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Correlation of blood temperature fluctuations with blood pressure waves

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Summary

Constant blood temperature in the pulmonary artery is assumed when the thermal dilution method is used for cardiac output determination. In some cases, however, slow temperature fluctuations (2–6 cycles per min.) occur in arterial and venous blood and interfere in the measurement. Those thermal fluctuations were investigated in the pulmonary artery and venae cavae of dogs. The temperature variations were found to be correlated with blood pressure waves: an increase of blood pressure was accompanied by an increase in the blood temperature in the pulmonary artery and a decrease in the blood temperature in the venae cavae. Therefore, measurement of the temperature of the pulmonary artery relative to that of the venae cavae does not rule out those fluctuations, and will not improve the thermal dilution method.

Zusammenfassung

Bei Bestimmung des Herzminutenvolumens nach der Kälteverdünnungsmethode wird eine konstante Bluttemperatur in der Pulmonalarterie unterstellt. Jedoch treten in einigen Fällen langsame Temperaturfluktuationen (2–6 Zykl. pro Minute) im arteriellen und venösen Blut auf, die mit der Messung interferieren. Diese Temperaturfluktuationen wurden in der Pulmonalarterie und V. cava des Hundes untersucht. Es zeigte sich, daß die Änderung der Temperatur mit den Blutdruckwellen korreliert sind: Ein Anstieg des Blutdrucks war von einem Anstieg der Bluttemperatur in der Pulmonalarterie und einem Rückgang der Temperatur in der V. cava begleitet. Die Meßprozedur läßt sich nicht dadurch verbessern, daß die Temperatur in der Pulmonalarterie auf die der Hohlvenen bezogen wird.

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Author notes

  1. M. Nitzan

    Present address: Medical Physics Group, Racah Institute of Physics, The Hebrew University of Jerusalem and Department of Diagnostic Radiology, Hadassah University Hospital, Jerusalem, Israel

Authors and Affiliations

  1. Department of Cardiothoracic Surgery, Hadassah University Hospital, Jerusalem

    A. Appelbaum, Y. Mahler & M. Nitzan

  2. Department of Medical Engineering, Hadassah University Hospital, Jerusalem

    A. Appelbaum, Y. Mahler & M. Nitzan

  3. Medical Physics Group, Racah Institute of Physics, The Hebrew University of Jerusalem and Department of Diagnostic Radiology, Hadassah University Hospital, Jerusalem, Israel

    A. Appelbaum & Y. Mahler

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  1. A. Appelbaum
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  2. Y. Mahler
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Appelbaum, A., Mahler, Y. & Nitzan, M. Correlation of blood temperature fluctuations with blood pressure waves. Basic Res Cardiol 77, 93–99 (1982). https://doi.org/10.1007/BF01908134

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  • DOI: https://doi.org/10.1007/BF01908134

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