Estudo da variabilidade da frequência cardíaca materna, fetal e neonatal em bubalinos da raça Murrah
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Data
2019-07-25
Autores
Abreu, Hudson Felipe Porto de
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Universidade Estadual Paulista (Unesp)
Resumo
A bubalinocultura tem assumido cada vez mais importância econômica devido às suas características zootécnicas como a rusticidade e melhor qualidade do leite para a fabricação de derivados lácteos quando comparada ao leite de vaca. A morte embrionária e fetal é um importante fator de diminuição da eficiência reprodutiva pois aumenta o intervalo entre partos e causa perdas econômicas pela diminuição da lactação. O eletrocardiograma materno-fetal permite a avaliação da frequência cardíaca fetal (FCF) e variabilidade da frequência cardíaca (VFC) mediante análise de indicadores da VFC (HR, RR, RMSSD, SDNN, LF, HF e a relação LF/HF). Foram avaliadas semanalmente nove búfalas e neonatos saudáveis da raça murrah, nos momentos -28, -21, -14, -7 dias antes do parto e nos dias 7, 14, 21 e 28 dias após o parto. Nas búfalas foi observada diferença significativa na frequência cardíaca na fase pré-parto e com diminuição gradual conforme proximidade do parto. Já os índices RMSSD e SDNN não apresentaram diferença significativa mas demonstraram predomínio parassimpático. O componente de baixa frequência (LF) apresentou aumento significativo na fase pré-parto e o componente de alta frequência (HF) apresentou diminuição significativa, compatível com predomínio simpático. Embora não significativa, a relação LF/HF apresentou aumento na fase pré-parto e equilíbrio vagal pós-parto. Já os bezerros apresentaram variação significativa na fase pré-parto, com aumento gradativo conforme a proximidade deste, com posterior queda pósparto. Já os índices LF e HF apresentaram aumento com proximidade do parto e diminuição após este, que pode ser causada pelo estímulo vagal devido à respiração
Bubalinoculture has become increasingly important economically due to its zootechnical characteristics such as the rusticity and better quality of milk for the manufacture of dairy products when compared to cow's milk. Embryonic and fetal death is an important factor in decreasing reproductive efficiency because it increases the interval between births and causes economic losses due to decreased lactation. The maternal-fetal electrocardiogram allows the assessment of fetal heart rate (HRF) and heart rate variability (HRV) by analyzing HRV indicators (HR, RR, RMSSD, SDNN, LF, HF and the LF / HF ratio). Nine murrah buffaloes and healthy newborns were evaluated weekly at -28, -21, -14, -7 days before delivery and at 7, 14, 21 and 28 days after delivery. In buffaloes, a significant difference in heart rate was observed in the pre-partum phase and with a gradual decrease as the childbirth approached. The RMSSD and SDNN indices did not present significant difference but showed a parasympathetic predominance. The low frequency component (LF) showed a significant increase in the prepartum phase and the high frequency component (HF) showed a significant decrease, compatible with sympathetic predominance. Although not significant, the LF / HF ratio showed an increase in the prepartum phase and postpartum vagal balance. Calves, on the other hand, presented significant variation in the pre-partum phase, with gradual increase according to its proximity, with subsequent postpartum fall. The LF and HF indices, however, increased with proximity of delivery and decreased after delivery, which may be caused by vagal stimulation due to breathing.
Bubalinoculture has become increasingly important economically due to its zootechnical characteristics such as the rusticity and better quality of milk for the manufacture of dairy products when compared to cow's milk. Embryonic and fetal death is an important factor in decreasing reproductive efficiency because it increases the interval between births and causes economic losses due to decreased lactation. The maternal-fetal electrocardiogram allows the assessment of fetal heart rate (HRF) and heart rate variability (HRV) by analyzing HRV indicators (HR, RR, RMSSD, SDNN, LF, HF and the LF / HF ratio). Nine murrah buffaloes and healthy newborns were evaluated weekly at -28, -21, -14, -7 days before delivery and at 7, 14, 21 and 28 days after delivery. In buffaloes, a significant difference in heart rate was observed in the pre-partum phase and with a gradual decrease as the childbirth approached. The RMSSD and SDNN indices did not present significant difference but showed a parasympathetic predominance. The low frequency component (LF) showed a significant increase in the prepartum phase and the high frequency component (HF) showed a significant decrease, compatible with sympathetic predominance. Although not significant, the LF / HF ratio showed an increase in the prepartum phase and postpartum vagal balance. Calves, on the other hand, presented significant variation in the pre-partum phase, with gradual increase according to its proximity, with subsequent postpartum fall. The LF and HF indices, however, increased with proximity of delivery and decreased after delivery, which may be caused by vagal stimulation due to breathing.
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búfalos, eletrocardiograma, neonatologia, cardiologia, bubalinoculture, Cardiology, neonatology, variability