Transthoracic echocardiography (TTE), parasternal short-axis view (A) and apical 4-chamber view (B): a markedly enlarged right ventricle (RV) in a patient with idiopathic pulmonary hypertension. Left heart compression, right atrial (RA) dilation, and pericardial effusion (arrow) are markers of poor prognosis. LA, left atrium; LV, left ventricle. Figure courtesy of Dr Adam Torbicki.