Routine broad application of the simplified Bernoulli equation in echocardiography can result in significant miscalculations of transvalvular pressure gradients due to ignored nonconvective forces.
Highlights the importance of understanding nonconvective forces and the limitations of the simplified Bernoulli equation to prevent miscalculation of transvalvular pressure gradients in echocardiography.
Echocardiography is routinely used to assess ventricular and valvular function, particularly in patients with known or suspected cardiac disease and who have evidence of hemodynamic compromise. A cornerstone to the use of echocardiographic imaging is not only the qualitative assessment, but also the quantitative Doppler-derived velocity characteristics of intracardiac blood flow. While simplified equations, such as the modified Bernoulli equation, are used to estimate intracardiac pressure gradients based upon Doppler velocity data, these modified equations are based upon assumptions of the varying contributions of the different forces that contribute to blood flow. Unfortunately, the assumptions can result in significant miscalculations in determining a gradient if not completely understood or they are misapplied. We briefly summarize the principles of fluid dynamics that are used clinically with some of the inherent limitations of routine broad application of the simplified Bernoulli equation.
Firstenberg et al. (Mon,) conducted a review in Cardiac disease. Simplified Bernoulli equation was evaluated. Routine broad application of the simplified Bernoulli equation in echocardiography can result in significant miscalculations of transvalvular pressure gradients due to ignored nonconvective forces.