Abstract
Summary Right-sided cardiac catheterization for measuring cardiac output via thermodilution is a standard method for assessing cardiovascular/hemodynamic function in horses. Clinical complications related to right-sided cardiac catheterization in this report include weakness, ataxia, collapse and a concomitant rise in pulmonary artery pressure; clinical signs resolved in two to 24 hours. Differential diagnoses for the clinical signs in the horses of this report include air embolism, stimulation of mechano-receptors in the pulmonary artery (vasospasm/vaso constriction), thromboembolism, stress, and sepsis or endotoxemia. Awareness of the potential risks of cardiac catheterization in horses may help researchers and clinicians to prevent or minimize some of the more serious complications inherent to the procedure.
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