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Assessment of intercommunication between the right ventricle and pericardial cavity. Microcavitation contrast is injected through the drainage tube to assess intercommunication between the right ventricle and pericardial cavity. There is no inflow from the pericardial cavity to the right ventricle (white arrow indicates the pericardial cavity). RV, right ventricle; RA, right atrium; LV, left ventricle; LA, left atrium.
