Med Biol Eng Comput - Time delay correction of the synchrogram for optimized detection of cardiorespiratory coordination.

Tópicos

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Resumo

The cardiorespiratory synchrogram, a graphical tool based on the stroboscopic technique, is an established method for evaluating phase-locking between cardiac and respiratory oscillators. In the original method, the phase of the respiratory oscillator is observed at the instants of time when the phase of the cardiac oscillator attains a certain value. In this article, we introduced an additional adaptive delay in the cardiac oscillator based on the maximisation of the cross-correlation or symbolic coupling traces between the phases of respiration and the delayed R-R intervals. We then investigated phase coordination in thirteen normal subjects (five males, eight females; age: 19-24 years) for different body postures. Cardiorespiratory coordination was observed to be significantly reduced in the upright position (supine vs. upright: 11.9 ? 5.1 vs. 6.9 ? 3.6, P < 0.05). Compared to the original algorithm we observed an increase in the detection of average cardiorespiratory coordination (supine original vs. delay: 11.9 vs. 18.9%), together with a decrease in standard deviation of the percentage of coordination in all the subjects, after introducing the heart rate delay (supine original vs. delay: 5.1 vs. 4.4%). In conclusion, the performance of the synchrogram technique was improved by including an adaptive delay in the cardiac oscillator.

Resumo Limpo

cardiorespiratori synchrogram graphic tool base stroboscop techniqu establish method evalu phaselock cardiac respiratori oscil origin method phase respiratori oscil observ instant time phase cardiac oscil attain certain valu articl introduc addit adapt delay cardiac oscil base maximis crosscorrel symbol coupl trace phase respir delay rr interv investig phase coordin thirteen normal subject five male eight femal age year differ bodi postur cardiorespiratori coordin observ signific reduc upright posit supin vs upright vs p compar origin algorithm observ increas detect averag cardiorespiratori coordin supin origin vs delay vs togeth decreas standard deviat percentag coordin subject introduc heart rate delay supin origin vs delay vs conclus perform synchrogram techniqu improv includ adapt delay cardiac oscil

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