Comput Methods Programs Biomed - Time-frequency energy distribution of phrenic nerve discharges during aspiration reflex, cough and quiet inspiration.

Tópicos

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Resumo

Aspiration reflex (AspR) represents a specific inspiratory motor behavior expressed by short, powerful inspiratory activity without subsequent active expiration and characterized by the ability to interrupt strong tonic inspiratory activity, as well as hypoxic apnea and several other functional disorders. Multiresolution analysis-based determination of spectral features arising during AspR has not yet been satisfactorily investigated. The time-frequency energy distribution of phrenic nerve electrical activity was compared during the AspR, inspiratory phase of tracheobronchial cough and quiet inspiration. Data obtained from 16 adult cats anesthetized with chloralose or pentobarbital were analyzed using a wavelet transformation, a sensitive method suitable for processing of the non-stationary respiratory output signal. Phrenic nerve energy was accumulated within lower frequency bands in AspR bursts. In AspR, higher frequencies contributed less to the total power, when compared to cough inspiration. Moreover, AspR indicated a stable time-frequency energy distribution, regardless of which of the two types of anesthesia were used. Chloralose anesthesia induced a decrease of parameters in cough and quiet inspiration related to the quantity of energy. The results indicate a specific method of information processing during generation of AspR, underlying its powerful ability to influence various severe functional disorders with potential implications for model experiments and clinical practice.

Resumo Limpo

aspir reflex aspr repres specif inspiratori motor behavior express short power inspiratori activ without subsequ activ expir character abil interrupt strong tonic inspiratori activ well hypox apnea sever function disord multiresolut analysisbas determin spectral featur aris aspr yet satisfactorili investig timefrequ energi distribut phrenic nerv electr activ compar aspr inspiratori phase tracheobronchi cough quiet inspir data obtain adult cat anesthet chloralos pentobarbit analyz use wavelet transform sensit method suitabl process nonstationari respiratori output signal phrenic nerv energi accumul within lower frequenc band aspr burst aspr higher frequenc contribut less total power compar cough inspir moreov aspr indic stabl timefrequ energi distribut regardless two type anesthesia use chloralos anesthesia induc decreas paramet cough quiet inspir relat quantiti energi result indic specif method inform process generat aspr under power abil influenc various sever function disord potenti implic model experi clinic practic

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