Figure 51-12 A, Two-dimensional echocardiogram in the short-axis view across the ventricles demonstrating the presence of intramyocardial air (arrow) in the ventricular septum and right ventricular wall. The intramyocardial air appears as a dense, "snowy" echogenic area. Note the associated wall motion abnormality appearing as flattening of the ventricular septum. B, The patient was treated with phenylephrine, increasing systemic and coronary perfusion pressure, resulting in clearance of the air and the echogenic density and restoration of normal left ventricular (LV) wall motion and configuration.