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A robust analysis of alternate methods for estimating blood volume.

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Blood volume estimation in cardiac surgery - A comparative analysis.

Philip Cumpston^1,2

¹Visiting Senior Specialist Anaesthetist, 3621Greenslopes Private Hospital, Greenslopes, QLD, Australia.

|March 29, 2022

Summary

The Nadler formula best estimates blood volume in North American adults compared to Allen or saline haemodilution methods. This formula is recommended for cardiac surgery patients, but requires broader population data for improved accuracy.

Keywords:

Allen Hilberath Nadler blood volume estimation comparative study robust statistics saline haemodilution

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Area of Science:

Physiology
Medical Statistics

Background:

Accurate blood volume estimation is crucial for clinical applications, especially in cardiac surgery.
Existing formulas for blood volume calculation vary in their accuracy and applicability.

Purpose of the Study:

To compare the accuracy of three published formulas for estimating normal human blood volume.
To determine which formula most closely correlates with measured blood volumes.

Main Methods:

Compared predicted blood volumes from Nadler, Allen, and saline haemodilution formulas against measured volumes from Retzlaff et al.'s study.
Employed statistical analyses including the two-tailed Wilcoxon signed rank test and Bland-Altman analysis.

Main Results:

The Nadler formula demonstrated the highest correlation with measured blood volumes in a North American population sample.
The Allen formula and saline haemodilution technique showed lower correlation compared to the Nadler formula.

Conclusions:

The Nadler formula is recommended for estimating blood volume in adult patients undergoing cardiac surgery, particularly those with North American anthropometric characteristics.
Saline haemodilution techniques require further validation against nuclear medicine methods.
Future blood volume estimation formulas should be based on more comprehensive population samples, including diverse height, weight, and cardiac conditions.