The results showed that transverse diameter. longitudinal diameter of the heart. cardiac area and cardio- thoracic ratio decreased markedly after labor(P<0.01 ).
结果：心脏横径、心脏长径、心脏面积、心胸比率较初入高原时显著缩小（P＜0．01）；
The results showed that transverse diameter. longitudinal diameter of the heart. cardiac area and cardio- thoracic ratio decreased markedly after labor(P<0.01 ).
结果：心脏横径、心脏长径、心脏面积、心胸比率较初入高原时显著缩小（P＜0．01）；
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