Estudo retrospectivo e prospectivo da relação alométrica entre frequência cardíaca, parâmetros eletrocardiográficos e peso corporal em cães
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Data
2016-12-12
Autores
Aleixo, Amanda Sarita Cruz [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A relação alométrica entre frequência cardíaca (FC) e peso corporal, postulada há anos, vem sendo refutada. Estudos acerca da variação e influência de fatores sobre parâmetros hemodinâmicos e eletrocardiográficos em cães não são abundantes. O escopo deste estudo foi avaliar a relação entre FC e peso corporal em cães, bem como a influência do peso sobre os parâmetros eletrocardiográficos (ECG). Foi realizado um estudo retrospectivo (1) mediante a análise da relação entre FC, parâmetros eletrocardiográficos e peso corporal através de traçados de ECG armazenados pelo Serviço de Cardiologiadurante os anos de 2012-2013;já no estudoprospectivo (2) – utilizou-se a eletrocardiografia e o exame de Holter para análise da variabilidade da frequência cardíaca e determinação das variáveis clínicas: peso corporal, idade, raça, sexo, temperamento, frequência respiratória (FR), temperatura corporal, pressão arterial sistêmica e dosagem séricade adrenalina e noradrenalina, dividindo-se os cães em cinco grupos de peso: < 5 kg (8), 5-10 (10), 10-25 (10), 25-45 (10) e > 45 kg (10). As variáveis do ECG variaram conforme o peso. A amplitude da onda R foi maior em cães com idade acima de cinco anos. A concentração de adrenalina aumentou conforme aumento do peso corporal. A FC foi maior no grupo de animais nervosos e a FR foi maior no grupo de animais agitados. As correlações obtidas entre FC e peso e FC e ASC foram fracas. Não houve diferença entre os índices do Holter entre os grupos de pesos.Não existe relação alométrica entre FC e peso corporal em cães. Existe uma relação diretamente proporcional entre adrenalina e peso em cães. O temperamento altera os parâmetros clínicos FC e FR. O peso influencia as variáveis eletrocardiográficas. A análise da FC deve ser realizada considerando-se patamares (direcionada ao metabolismo energético, segundo a faixa etária, sexo e temperamento).
The allometric relationship between heart rate (HR) and body weight, posited for years, has been refuted. Studies on the variation and influence of several factors on the hemodynamic and electrocardiographic parameters in dogs are not plentiful. The scope of this study was to evaluate the relationship between HR and body weight in healthy dogs, as well as the influence of the weight on the electrocardiographic parameters (ECG). We conducted a retrospective study (1) by means of the analysis of the relationship between HR, electrocardiographic parameters and body weight in ECG tracings stored by cardiology department during the years 2012-2013; prospective study (2)analyzing the ambulatory electrocardiogram and by Holter method for analysis of heart rate variability and clinical variables measurement: body weight, age, breed, gender, temperament, breath rate (BR), body temperature and blood pressure, and dosage of serum catecholamines epinephrine and norepinephrine, into five groups of dogs divided according to different weight ranges: < 5 kg (8), 5-10 (10), 10-25 (10), 25-45 (10) e > 45 kg (10). The ECG variables varied according to weight. The amplitude of the R wave was higher in dogs above five years. The epinephrine concentration increased as body weight increased. HR was higher in the group of nervous animals and BR was higher in the group with agitated animals. The correlations between HR and weight and HR and body surface area were weak. There was no difference between the Holter indices among the weight groups. There is no allometric relationship between HR and body weight in dogs. There is a directly proportional relationship between epinephrine and weight in dogs. Temperament changes the clinical parameters HR and BR. The weight influences the electrocardiographic variables. The HR analysis should be performed considering levels (directed to energy metabolism, according to age, gender and temperament).
The allometric relationship between heart rate (HR) and body weight, posited for years, has been refuted. Studies on the variation and influence of several factors on the hemodynamic and electrocardiographic parameters in dogs are not plentiful. The scope of this study was to evaluate the relationship between HR and body weight in healthy dogs, as well as the influence of the weight on the electrocardiographic parameters (ECG). We conducted a retrospective study (1) by means of the analysis of the relationship between HR, electrocardiographic parameters and body weight in ECG tracings stored by cardiology department during the years 2012-2013; prospective study (2)analyzing the ambulatory electrocardiogram and by Holter method for analysis of heart rate variability and clinical variables measurement: body weight, age, breed, gender, temperament, breath rate (BR), body temperature and blood pressure, and dosage of serum catecholamines epinephrine and norepinephrine, into five groups of dogs divided according to different weight ranges: < 5 kg (8), 5-10 (10), 10-25 (10), 25-45 (10) e > 45 kg (10). The ECG variables varied according to weight. The amplitude of the R wave was higher in dogs above five years. The epinephrine concentration increased as body weight increased. HR was higher in the group of nervous animals and BR was higher in the group with agitated animals. The correlations between HR and weight and HR and body surface area were weak. There was no difference between the Holter indices among the weight groups. There is no allometric relationship between HR and body weight in dogs. There is a directly proportional relationship between epinephrine and weight in dogs. Temperament changes the clinical parameters HR and BR. The weight influences the electrocardiographic variables. The HR analysis should be performed considering levels (directed to energy metabolism, according to age, gender and temperament).
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Palavras-chave
Variabilidade da frequência cardíaca, Cão, Temperamento, Holter, Alometria, Heart rate variability, Dog, Temperament, Allometry