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Índices geométricos de variabilidade da frequência cardíaca na doença pulmonar obstrutiva crônica

2011; Elsevier BV; Volume: 17; Issue: 6 Linguagem: Inglês

10.1016/j.rppneu.2011.06.007

2173-5115

Tatiana Dias de Carvalho, Carlos Marcelo Pastre, Renata Claudino Rossi, Luíz Carlos de Abreu, Vítor Engrácia Valenti, Luiz Carlos Marques Vanderlei,

Non-Invasive Vital Sign Monitoring

It was already evidenced decreased heart rate variability (HRV) in chronic obstructive pulmonary disease (COPD) patients at rest.In order to insert new elements in the literature regarding this issue, we evaluated geometric index of HRV in COPD subjects.We analyzed data from 34 volunteers, divided into two groups according to spirometric values: COPD (17 volunteers, FEV1/FVC=47.3±10.2; FEV1=50.8±15.7) and control (17 volunteers, FEV1/FVC=78.8±10.8; FEV1=100.1±14.7). For analysis of HRV indexes the volunteers remained in the supine position for 30 minutes. We analyzed the following indexes: triangular index (RRtri), triangular interpolation of RR intervals (TINN) and Poincaré plot (SD1, SD2 and SD1/SD2). Student t test for unpaired samples and Mann-Whitney test were used for data analysis.We observed statistically significant reductions in geometric indexes in the COPD group: RRtri (0.043±0.01 vs. 0.059±0.02; p=0.018), TINN (105.88±51.82 vs. 151.47±49.9; p=0.014), SD1 (9.76±4.66 vs. 14.55±6.04; p=0.014) and SD2 (34.86±17.02 vs. 51.51±18.38; p=0.010). SD1/SD2 (0.30±0.11 vs. 0.28±0.07; p=0.605) were not significantly different between groups. Patients with COPD presented a visual analysis of Poincaré plot of lower dispersion of RR intervals both beat to beat and the long term.Subjects with COPD present reduction of geometric indexes of HRV, indicating reduced heart rate variability.