What lung conditions could cause brachycardia on exertion?

No messing around: Most symptomatic causes prompt an immediate doctor visit such as drug side/toxic effects, heart attack, ventricular arrhythmias, heart block, extra beats-PVCs, sick sinus syndrome and others. But as far as lung conditions they could be chronic pneumonia, interstitial disease, restrictive causes like kyphosis, idiopathic pulmonary hypertension, asthma, COPD...