Med Biol Eng Comput - Fluctuation analysis of respiratory impedance waveform in asthmatic patients: effect of airway obstruction.

Tópicos

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Resumo

Fluctuation analysis has great potential to contribute to pulmonary clinical science and practice. We evaluated the relationship between asthma and the respiratory impedance recurrence period density entropy (RPDEnZrs) and the variability (SDZrs). A non-invasive and simple protocol for assessing respiratory mechanics during spontaneous breathing was used in a group of 74 subjects with various levels of airway obstruction. Airway obstruction resulted in a reduction in the RPDEnZrs that was significantly correlated with both spirometric indices of airway obstruction (R = 0.48, p < 0.0001) and mean respiratory impedance (R = -0.83, p < 0.0001). These results suggest that the impedance pattern becomes less complex in asthmatic patients, which may explain the reduction in respiratory systems' adaptability to daily life activities. Preliminary evaluations indicate that RPDEnZrs may contribute to the asthma diagnosis, presenting accuracies of 82 and 87 % in patients with moderate and severe airway obstruction, respectively. On the other hand, SDZrs increased with obstruction (p < 0.0001) and was inversely correlated with spirometric indices of obstruction (R = -0.42, p = 0.0003) and directly associated with mean impedance (R = 0.88, p < 0.0001). This analysis contributes to elucidate previous studies and identified respiratory changes in patients with moderate and severe obstruction with an adequate accuracy (85 and 87 %, respectively).

Resumo Limpo

fluctuat analysi great potenti contribut pulmonari clinic scienc practic evalu relationship asthma respiratori imped recurr period densiti entropi rpdenzr variabl sdzrs noninvas simpl protocol assess respiratori mechan spontan breath use group subject various level airway obstruct airway obstruct result reduct rpdenzr signific correl spirometr indic airway obstruct r p mean respiratori imped r p result suggest imped pattern becom less complex asthmat patient may explain reduct respiratori system adapt daili life activ preliminari evalu indic rpdenzr may contribut asthma diagnosi present accuraci patient moder sever airway obstruct respect hand sdzrs increas obstruct p invers correl spirometr indic obstruct r p direct associ mean imped r p analysi contribut elucid previous studi identifi respiratori chang patient moder sever obstruct adequ accuraci respect

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