You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Atrial fibrillation is the most common sustained arrhythmia . Because of its potentially serious clinical consequences ( heart failure , stroke , and cognitive impairment ) , atrial fibrillation has important socioeconomic and health implications . This article reviews the major studies on the epidemiology of atrial fibrillation in Spain . Recent data suggest that in people older than 40 years , the prevalence of atrial fibrillation may be more than 4% . Given the current Spanish demography , these data would imply that more than 1 million people in Spain have atrial fibrillation .
cognitive impairment