Figure 21.5 Right-sided pathology associated with cardiac arrest. (a) PLAX view demonstrating a dilated RV in acute PE. (b) M-mode showing a dilated RV and paradoxical septal motion (arrowed) in acute PE. (c) PSAX view demonstrating significant right ventricular dilatation, with a D-shaped septum. This patient had chronic right ventricular disease secondary to congenital heart disease. (d) A4C view immediately post-cardiac arrest showing opacification of the right heart due to massive air embolism (arrowed). LA, left atrium; LV, left ventricle; RA, right atrium; RV, right ventricle.