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©2013 UpToDate ® Print Email Planimetry of the left atrium for volume calculation from the apical 2 chamber (long axis) view Panel A is schematic of the structures imaged from the apical two-chamber view and panel B is the actual echocardiogram. The apical two-chamber view at end-systole is used for a computer-generated planimetric tracing from which both single and biplane atrial volumes can be obtained (panel C). A biplane volume estimation, combining the two- and four-chamber planimetric information, is preferred. LV: left ventricle; LA: left atrium; mv: mitral valve; pv: pulmonic valve; R: right; L: left; A: apex; B: base.