to evaluate the p wave changes in the electrocardiogram ( ecg ) in chronic lung diseases , we examined ecgs from twenty patients with interstitial pulmonary fibrosis ( the fld group ) and twenty patients with chronic obstructive lung disease ( fifteen with pulmonary emphysema and five with bronchial asthma , the cold group ) .
C0024117
chronic obstructive lung
C0034067
pulmonary emphysema