Perhaps you should try some spelling variations:
pulmonary arteries » pulmonary arterial (Expand search), pulmonary artery (Expand search), pulmonary arteriovenous (Expand search)
decrease pulmonary » decreases pulmonary (Expand search), increased pulmonary (Expand search), increases pulmonary (Expand search)
decrease walking » increase walking (Expand search), decreases weaning (Expand search), decrease during (Expand search)
walking decrease » walking decreases (Expand search), warming decreases (Expand search), taping decrease (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
or decrease » not decrease (Expand search), _ decrease (Expand search), and decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease OR decrease to decrease ) OR ( decrease walking decrease pulmonary arteries ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease or decrease to decrease ) OR ( decrease walking decrease pulmonary arteries ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease or decrease to decrease ) OR ( decrease walking decrease pulmonary arteries ))*.