effect of patients' depression and anxiety on quality of life in chronic obstructive pulmonary disease (copd): literature review
The World Health Organisation (WHO) was estimated that 65 million people have moderate o severe chronic obstructive pulmonary disease (COPD). WHO was stated that more than 3 million people died of COPD in 2005 that corresponds to 5% of all deaths globally. COPD is characterised by airflow obstruction. The airflow obstruction is usually progressive, not fully reversible and does not change markedly over several months.