Final answer:
In a patient with significant mitral regurgitation, the left atrial cardiac catheterization pressure tracing may show an increase in the v wave.
Step-by-step explanation:
In a patient with significant mitral regurgitation, the left atrial cardiac catheterization pressure tracing may demonstrate an increase in the v wave. The v wave represents the increase in pressure in the left atrium during ventricular systole, which occurs when blood flows backward into the atrium due to mitral valve regurgitation.