Thermodilution injection technique

The computer constant must be set for the volume and temperature of the 5% glucose used. 10ml of ice-cold glucose provides the most accurate measure. 5ml of room temperature injectate is sufficiently precise for normal and high output states however its accuracy does worsen at low output values.

1. Press 'Start' button on computer.

2. Inject fluid smoothly over 2-3s.

3. Repeat at least twice more at random points in the respiratory cycle.

4. Average 3 measurements falling within 10% of each other. Reject outputs gained from curves that are irregular/non-smooth.

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