Combined Effect of Obstructive Sleep Apnea and Preserved Ratio Impaired Spirometry on Cardiovascular Outcomes.
BACKGROUND Obstructive sleep apnea (OSA)-chronic obstructive pulmonary disease overlap syndrome has been linked to worse cardiovascular outcomes. Preserved ratio impaired spirometry (PRISm) is recognized as an early stage of chronic obstructive pulmonary diseas. However, whether the coexistence of OSA and PRISm confers...