Table 2. Comparison of Potential Efficacy of ANH in Two Theoretical Patients of Differing Sizes, with Expected Surgical Blood Losses of 4.0, 6.0, and 8.0 l
Theoretical patient 1 is male, 60 kg, 157.5 cm tall. Theoretical patient 2 is male, 90 kg, 182.9 cm tall. Blood volume was estimated using the equation from reference 8. For both patients, Ho= 0.45 and Ht= 0.21. Note that the determinants of the likely utility of acute normovolemic hemodilution (ANH), VRem/VBld, and VLOSSmax/VBldare the same for both patients but that the degree of efficacy (erythrocytes saved) is not.
* Use of any conservation strategy, including ANH, or transfusion of erythrocytes would not be necessary (expected blood loss/VBldis less than VRem/VBld).
EBL = expected blood loss; see text for definitions of other abbreviations.