[Importance of fatigue, sleep quality and mood in patients with chronic obstructive pulmonary disease and the need for measurement instruments].

The effect of chronic obstructive pulmonary disease (COPD) on patients and their perception of wellbeing goes beyond functional respiratory alterations. Fatigue, mood and sleep alterations constitute a complex of interrelated symptoms affecting perception of health status. Fatigue is a highly important symptom due to its frequency, clinical repercussions and association with other manifestations. Functional alterations during sleep are of various degrees of severity and are most important in sleep apnea-hypopnea syndrome. Mood alterations are important because of their frequency, clinical repercussion and prognostic implications. In the last few years, several measurement instruments have been developed to quantify these manifestations, such as the Living with COPD scale (LCOPD), the COPD and Asthma Fatigue Scale (CAFS) and the COPD and Asthma Sleep Impact Scale (CASIS).The present article reviews the clinical relevance of these manifestations and the measurement instruments available for their evaluation.