Methods: A rat model of COPD was established by passive smoking and instillation of Porcine PancreaticElastase (PPE) into the airways.
方法：通过被动吸烟和气道注射猪胰弹性蛋白酶（PPE）建立COPD大鼠模型。
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Fecal elastase-1 is a test which documents exocrine gland function of pancreas by the content of elastase-1 in stool, a simpler one compared to other indirect exocrine pancreatic function tests.