ely.РРA type of the heart can derive from several heart diseases. For example,РThe mitral type of the heart may originate from pulmonary heart diseases, rheumatic heart diseases, congenital heart diseases of shunt from left to right.РThe aortic type of the heart may come from hypertensive heart diseases, rheumatic heart diseases (involing aortic valves), congenital heart diseases, cardiomyopathy.РThe general enlarged type of the heart may come from cardiomyopathy, pericardial effusion.РР2. Different routine projections of the? cardiac atria and ventriclesРPA: posteroanterior radiograph（后前位）?LL: left lateral radiograph（左侧位）?RAO: right anterior oblique radiograph（右前斜位）?LAO: left anterior oblique radiograph（左前斜位）РРPA: posteroanterior radiograph（后前位）РРLL: left lateral radiograph（左侧位）
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