The<unk>  is the calculated by measuring the transverse diameter of the heart on a posterior / anterior chest X ray x-ray examination and dividing it by the diameter of the thoracic cage.  A value > 0.5 or one half is consistent with enlargement of the heart or cardiomegaly."
Cardiothoracic ratio
Ventilation/perfusion ratio
Pulmonary capillary wedge pressure
Ejection fraction
Pulmonary compliance
Diffusion capacity
Alveolar-arterial gradient
Lung allocation score