Abstract
Experimental studies by Sigel et all show that blood is echogenic in vitro. The echogenicity of blood also has been demonstrated in vivo but has always been related to reduced blood flow during, for example, left ventricular aneurysm2 and left atria1 dilatation secondary to long-standing mitral valve disease.3 In the same way, it is possible to observe homogeneous echoes of low acoustic density that are due to blood stasis in the pericardial cavity when it contains liquid blood.4 This report describes a study in dogs in which the movement of circulating blood was detected by echocardiography.
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