The right ventricular systolic pressure in a patient with tricuspid regurgitation can be estimated based on the physical examination and Doppler echocardiography.
right ventricular systolic pressure in mm Hg =
= (jugular venous pressure in mm Hg) + (pressure gradient across the tricuspid valve in mm Hg)
jugular venous pressure in mm Hg =
= ((vertical height of blood in the jugular vein above the sternal angle in cm with the patient recumbent at 45 degrees) + 5 cm) / 1.3
pressure gradient across the tricuspid valve in mm Hg =
= 4 * ((maximum velocity of the regurgitant jet in meters per second)^2)
where:
• The equation for pressure gradient is a modified Bernoulli equation.
• 1.3 is the conversion between cm blood and mm Hg at body temperature.
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