Jafari Dehkordi Afshin, Nasser Mohebi Abdonnaser, Heidari Soreshjani Masoumeh
Department of Clinical Science, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran;
DVM Student, Faculty of Veterinary Medicine, Shahrekord University, Shahrekord, Iran.
Vet Res Forum. 2014 Winter;5(1):1-5.
Electrocardiography (ECG) may be used to recognize cardiac disorders. Levels of milk production may change the serum electrolytes which its imbalance has a role in cardiac arrhythmia. Fifty high yielding and fifty low yielding Holstein dairy cows were used in this study. Electrocardiography was recorded by base-apex lead and blood samples were collected from jugular vein for measurement of serum elements such as sodium, potassium, calcium, phosphorous, iron and magnesium. Cardiac dysrhythmias were detected more frequent in low yielding Holstein cows (62.00%) compared to high yielding Holstein cows (46.00%). The cardiac dysrhythmias that were observed in low yielding Holstein cows included sinus arrhythmia (34.70%), wandering pacemaker (22.45 %), bradycardia (18.37%), tachycardia (10.20%), atrial premature beat (2.04%), sinoatrial block (2.04%), atrial fibrillation (8.16%) and atrial tachycardia (2.04%). The cardiac dysrhythmias were observed in high yielding Holstein cows including, sinus arrhythmia (86.95%) and wandering pacemaker (13.05%). Also, notched P wave was observed to be 30% and 14% in high- and low- yielding Holstein cows respectively. The serum calcium concentration of low yielding Holstein cows was significantly lower than that of high yielding Holstein cows. There was not any detectable significant difference in other serum elements between high- and low- yielding Holstein cows. Based on the result of present study, could be concluded that low serum concentration of calcium results to more frequent dysrhythmias in low yielding Holstein cows.
心电图（ECG）可用于识别心脏疾病。产奶量水平可能会改变血清电解质，而其失衡在心律失常中起作用。本研究使用了50头高产和50头低产的荷斯坦奶牛。通过基-尖导联记录心电图，并从颈静脉采集血样以测量血清中的钠、钾、钙、磷、铁和镁等元素。与高产荷斯坦奶牛（46.00%）相比，低产荷斯坦奶牛（62.00%）中检测到心律失常的频率更高。在低产荷斯坦奶牛中观察到的心律失常包括窦性心律失常（34.70%）、游走心律（22.45%）、心动过缓（18.37%）、心动过速（10.20%）、房性早搏（2.04%）、窦房阻滞（2.04%）、心房颤动（8.16%）和房性心动过速（2.04%）。在高产荷斯坦奶牛中观察到的心律失常包括窦性心律失常（86.95%）和游走心律（13.05%）。此外，高产和低产荷斯坦奶牛中出现切迹P波的比例分别为30%和14%。低产荷斯坦奶牛的血清钙浓度显著低于高产荷斯坦奶牛。高产和低产荷斯坦奶牛的其他血清元素之间未检测到任何显著差异。基于本研究结果，可以得出结论，低血清钙浓度导致低产荷斯坦奶牛心律失常更为频繁。
