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Effect of Opening a Large Fistula on Circulatory Conditions

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Effect of Opening a Large Fistula on Circulatory Conditions

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Questions and Answers

What is the effect of sympathetic inhibition caused by total spinal anesthesia on cardiac output?

The cardiac output increases by 80 percent

The Psf falls to about 4 mm Hg (correct)

The cardiac output remains constant

The Psf increases significantly

After sympathetic inhibition by total spinal anesthesia, how does the effectiveness of the heart as a pump change?

Increases significantly

Increases to 100 percent of normal

Decreases to about 80 percent of normal (correct)

Remains constant

What happens to cardiac output after sympathetic inhibition caused by total spinal anesthesia?

Remains constant

Falls to about 60 percent of normal (correct)

Increases significantly

Doubles

What is the effect of opening a large arteriovenous fistula on cardiac output?

Increases Signup and view all the answers

What is the primary role of sympathetic stimulation on cardiac output?

Increase cardiac output Signup and view all the answers

How do circulatory changes usually occur after opening a large AV fistula?

Gradually Signup and view all the answers

What is the expected impact on venous return when the Psf falls to about 4 mm Hg?

Reduces venous return Signup and view all the answers

How does maximal sympathetic stimulation affect cardiac output compared to moderate sympathetic stimulation?

Maximal stimulation increases cardiac output more than moderate stimulation Signup and view all the answers

What is the expected change in right atrial pressure during sympathetic inhibition caused by total spinal anesthesia?

Decrease significantly Signup and view all the answers

Which event leads to an immediate decrease in cardiac output?

Opening a large AV fistula Signup and view all the answers