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Static pulmonary compliance in ponies.

C A Rawlings, M L Birnbaum, G E Bisgard

    Journal of Applied Physiology
    |April 1, 1975
    PubMed
    Summary
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    Pulmonary and total compliance in ponies significantly correlates with body weight and physical measurements. These findings are repeatable, offering reliable data for respiratory research.

    Area of Science:

    • Comparative Physiology
    • Respiratory Mechanics
    • Equine Medicine

    Background:

    • Understanding respiratory mechanics is crucial for diagnosing and treating pulmonary conditions in animals.
    • Pulmonary and total compliance are key indicators of lung function and respiratory system elasticity.
    • Limited data exists on the relationship between physical characteristics and respiratory compliance in ponies.

    Purpose of the Study:

    • To measure static pulmonary and total compliance during expiration in healthy anesthetized ponies.
    • To investigate the correlation between compliance values and various physical parameters of the ponies.
    • To assess the repeatability of compliance measurements over time.

    Main Methods:

    • Static pulmonary compliance (Cl) and total compliance (Ct) were measured during expiration in 15 healthy anesthetized ponies.

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  • Ponies had a mean body weight of 140.6 kg (range: 83.6–211.4 kg).
  • Measurements were repeated on consecutive days in four ponies to assess day-to-day variability.

    • Main Results:

    • Mean total compliance (Ct) was 168.7 ± 47.2 ml/cmH2O.
    • Mean pulmonary compliance (Cl) was 368.4 ± 90.3 ml/cmH2O.
    • Both Ct and Cl were significantly dependent on body weight, calculated surface area, height at the withers, and chest circumference.

    Conclusions:

    • Static pulmonary and total compliance in ponies are significantly influenced by body weight and physical dimensions.
    • The established relationships provide a basis for interpreting compliance data in ponies of varying sizes.
    • Repeatability of measurements confirms the reliability of the methodology for future respiratory studies in equines.