Littlejohn, A.Bowles, FelicityMaluleka, W.Bigalke, R.D.Cameron, Colin McKenzieGilchrist, Frances M.C.Jordaan, E.Morren, A.J.Verster, Anna J.M.Verwoerd, Daniel WynandWalker, Jane B.Steyn, P.J.J.2016-03-022016-03-0220151982Littlejohn, A, Bowles, F & Maluleka, W 1982, 'Studies on the physiopathology of chronic obstructive pulmonary disease in the horse. VII. Percentage venous admixture’, Onderstepoort Journal of Veterinary Research, vol. 49, no. 4, pp. 211-214.0330-2465http://hdl.handle.net/2263/51650The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.The percentage venous admixture was calculated in 21 clinically normal horses and ponies and in 13 horses and ponies with chronic obstructure pulmonary disease (COPD). The oxygen contents of pulmonary end-capillary blood, arterial and mixed venous blood were calculated from blood and respiratory gas values and substituted in the shunt equation. The mean percentage venous admixture of the COPD subjects was significantly greater than that of the normal subjects. It was concluded that a larger proportion of alveoli in the lungs of COPD subjects were hypoventilated than that of alveoli of the normal lungs.en©ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). ©University of Pretoria. Dept. of Library Services (digital).Veterinary medicineVeterinary medicine -- South AfricaArticle