Comput. Biol. Med. - Quantification of the acute effect of a low dose of red wine by nonlinear measures of RR and QT interval series in healthy subjects.


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The measures of nonlinear properties of RR interval and QT interval time series are sensitive to physiologically- or pathologically-induced complexity/regularity changes, but were not used to estimate the effect of alcohol intake. We wanted to examine the potential of these measures to quantify the acute effect of a low dose of red wine in healthy subjects. In separate experiments, fourteen young volunteers drank 200ml of red wine and a control drink with equal concentration of ethanol. ECG in supine position was recorded 20min before and 60min after drink intake. RR interval and QT interval series were extracted from ECG and we calculated variability, scaling exponents (a1 and a2) and sample entropy (SampEn) for both series. Systolic and diastolic blood pressures (BP) were measured every 10min. The immediate effect of both the drinks was equal: HR, BP and QT variability exhibited a sudden increase and then a decrease. However, the prolonged effect of wine and the control drink was different. Wine decreased both BP (p<0.05) and reduced complexity of RR and QT series (increased scaling exponents and decreased SampEn). The control drink prolonged QT and RR intervals (p<0.05). These results point out that the nonlinear properties of RR and QT interval series could be used to differentiate the effect of wine and ethanol. Changes in RR and QT interval series induced by a low dose of red wine are more detectable by methods that quantify the structure of the series than by methods that quantify their variability.

Resumo Limpo

measur nonlinear properti rr interv qt interv time seri sensit physiolog pathologicallyinduc complexityregular chang use estim effect alcohol intak want examin potenti measur quantifi acut effect low dose red wine healthi subject separ experi fourteen young volunt drank ml red wine control drink equal concentr ethanol ecg supin posit record min min drink intak rr interv qt interv seri extract ecg calcul variabl scale expon sampl entropi sampen seri systol diastol blood pressur bp measur everi min immedi effect drink equal hr bp qt variabl exhibit sudden increas decreas howev prolong effect wine control drink differ wine decreas bp p reduc complex rr qt seri increas scale expon decreas sampen control drink prolong qt rr interv p result point nonlinear properti rr qt interv seri use differenti effect wine ethanol chang rr qt interv seri induc low dose red wine detect method quantifi structur seri method quantifi variabl

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