<unk>  regurgitation (TR) can be broadly classified as primary or secondary. Primary (or organic) TR results from an organic lesion of the<unk>  valve itself, whereas secondary (or functional) TR is caused by left heart failure or pulmonary hypertension without an intrinsic abnormality of the<unk>  valve.
Tricuspid regurgitation classification
Tricuspid stenosis classification
Mitral regurgitation classification
Pulmonic regurgitation classification
Aortic stenosis classification
Left ventricular aneurysm classification
Aortic insufficiency classification of severity
Atrial septal defect classification