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Canadian Journal of Anesthesia, Vol 27, 550-552, Copyright © 1980 by Canadian Anesthesiologists' Society

Blood Viscosity and the Overnight Fast

H. B. ARONSON 1, TIFHA HORNE 2, S. H. BLONDHEIM 2, and J. T. DAVIDSON 3

1 Department of Anaesthesia, Hadassah-University Hospital, Mount Scopus, Jerusalem, Israel
2 Metabolic Laboratory and the Department of Medicine B, Hadassah-University Hospital, Ein Karem, Jerusalem, Israel
3 Department of Anaesthesia, Hadassah-University Hospital, Ein Karem, Jerusalem, Israel

A 12-hour overnight fast in 17 subjects did not result in a significant increase in blood viscosity, as occurs after a 24-hour fast. The usual preoperative fast does not therefore appear to have any adverse rheological effect. However, when it is necessary to prolong the fast, intravenous fluids should be given to prevent the expected increase in blood viscosity which then might have clinical effects as a result of decreased organ perfusion.






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Copyright © 1980 by the Canadian Anesthesiologists' Society.