The results showed that transversediameter. 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）；
2
The cardio-thoracic ratio, expressed as a percentage, is the ratio between the maximum transversediameter of the heart and the maximum width of the thorax.