Myocarditis Atrial Fibrillation Pacemakers Congenital Heart Defects Cardiomegaly Arrhythmia Atrial Flutter Cardiac Arrest Heart Pacemaker Mitral Valve Heart Block Heart Attacks Ventricular Tachycardia Heart Procedures Hypertrophic Cardiomyopathy Mitral Regurgitation Diagnostic Tools Pericarditis Spontaneous Coronary Artery Dissection Procedures Heart Failure
The 87-year-old monarch remains under observation in Oslo as Crown Prince Haakon continues with planned state travel to Poland.