Fig. 1

Comparison of computed tomography and echocardiography LA volume measurements obtained from the same patient with atrial fibrillation undergoing evaluation for pulmonary vein isolation procedure. A, Computed tomographic 4-chamber reconstruction at the maximal LA basal and longitudinal dimensions. B, Computed tomographic 2-chamber reconstruction at the maximal LA basal and longitudinal dimensions. A and B show LA volume measurement by the CT area-length method. C, Echocardiographic 4-chamber view. D, Echocardiographic 2-chamber view. C and D show LA volume measurement by echocardiographic area-length method. The inherent challenges of echocardiography, including adequate visualization of the LA, foreshortening and tracing difficulties are demonstrated