Key result
Isovolaemic haemodilution increased mean myocardial blood flow by 92% compared to control, maintaining normal PO2, whereas methaemoglobinaemia increased flow by only 15% and impaired oxygen supply.
Why the study?
Does isovolaemic haemodilution or methaemoglobinaemia alter myocardial blood flow and oxygen supply in anaesthetised dogs?
Does isovolaemic haemodilution or methaemoglobinaemia alter myocardial blood flow and oxygen supply in anaesthetised dogs?
The rheological effects of haemodilution play an important role in maintaining myocardial oxygen supply, whereas methaemoglobinaemia severely curtails it due to reduced oxygen capacity without adequate compensatory flow.
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Haemodilution's rheological effects may aid myocardial oxygenation in experimental anaemia; leaves open translation to human perioperative risk.
Biro et al. (1979) studied Anaesthetised dogs. Isovolaemic haemodilution or methaemoglobinaemia vs. Control exchange-transfusion was evaluated on Myocardial blood flow and coronary sinus PO2. Isovolaemic haemodilution increased mean myocardial blood flow by 92% compared to control, maintaining normal PO2, whereas methaemoglobinaemia increased flow by only 15% and impaired oxygen supply.
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