False measurements in thermodilution

Question 1

Normal cardiac output:

Answer 1

4-6.5 L/min

Question 2

What does the thermodilution technique measure?

Answer 2

It measures RV output and pulmonary artery blood flow

Question 3

What are some assumptions being made when you use the thermodilution catheter?

Answer 3

Flow is constant
blood volume is constant (no rapid IV fluid admin)
Volume and temp of injectate is correct
No intracardiac shunts
No significant tricuspid or pulmonic valve regurgitation

Question 4

What does this do to the thermistor reading: Small injectate volume

Answer 4

False increase with small injectate volume

Question 5

What does this do to the thermistor reading: Increased temperature of injectate

Answer 5

False increase with increased temp of injectate

Question 6

What does this do to the thermistor reading: Thrombus on thermister

Answer 6

False increase with thrombus

Question 7

What does this do to the thermistor reading: Very low cardiac output state

Answer 7

False increase with low CO

Question 8

What does this do to the thermistor reading: Large injectate volume

Answer 8

False decrease with large injectate

Question 9

What does this do to the thermistor reading:: Decreased temperature

Answer 9

False decrease with decreased temperature

Question 10

What does this do to the thermistor reading: Inflation cycle of lower limb sequential compression devices:

Answer 10

False decrease with inflation of SCDs

Question 11

What does this do to the thermistor reading: Rapid continuous infusion of IV fluid secondary to cooling effect on blood

Answer 11

False decrease with continuous infusion