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The severity of acid-base disturbances in diarrhoeic calves was investigated and a simple, inexpensive method of monitoring them was evaluated. The Harleco apparatus measures the 'total carbon dioxide' in a blood sample, mostly generated from the bicarbonate present, and any abnormalities are mainly due to metabolic acidosis or alkalosis. Its performance was tested against a standard blood gas analyser by comparing the results obtained by both methods with nearly 2000 blood samples from healthy or diarrhoeic calves. After technical modifications, the technique gave excellent precision and accuracy for the clinical evaluation of acid-base balance, using venous whole blood. The samples were very stable, especially at 0 degrees C, but also at room temperature. The normal range (mean +/- 1.96 sd) for total carbon dioxide in whole blood from calves was 21 to 28 mmol/litre. For samples corresponding to mild, moderate or severe acidosis, 79 per cent were correctly classified by the Harleco apparatus and only 0.1 per cent were beyond the adjacent degree of severity. After four days of diarrhoea, the calves which later died had twice the deficit in plasma bicarbonate of those which survived. As death approached, the deficit was almost three times that in surviving calves and the blood pH shortly before death was as low as 6.79 +/- 0.08. The Harleco apparatus was less successful with alkalotic samples, but metabolic alkalosis is less common and usually less severe.
Vet Rec 1990 Jan 13
PMID:Evaluation of acid-base disturbances in calf diarrhoea. 231 71

The records of 14 cases of bovine hypokalaemia observed between 1983 and 1996 were reviewed. The most common history included a protracted, often infectious, disease. All age groups were represented. Although previously reported as a risk factor, isoflupredone acetate had not been administered to five of the cases. The following clinical signs were recorded in 10 cases: abnormal position of the head and neck, severe weakness, rumen hypomotility or atony, abnormal faeces, anorexia and tachycardia. Cardiac dysrhythmia was observed in six cases. Acid-base imbalance (alkalosis in 10 cases), hyperglycaemia and increased activities of aspartate aminotransferase and creatine kinase were associated with hypokalaemia ranging from 1.35 to 2.49 mmol/litre. Treatments included symptomatic treatment, supportive care and potassium chloride given intravenously and orally at an average total daily dose of 42 g/100 kg bodyweight (26 g by mouth and 16 g intravenously) for an average of five days. Eleven cases recovered after an average of three days.
Vet Rec 1998 Oct 31
PMID:Description of 14 cases of bovine hypokalaemia syndrome. 983 71