Nelson D R, Petersen G C, Huhn J C, Olson W A
Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana 61801, USA.
Zentralbl Veterinarmed A. 1995 Jul;42(5):325-37. doi: 10.1111/j.1439-0442.1995.tb00384.x.
Electromyographic (EMG) recordings of the reticulum, abomasal corpus, pyloric antrum and duodenum of six dairy cows with left displacement of the abomasum (LDA) were made in order to substantiate abomasal atony as a prerequisite to abomasal displacement. EMG recordings were made when LDA was present as well as when absent. Mean values were determined in five of six cows for the maximum peak or amplitude, mean peak values, peak-to-peak interval and count of the electrical response activity (ERA) for each 15 min segment of the waveform recordings. Segments containing phase III migrating myoelectric activity were not analysed. LDA positive periods were compared to LDA negative periods in each cow. The 6 h period (transition period) prior to the diagnosis of LDA was analysed separately. Paired t-tests were applied to group values with statistical significance established at the P = 0.05 level. There was a significant decrease in the ERA count during the LDA positive periods in the abomasal corpus (-1.40% to -7.88%, P = 0.0217) and in the pyloric antrum (-2.05% to -11.98%, P = 0.0430). A corresponding significant increase occurred in the peak-to-peak interval. During the transition period spike activity in the duodenum increased 0.5% to 48.31% (P = 0.0474) and the peak-to-peak interval was significantly decreased. No extended periods of atony were observed in the abomasum during this study.
为了证实真胃弛缓是真胃移位的一个先决条件，对6头患真胃左方移位（LDA）的奶牛的网胃、真胃体、幽门窦和十二指肠进行了肌电图（EMG）记录。在存在和不存在LDA的情况下均进行了EMG记录。对6头奶牛中的5头，测定了波形记录中每15分钟段的最大峰值或振幅、平均峰值、峰间间隔和电反应活动（ERA）计数的平均值。未分析包含Ⅲ期移行性肌电活动的节段。比较了每头奶牛LDA阳性期和LDA阴性期。对LDA诊断前6小时的时间段（过渡期）进行了单独分析。采用配对t检验对组值进行分析，在P = 0.05水平确定统计学显著性。在LDA阳性期，真胃体的ERA计数显著下降（-1.40%至-7.88%，P = 0.0217），幽门窦的ERA计数也显著下降（-2.05%至-11.98%，P = 0.0430）。峰间间隔相应显著增加。在过渡期，十二指肠的棘波活动增加了0.5%至48.31%（P = 0.0474），峰间间隔显著缩短。在本研究中，未观察到真胃有长时间的弛缓情况。
