A 69-year-old woman complains of some atypical chest pain 2 days prior to presentation. On examination, the JVP is at 8 cm, positive Kussmaul sign, and normal heart sounds. The lungs are clear. The ECG is abnormal, and the CXR shows a normal cardiac silhouette.For the above patient with shortness of breath and peripheral edema, select the most likely diagnosis.
cardiac tamponade constrictive pericarditis restrictive cardiomyopathy right ventricle myocardial infarction (RVMI)