age) were studied.
    • Transdiaphragmatic pressure (Pdi) was measured as an index of diaphragmatic force output.
    • Supramaximal transvenous phrenic nerve stimulation at 100 Hz controlled for neural drive.

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    Main Results:

    • Mean Pdi was 53 ± 17 cm H2O.
    • A significant positive correlation was found between Pdi and postnatal age (r=0.79, p<0.001).
    • Pdi also positively correlated with total body weight (r=0.73, p<0.001) and diaphragmatic wet weight (r=0.77, p<0.001).

    Conclusions:

    • Diaphragmatic force output demonstrates a developmental pattern of increase with postnatal age in piglets.
    • This increase in force output is associated with greater body weight and diaphragm muscle mass.
    • The observed developmental changes occur independently of the voltage required for maximal phrenic nerve stimulation.