心肌肥大

图示心肌肥大（左心室） 心肌纤维的数量虽然没有增加，但是心肌纤维为了适应心脏负荷的增加而体积增大（肥大）。此为高血压病人肥大的心脏，左心室明显增厚。

This is cardiac hypertrophy involving the left ventricle. The number of myocardial fibers does not increase, but their size can increase in response to an increased workload, leading to the marked thickening of the left ventricle in this patient with systemic hypertension.