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cardiology clinical cardiology heart failure ecg heart attack rheumatic heart disease diabetes medicine cardiothorasic arryhtmia supraventricular tachycardia ecg localisation surgery acc 2015 guideline mechanical valve valve surgery prosthetic valve fontan cyanotic hear disease hemodynamics clinical approach bedside classification malpositions congenital heart disease timing cycle harwares troubleshoot pacemaker vit d deficiency and cardiovascular risks radiology nuclear medicine angina circullatory collapse hypotension shock coronary artery disease aortic regurgitation mitral regurgitation aortic stenosis valvular heart disease history mitral stenosis sglt2 inhibitors acute rheumatic fever svt svt vs vt myocardial infarction spiranolactone abpm refractory resistant hypertension