10th Annual European College of Equine Internal Medicine Congress: 2—4 November, 2017

Methods: Complete computerized heparinized venous blood gases, electrolytes and total proteins [TP] (g/L) of 30 diarrheic horses with normal pH (7.41 6 0.03), PCO 2 (42 6 4.5 mmHg), and Base excess (BE) (1-7 mM/L) were recorded. AB disorders in horses were defined when variables were outside of the following reference ranges: Base excess (1-7 mM/L), [HCO 3 ] (24-34 mM/L), AG (<16 mM/L); strong ion difference (SID) 5 [(Na 1 1 K 1 ) 2 (Cl 2 1 L-Lactate 2 )] (38-47 mM/L), total concentration of non-volatile buffers (A tot ) 5 0.22 3 TP (g/L) (11-16 mM/L), and Unmeasured Strong Anions (USA) 5 A tot /1 1 10 (6.65-pH) 2 SID 2 HCO 2 3 (22 to 3 mM/L). Results: Of the 30 horses included, 47% (14/30) had SID AB disorders. Single metabolic AB disorders identified in diarrheic horses included strong ion acidosis (6/14; 43%) and USA acidosis (1/14; 7%). Detected mixed metabolic AB disorders were SID acidosis and A tot alkalosis (5/14; 36%), and USA acidosis and A tot alkalosis (1/14; 7%).