Fotopletismografia em cães: identificação dos elementos espectrais e aplicação em ambiente cirúrgico
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Data
2021
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Edições Universitárias Lusófonas
Resumo
Este estudo piloto teve como objetivos caracterizar através da fotopletismografia (FPG) a atividade cardíaca e respiratória no cão durante o período pré-cirúrgico e identificar os elementos espectrais que constituem esse sinal. A amostra em estudo incluiu quatro cães de diferentes raças, dois machos e duas fêmeas, entre os 7 meses e 6 anos de idade, submetidos a pré-medicação anestésica. O sinal de FPG foi obtido na cauda com um sensor de FPG ligado à placa hardware Bitalino (Plux, Portugal), antes e após pré-medicação com uma combinação de 5 µg/kg de dexmedetomidina e 0,35 mg/kg de metadona por via intramuscular. Os dados recolhidos foram analisados com recurso ao programa Matlab (MathWorks, EUA) e o sinal de FPG decomposto nas frequências que o constituem através da transformada de Wavelet. Posteriormente estimámos os valores máximos e mínimos das atividades cardíaca e respiratória. Encontrámos sete ondas estabelecidas em função da correspondência com as atividades cardíaca e respiratória normais do cão. Este ensaio permitiu demonstrar que a FPG é um instrumento de diagnóstico valioso para registar as frequências cardíaca e respiratória em ambiente clínico com recurso de um aparelho sem-fios. Palavras-chave: cão, frequência respiratória, frequência cardíaca, fotopletismografia, anestesia, transformada de Wavelet
This pilot study aimed to assess cardiac and respiratory activity in dogs using photopletismography (PPG) during the presurgical period and to determine the spectral elements composing the measured PPG signal. The studied sample comprised four dogs, two males and two females, ranging from 7 months to 6 years old, from different breeds under anesthetic premedication. PPG signal was obtained at the tail using a PPG sensor connected to a Bitalino hardware board (Plux, Portugal) before and after premedication with 5 µg/kg dexmedetomidine and 0.35 mg/kg methadone by intramuscular injection. The data obtained was analyzed using Matlab (MathWorks, USA) and the PPG signal decomposed into its various frequencies by the Wavelet transform. The estimated minimum and maximum values of heart and respiratory activity were then identified. Seven waves were found. Correspondence with the cardiac and respiratory activities was determined after comparing its frequency with the normal heart and respiratory frequencies in dogs. This study demonstrated that the PPG technique is a valuable diagnostic tool to record both heart and respiratory frequencies in a clinical setting using a wireless system. Keywords: dog, respiratory rate, heart rate, photoplethysmography, anesthesia, Wavelet transform
This pilot study aimed to assess cardiac and respiratory activity in dogs using photopletismography (PPG) during the presurgical period and to determine the spectral elements composing the measured PPG signal. The studied sample comprised four dogs, two males and two females, ranging from 7 months to 6 years old, from different breeds under anesthetic premedication. PPG signal was obtained at the tail using a PPG sensor connected to a Bitalino hardware board (Plux, Portugal) before and after premedication with 5 µg/kg dexmedetomidine and 0.35 mg/kg methadone by intramuscular injection. The data obtained was analyzed using Matlab (MathWorks, USA) and the PPG signal decomposed into its various frequencies by the Wavelet transform. The estimated minimum and maximum values of heart and respiratory activity were then identified. Seven waves were found. Correspondence with the cardiac and respiratory activities was determined after comparing its frequency with the normal heart and respiratory frequencies in dogs. This study demonstrated that the PPG technique is a valuable diagnostic tool to record both heart and respiratory frequencies in a clinical setting using a wireless system. Keywords: dog, respiratory rate, heart rate, photoplethysmography, anesthesia, Wavelet transform
Descrição
Biomedical and biopharmaceutical research : jornal de investigação biomédica e biofarmacêutica
Palavras-chave
MEDICINA VETERINÁRIA, CANÍDEOS, CÃES, RESPIRAÇÃO, FREQUÊNCIA CARDÍACA, FOTOPLETISMOGRAFIA, TRANSFORMADA DE WAVELET, ANESTESIA, VETERINARY MEDICINE, CANIDS, DOGS, RESPIRATION, HEART RATE, PHOTOPLETHYSMOGRAPHY, WAVELET TRANSFORM, ANESTHESIA