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Online Journal of Veterinary Research©
Volume 24 (6):338-342, 2020.
Electrocardiograms in lambs with foot and mouth disease.
Aliasghar Chalmeh*, Ali Rezakhani, Mehrdad Pourjafar, Mohammad Mazrouei Sebdani
Department of Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran
Chalmeh A, Rezakhani A, Pourjafar M, Sebdani MM., Electrocardiograms in lambs with foot and mouth disease, Onl J Vet Res., 24 (6):338-342, 2020. High mortality in lambs with FMD is associated with acute myocarditis. We report electrocardiograms (ECG) in lambs with foot and mouth (FMD) infection. Lambs had high mortality but adults in same flocks exhibited lameness with oral ulcers. Lambs were fevered (~40°C) with tachycardia (~200 beats/min.) tachypnea (~80/min) suffering sudden death. Necropsy revealed gray yellow cardiac streaking with necrosis of myocardium. Based on findings we diagnosed FMD. ECG’s were recorded on bipolar base apex limb lead with lambs standing without sedation and minimum restraint. Positive left arm electrodes were placed over cardiac apex on the 5th left intercostal space at the level of the elbow, right arm negative electrode on the left jugular furrow at the top of heart base, and neutral electrode on dorsal spine recorded in a single channel. Lambs showed no clinical signs of cardiovascular insufficiencies such as edema and jugular distension or pulsation. Rate, rhythm and amplitude of heart sounds and amplitude of the peripheral pulse varied significantly. ECG showed no P waves, multiple f waves nor irregular R-R intervals. However we recorded atrial fibrillation and reduced ST-segments probably due to myocarditis, fever, starvation, electrolyte imbalances, tachycardia and poor myocardial blood flow.
Key words: Foot and mouth disease, Cardiac arrhythmia, Atrial fibrillation, ST-segment depression, Lamb.