Cardiology Research and Practice / 2012 / Article / Fig 2

Review Article

Appreciating the Strengths and Weaknesses of Transthoracic Echocardiography in Hemodynamic Assessments

Figure 2

Schematic diagram showing proper and improper ultrasound longitudinal planes in measuring left ventricular outflow tract (LVOT) diameter. Oblique plane is resulted from a tilted angle from the proper plane, while a parallel shift in ultrasound plane results in a tangential planes. Both oblique and tangential planes give rise to underestimation of LVOT diameter. The same is true for measuring inferior vena cava diameter.
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