再生障碍性貧血是由于骨髓造血障碍,紅髓显著減少,以全血細胞減少为主要表现的临床綜合征。已知可因化学、药物、感染等因素引起。近年认为本病的根本原因是骨髓多能干細胞衰竭,不能向定向干細胞分化,或因骨髓造血微环境病变,使干細胞不能进一步分化、增殖、成熟为粒、紅、巨三系細胞而致的骨髓造血功能衰竭。慢性再障时、因骨髓呈“向心性”萎縮,常出现代偿性病理性增生灶,不同部位穿刺骨髓可呈增生重度低下、低下、活跃、明显活跃等不同表现。如仅依据一次局部 Aplastic anemia is due to bone marrow hematopoietic disorders, red pulp significantly reduced to pancytopenia as the main clinical manifestations syndrome. Known for chemical, pharmaceutical, infection and other factors. In recent years, the root cause of this disease is thought to be bone marrow pluripotent stem cells failure, differentiation to targeted stem cells, or bone marrow hematopoietic microenvironment lesions, so that stem cells can not be further differentiated, proliferated, mature into granulosa, red, giant cells of the bone marrow Hematopoietic failure. Chronic aplastic anemia, because the bone marrow showed “centripetal” atrophy, often compensatory pathological hyperplasia, different parts of the bone marrow puncture showed severe low, low, active, obviously active and other performance. If only based on a local