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Changes in systolic time intervals during stepwise increasing hypoxia.

J P Rasmussen, P Bech-Jansen, T Kann

    Acta Anaesthesiologica Scandinavica
    |January 1, 1975
    PubMed
    Summary
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    Hypoxia stimulates cardiac function, as shown by changes in pre-ejection period (PEP) and PEP/left ventricular ejection time (LVET) ratio in dogs. Cardiac stimulation persisted even during severe hypoxia.

    Area of Science:

    • Cardiovascular Physiology
    • Respiratory Physiology
    • Animal Models

    Background:

    • Hypoxia, a state of low oxygen, significantly impacts cardiovascular function.
    • Systolic time intervals (STIs) are sensitive indicators of cardiac performance.
    • Understanding cardiac responses to hypoxia is crucial for clinical management.

    Purpose of the Study:

    • To investigate the cardiac functional response to stepwise increasing hypoxia in a canine model.
    • To determine the threshold of arterial oxygen tension (Pao2) at which significant cardiac changes occur.
    • To evaluate the persistence of cardiac stimulation during severe hypoxic conditions.

    Main Methods:

    • Measurements of 1/PEP-2 and PEP/LVET-ratio in seven mongrel dogs.
    • Stepwise increasing hypoxic conditions were induced.

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  • Arterial oxygen tension (Pao2) was monitored throughout the experiment.

    • Main Results:

    • A decrease in PEP/LVET-ratio and an increase in 1/PEP-2 indicated cardiac stimulation.
    • Significant changes were observed when Pao2 fell below 40 mmHg.
    • Despite some deterioration during severe hypoxia (Pao2 15-20 mmHg), cardiac stimulation persisted until death.

    Conclusions:

    • The canine heart exhibits a stimulated response to hypoxia, measurable through specific systolic time intervals.
    • A Pao2 threshold exists below which these cardiac adjustments become significant.
    • The cardiac stimulation observed suggests a compensatory mechanism that endures even under life-threatening hypoxic conditions.