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Post-operative respiratory function: a ventilation-perfusion study

A Morton, P Mahoney, P Hansen

    Anaesthesia and Intensive Care
    |August 1, 1976
    PubMed
    Summary
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    General anesthesia for abdominal surgery can cause hypoxemia due to increased physiological dead space. This change, linked to faster breathing (tachypnoea), impacts gas exchange after surgery.

    Area of Science:

    • Anesthesiology
    • Respiratory Physiology

    Background:

    • Post-abdominal surgery hypoxemia is common.
    • It's often linked to ventilation-perfusion mismatch.

    Purpose of the Study:

    • To investigate changes in physiological dead space after abdominal surgery under general anesthesia.
    • To determine the cause of increased dead space.

    Main Methods:

    • Measured physiological dead space to tidal volume ratio.
    • Assessed patients undergoing general anesthesia for abdominal surgery.

    Main Results:

    • A small increase in physiological dead space to tidal volume ratio was observed.
    • This increase was associated with tachypnoea (rapid breathing).

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    Conclusions:

    • General anesthesia for abdominal surgery increases physiological dead space.
    • Tachypnoea, not altered pulmonary blood flow, is the likely cause.