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espanolResumen No existen estudios que correlacionen electrolitos con la frecuencia cardiaca (FC) y la variabilidad de la frecuencia cardiaca (VFC) en el periparto de vacas. En teoria las concentraciones de electrolitos en suero pueden afectar la VFC directamente al influir sobre la excitabilidad del musculo cardiaco. Se estudiaron 23 vacas de la raza holstein. Los indices de VFC se analizaron en seis momentos mediante la electrocardiografia. Se evaluaron los indices en el metodo del dominio del tiempo y frecuencia, desviacion estandar de las diferencias entre latidos consecutivos (SDNN), raiz cuadrada del promedio de las diferencias entre intervalos sucesivos elevadas al cuadrado (RMSSD), baja frecuencia (LF) y alta frecuencia (HF), asi como la relacion LF/HF. Se midieron las concentraciones de Ca2+, Mg2+ y Pi por medio de espectrofotometria y Na+ y K+ mediante fotometria. La FC aumento en el dia antes del parto y luego disminuyo despues del parto. Los indices parasimpaticos de RMSSD y HF aumentaron. El indice simpatovagal de relacion LF/HF disminuyo significativamente. Las concentraciones de los electrolitos Ca2+ y Pi disminuyeron despues del parto mientras el Na+ aumento. El dia antes del parto el indice LF aumento, mientras que la HF disminuyo, lo que indica la modulacion de la FC y la ventilacion por el nervio vago. El K+ un dia antes del parto mostro una fuerte asociacion con el indice de HF. El dia despues del parto la correlacion entre el K y la FC, HF y LF mostro una fuerte asociacion. EnglishAbstract There are no studies that correlate electrolytes with heart rate (HR) and heart rate variability (HRV) during the peripartum period in cows. In theory, electrolyte concentrations in serum can directly affect HRV by influencing the excitability of the heart muscle. Twenty-three cows of the Holstein breed were studied. HRV indexes were analyzed in six moments by electrocardiography. The indices were evaluated in the time domain and frequency, standard deviation of successive intervals (SDNN), root mean square of the average difference of successive intervals (RMSSD), low frequency (LF), and high frequency (HF), as well as the LF/HF ratio. Ca2+, Mg2+, and Pi concentrations were measured by means of spectrophotometry, as well as concentrations of Na+ and K+ by means of photometry. HR increased on the day before delivery and then decreased after delivery. The parasympathetic indices of RMSSD and HF increased. The sympathovagal balance between LF/HF decreased significantly. Concentrations of the electrolytes Ca2+ and Pi decreased after delivery, while Na+ concentration increased. The day before delivery, the LF index increased, while HF decreased, indicating HR modulation and ventilation via the vagus nerve. One day before delivery, K+ showed a strong association with the HF index. The day after delivery, the correlation between K+ and HR, HF, and LF showed a strong association. portuguesResumo Nao ha estudos que correlacionem eletrolitos com frequencia cardiaca (FC) e variabilidade da frequencia cardiaca (VFC) no periparto de vacas. Em teoria, as concentracoes de eletrolitos em soro podem afetar a VFC diretamente ao influenciar a excitabilidade do musculo cardiaco. Estudaram-se 23 vacas da raca holstein. Os indices de VFC foram analisados em seis momentos mediante a eletrocardiografia. Avaliaram-se os indices no metodo de dominio do tempo e frequencia, desvio padrao das diferencas entre batimentos consecutivos (SDNN), raiz quadrada da media das diferencas entre intervalos sucessivos elevadas ao quadrado (RMSSD), baixa frequencia (LF) e alta frequencia (HF), bem como a relacao LF/HF. As concentracoes de Ca2+, Mg2+ e Pi foram medidas por espectrofotometria, e Na+ e K+ por fotometria. A FC aumentou no dia antes do parto e logo diminuiu apos o parto. Os indices parassimpaticos de RMSSD e HF aumentaram. O indice simpatovagal de relacao LF/HF diminuiu significativamente. As concentracoes dos eletrolitos Ca2+ e Pi diminuiram apos o parto entanto o Na+ aumentou. O dia antes do parto o indice LF aumentou, enquanto que a HF diminuiu, o que indica a modulacao da FC e a ventilacao pelo nervo vago. O K+ um dia antes do parto mostrou forte associacao com o indice de HF. O dia apos o parto a correlacao entre o K e a FC, HF e LF mostrou forte associacao.

Electrolitos, frecuencia cardiaca y variabilidad de la frecuencia cardiaca en el periparto de vacas holstein