What is the blue port on a Swan-Ganz catheter used for?

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Multiple Choice

What is the blue port on a Swan-Ganz catheter used for?

Explanation:
The blue port is the injectate lumen used for thermodilution cardiac output measurement. In practice, a cold saline bolus is injected quickly through this port into the right atrium. The thermistor at the distal tip detects the resulting temperature change as the bolus passes by, and the CO is calculated from the temperature-time curve. The blue color helps you identify the injection lumen, separate from the balloon inflation lumen and the pressure-sensing distal lumen.

The blue port is the injectate lumen used for thermodilution cardiac output measurement. In practice, a cold saline bolus is injected quickly through this port into the right atrium. The thermistor at the distal tip detects the resulting temperature change as the bolus passes by, and the CO is calculated from the temperature-time curve. The blue color helps you identify the injection lumen, separate from the balloon inflation lumen and the pressure-sensing distal lumen.

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