Retrospective evaluation of and risk factor analysis for presumed fluid overload in cats with urethral obstruction: 11 cases (2002-2012).

FO is a possible complication of the treatment of UO. The administration of a fluid bolus on presentation, and the development of a heart murmur or gallop sound during treatment were the most clinically useful risk factors identified. The development of FO is associated with significant increases in both the cost and length of hospitalization, but was not associated with increased mortality.