Table 2.

Potential errors during bolus thermodilution measurements.

Type of error	Reason	Corrective actions
Slow inject	Injection too slow with >0.60 s between the start of the decline in temperature and the nadir at the proximal thermistor	•Use a 3 cc syringe •Inject with a rapid and vigorous motion •Make certain the injection is even with a distinct end
Timeout	Temperature did not return to baseline in time (> 8 s) at the distal thermistor	•Check that the guide is not too deeply engaged •Confirm that there is flow in the artery, if too occlusive stenosis the case may be unsuitable for thermodilution •Make sure that baseline temperature is 0 •Zero temperature and retry injection
Low amp	The temperature response did not reach the minimum limit during injection (<–1 °C) at the distal thermistor	•Verify guide engagement •Flush guide with fresh room temperature saline •Increase bolus or use slightly chilled saline if needed •Make sure wire is not too distal in vessel •Zero temperature and repeat injection