Other physical methodspreoperative haemodilution

Involves reducing the Hb concentration prior to surgery. Reduces blood viscosity and red cell loss (through reduced haematocrit). Provides a bank of freshly collected autologous whole blood for return later.

• 2-3 units of blood are collected with replacement using crystalloids or colloid solutions.

• Hb is reduced to ~10 g/dL and haematocrit to 30% (0.3).

• O2 transport improves (increased cardiac output).

• Used mainly in younger patients and in those with no pre-existing cardiopulmonary disease.

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