How is decreased cardiac output caused by increased fluid volume and decreased fluid volume?

Stroke volume. Cardiac output is determined by heart rate and volume of blood pumped by heart in each heartbeat (stroke volume). Increased fluid volume increases the stroke volume and therefore cardiac output. Decreased fluid volume decreases the stroke volume and therefore cardiac output.
CO explained. Cardiac output is the amount of blood your heart pumps, measures in liters per minute. If it is decreased it means the heart is unable to pump as strongly as it should. That means the heart can't keep up with the volume returning to it.

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How can decreased cardiac output be caused by either increased fluid volume and decreased fluid volume?

Cardiac output. When systolic dysfunction is present, volume overloading can result in decreased stroke volume and cardiac output. In any cardiac status, decreased intravascular volume will result in decreased cardiac output. Read more...