Lauren and JJ share a case of a sick kitty who has been straining in the litterbox. The ladies provide a comprehensive review of diagnosis and treatment of feline urethral obstruction, including hyperkalemia. Sources:Rothrock, K: Urethral Obstruction. In: Feline VINcyclopedia. Veterinary Information Network, Davis, CA. Accessed 4/13/2021. Cooper E: Feline Urethral Obs. International Veterinary Emergency and Critical Care Symposium 2010.Cunha M G M C M, Freitas G C, Carregaro A B, et al : Renal and cardiorespiratory effects of treatment with lactated Ringer's solution or physiologic saline (0.9% NaCl) solution in cats with experimentally induced urethral obstruction. Am J Vet Res 2010 Vol 71 (7) pp. 840-6.Lane I F: Common Challenges in Feline Urethral Obstruction . Western Veterinary Conference 2012.