How can one decrease central venous pressure?

Decrease Preload: Central venous pressure (CVP) is that pressure that is measured in the veins of the thorax just before entry into the heart. Factors that effect CVP include intravascular volume status, right heart function and pulmonary vascular resistance. Most often, CVP is reduced either by diuretics (volume reduction) or nitrates (increase venous capacitance).

CVP: Central venous pressure (CVP) is generally measured in a large vein returning blood to the heart or estimated on physical examination by pressure waves seen in the jugular vein in the neck. It often reflects intravascular volume and/or right heart pressure. Depending on the cause your physician may recommend sodium and fluid restriction and/or diuretic therapy. You should discuss w/ your doctor.