Determination of heart rate and heart rate variability in the equine fetus by fetomaternal electrocardiography

Theriogenology
C NagelC Aurich

Abstract

Heart rate is an important parameter of fetal well-being. We have analyzed fetal heart rate (HR) and heart rate variability (HRV) by fetomaternal electrocardiography (ECG) in the horse (Equus caballus) from midpregnancy to foaling. It was the aim of the study to detect changes in the regulation of fetal cardiac activity over time and to establish normal values in undisturbed pregnancies. A total of 22 mares were available for the study. Fetomaternal electrocardiography was a reliable technique to detect cardiac signals in fetuses between Day 173 of gestation and foaling. Fetal HR decreased from 115+/-4 beats/min (Days 170 to 240 of gestation) to 83+/-3 beats/min (Day 320) to 79+/-1 beats/min (1 d before foaling; P<0.001). Mean beat to beat (RR) interval and standard deviation of the RR interval (SDRR) increased (P<0.001). Gestational age thus affects RR interval and HR in the equine fetus. From Days 270 to 340 of gestation, SDRR increased from 11.4+/-1.3 msec on Day 270 to 27.8+/-3.6 msec on Day 340 (P<0.05), and the root mean square of successive RR differences (RMSSD) tended to increase (P=0.07), indicating maturation of the fetal autonomous nervous system. For the last 10 d before foaling, fetal HR and HRV remained constant ...Continue Reading

References

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Citations

Mar 26, 2014·The Journal of Veterinary Medical Science·Harutaka MuraseYasuo Nambo
Feb 10, 2016·Journal of Equine Science·Harutaka MuraseYasuo Nambo
Sep 13, 2011·Animal Reproduction Science·Christina NagelChristine Aurich
Mar 9, 2011·Reproduction in Domestic Animals = Zuchthygiene·C NagelC Aurich
Feb 7, 2015·Acta Veterinaria Hungarica·Boglárka Baska-VinczeOttó Szenci
Jun 18, 2016·Theriogenology·Christina NagelChristine Aurich
Jan 25, 2017·Journal of Veterinary Cardiology : the Official Journal of the European Society of Veterinary Cardiology·B H Eggensperger, C C Schwarzwald
Jul 31, 2018·Reproduction in Domestic Animals = Zuchthygiene·Constanze HartmannChristina Nagel
Nov 17, 2020·The Journal of Veterinary Medical Science·Amanda Sarita Cruz-AleixoMaria Lucia Gomes LourenÇo
Feb 24, 2020·Theriogenology·Christina NagelChristine Aurich
Jan 21, 2021·The Veterinary Journal·Katharyn J Mitchell, Colin C Schwarzwald

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