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Blood temperature and cardiovascular stability in hemofiltration.

F Pizzarelli, S Sisca, C Zoccali

    The International Journal of Artificial Organs
    |January 1, 1983
    PubMed
    Summary
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    Temperature changes during extracorporeal circuits impact cardiovascular tolerance in hemodialysis (HD) and hemofiltration (HF). Similar heat loss/gain between HD and HF results in comparable blood pressure changes, indicating temperature

    Area of Science:

    • Nephrology
    • Cardiovascular Physiology
    • Biomedical Engineering

    Background:

    • Extracorporeal circuits, used in renal replacement therapies like hemodialysis (HD) and hemofiltration (HF), involve blood flow outside the body.
    • Temperature (T) fluctuations in blood within these circuits can significantly influence patient cardiovascular tolerance during fluid removal.
    • Understanding the specific impact of temperature changes during different extracorporeal therapies is crucial for optimizing patient safety and treatment efficacy.

    Purpose of the Study:

    • To investigate the effect of blood temperature changes during postdilutional hemofiltration (HF) on cardiovascular stability.
    • To compare the effects of HF and HD on mean arterial pressure (MAP) and heart rate (HR) under conditions of equivalent blood temperature in the extracorporeal circuit.
    • To determine if HF offers a distinct advantage over HD regarding cardiovascular tolerance when temperature variations are controlled.

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    Main Methods:

    • Comparison of cardiovascular parameters (MAP, HR) between HF and HD sessions.
    • Control of blood temperature within the extracorporeal circuit to achieve equivalent heat loss or heat gain scenarios.
    • Utilizing postdilutional hemofiltration (HF) as the primary therapy under investigation.

    Main Results:

    • Hemofiltration (HF) involves some heat loss from the blood in the extracorporeal circuit.
    • When heat loss is normalized, hemodialysis (HD) provides similar blood pressure protection as HF.
    • At equivalent heat gain, HF induces a degree of hypotension comparable to that observed in HD.

    Conclusions:

    • Blood temperature changes within the extracorporeal circuit significantly affect vascular stability (VS) during hemofiltration (HF).
    • The observed marginal benefit of HF over HD, even with equalized temperature changes, requires further investigation.
    • Temperature management is a critical factor influencing cardiovascular tolerance in both HD and HF therapies.