{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T06:26:25Z","timestamp":1787639185890,"version":"build-2736575974"},"reference-count":42,"publisher":"American Veterinary Medical Association (AVMA)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ajvr"],"published-print":{"date-parts":[[2004,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Objective<\/jats:bold>\u2014To compare abomasal luminal gas pressure\nand volume and perfusion of the abomasum in\ndairy cows with a left displaced abomasum (LDA) or\nabomasal volvulus (AV).<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Animals<\/jats:bold>\u201440 lactating dairy cows (25 with an LDA\nand 15 with an AV).<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Procedure<\/jats:bold>\u2014Abomasal luminal gas pressure and volume\nand pulse oximetry values for the caudal portion\nof the dorsal ruminal sac and abomasal wall were\nmeasured during laparotomy. Abomasal perfusion\nwas assessed on the basis of abomasal O<jats:sub>2<\/jats:sub> saturation\n(pulse oximetry) before correction of the LDA or AV.\nAbomasal perfusion was also assessed after correction\nof the LDA or AV by measuring venous O<jats:sub>2<\/jats:sub> saturation\nin the right gastroepiploic vein and calculating\nthe abomasal oxygen-extraction ratio.<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Results<\/jats:bold>\u2014Abomasal luminal gas pressure and volume\nwere higher in cattle with an AV than in cattle with an\nLDA. Abomasal O<jats:sub>2<\/jats:sub> saturation was lower and abomasal\noxygen-extraction ratio higher in cattle with an AV,\ncompared with values in cattle with an LDA. In cows\nwith an AV, lactate concentration in the gastroepiploic\nvein was greater than that in a jugular vein, whereas\nno difference in lactate concentrations was detected\nin cows with an LDA. Abomasal luminal gas pressure\nwas positively correlated ( <jats:italic>r<\/jats:italic>, 0.51) with plasma lactate\nconcentration in the gastroepiploic vein and negatively\ncorrelated ( <jats:italic>r<\/jats:italic>, \u20130.32) with abomasal O<jats:sub>2<\/jats:sub> saturation\ndetermined by use of pulse oximetry.<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Conclusions and Clinical Relevance<\/jats:bold>\u2014Abomasal\nperfusion decreases as luminal pressure increases in\ncattle with an AV or LDA. 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