International Journal of COPD (Sep 2016)
Myocardial performance index correlates with the BODE index and affects quality of life in COPD patients
Abstract
Daniela Graner Schuwartz Tannus-Silva,1 João Batista Masson-Silva,1 Lays Silva Ribeiro,1 Marcus Barreto Conde,2,3 Marcelo Fouad Rabahi1 1Faculty of Medicine, Federal University of Goias, Goiânia, Goiás, 2Instituto de Doenças do Tórax da Universidade Federal do Rio de Janeiro, Rio de Janeiro, 3Faculdade de Medicina de Petrópolis, Petrópolis, Rio de Janeiro, Brazil Background and objective: COPD, a systemic illness associated with the impairment of different organs, affects patient prognosis and quality of life. The aim of this study was to evaluate the association between right ventricle (RV) function, the BODE (body mass index, airflow obstruction, dyspnea, and exercise capacity) index (a multifunctional scale for the assessment of mortality risk), and quality of life in patients with COPD. Methods: A cross-sectional study was carried out in 107 outpatients presenting with stable COPD who underwent clinical assessment, spirometry, arterial blood gas analyses, a 6-minute walk test, electrocardiography, and echocardiogram and who responded to the Saint George’s Respiratory Questionnaire (SGRQ). Results: Among the study subjects, 53% (57/107) were males, and the mean age was 65.26±8.81 years. A positive correlation was observed between RV dysfunction measured by the myocardial performance index using tissue Doppler (MPIt) and the BODE index, even after adjustment for age and partial pressure of oxygen (r2=0.47; P<0.01). Patients with alterations in the MPIt had worse quality of life, and a statistically significant difference was found for different domains of the SGRQ. Patients with a normal MPIt had a mean total score of 46.2±18.6, whereas for those with MPIt alterations, the mean total score was 61.6±14.2 (P=0.005). These patients had a 1.49-fold increased risk of exhibiting SGRQ total score above the upper limit of the 95% CI (P=0.01). Conclusion: The findings of this study suggest that RV dysfunction as measured by the MPIt was associated with impairment in quality of life and a worse BODE index in COPD patients, irrespective of age and hypoxemia status. Keywords: COPD, right ventricle dysfunction, echocardiography, BODE score, quality of life
