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Oxygen transport, consumption and utilization during barbiturate intoxication

E Dominguez de villota, H Shubin, M H Weil

    Intensive Care Medicine
    |January 1, 1982
    PubMed
    Summary

    Short-acting barbiturate intoxication in patients without shock leads to reduced oxygen consumption. This decrease is due to lower oxygen requirements, not impaired oxygen availability or utilization.

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    Area of Science:

    • Cardiology
    • Toxicology
    • Critical Care Medicine

    Background:

    • Short-acting barbiturates are central nervous system depressants.
    • Barbiturate intoxication can affect cardiovascular and metabolic functions.

    Purpose of the Study:

    • To investigate oxygen availability and requirements in patients intoxicated with short-acting barbiturates.
    • To determine the cause of altered oxygen consumption in these patients.

    Main Methods:

    • Measurements of oxygen transport and consumption were performed in 14 patients with barbiturate intoxication.
    • Hemodynamic parameters, including cardiac index and mean arterial oxygen content, were assessed.
    • Arteriovenous oxygen difference, oxygen consumption, and oxygen extraction ratio were calculated.

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    Main Results:

    • Patients exhibited normal cardiac index and oxygen transport but decreased mean arterial oxygen content.
    • Arteriovenous oxygen difference and oxygen consumption were reduced.
    • The oxygen extraction ratio was decreased, indicating reduced oxygen utilization.

    Conclusions:

    • Barbiturate intoxication is associated with decreased oxygen consumption.
    • This reduction appears to be related to decreased metabolic oxygen requirements rather than impaired oxygen availability or utilization.