Methods Inf Med - Extraction of response waveforms of heartbeat and blood pressure to swallowing. Using mixed signal processing of time domain and respiratory phase domain.

Tópicos

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Resumo

CKGROUND: Evaluating the accurate responses of the cardiovascular system to external stimuli is important for a deeper understanding of cardiovascular homeostasis. However, the responses should be distorted by the conventional time domain analysis when a frequency of the effect of external stimuli matches that of intrinsic fluctuations.OBJECTIVES: The purpose of this study is to propose a mixed signal processing of time domain and respiratory phase domain to extract the response waveforms of heartbeat and blood pressure (BP) to external stimuli and to clarify the physiological mechanisms of swallowing effects on the cardiovascular system.METHODS: Measurements were conducted on 12 healthy humans in the sitting and standing positions, with each subject requested to swallow every 30 s between expiration and inspiration. Waveforms of respiratory sinus arrhythmia (RSA) and respiratory-related BP variations were extracted as functions of the respiratory phase. Then, respiratory effects were subtracted from response waveforms with reference to the respiratory phase in the time domain.RESULTS: As a result, swallowing induced tachycardia, which peaked within 3 s and recovered within 8 s. Tachycardia was greater in the sitting position than during standing. Furthermore, systolic BP and pulse pressure immediately decreased and diastolic BP increased coincident with the occurrence of tachycardia. Subsequently, systolic BP and pulse pressure recovered faster than the R-R interval.CONCLUSIONS: We conclude that swallowing-induced tachycardia arises largely from the decrease of vagal activity and the baroreflex would yield fast oscillatory responses in recovery.

Resumo Limpo

ckground evalu accur respons cardiovascular system extern stimuli import deeper understand cardiovascular homeostasi howev respons distort convent time domain analysi frequenc effect extern stimuli match intrins fluctuationsobject purpos studi propos mix signal process time domain respiratori phase domain extract respons waveform heartbeat blood pressur bp extern stimuli clarifi physiolog mechan swallow effect cardiovascular systemmethod measur conduct healthi human sit stand posit subject request swallow everi s expir inspir waveform respiratori sinus arrhythmia rsa respiratoryrel bp variat extract function respiratori phase respiratori effect subtract respons waveform refer respiratori phase time domainresult result swallow induc tachycardia peak within s recov within s tachycardia greater sit posit stand furthermor systol bp puls pressur immedi decreas diastol bp increas coincid occurr tachycardia subsequ systol bp puls pressur recov faster rr intervalconclus conclud swallowinginduc tachycardia aris larg decreas vagal activ baroreflex yield fast oscillatori respons recoveri

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