Dr. Marie Holowaychuk, DVM, Dip ACVECC 

Dr. Marie Holowaychuk is one of two board-certified specialists in emergency and critical care at the OVC.  She grew up inMarieHolowaychuk.jpg Edmonton, AB and has been a faculty member on the Critical Care Service since October 2008.  Dr. Holowaychuk obtained her doctor of veterinary medicine from the Western College of Veterinary Medicine and completed her residency in emergency and critical care at North Carolina State University.  She enjoys caring for all of the pets hospitalized in the ICU, but has a special interest in dogs and cats with trauma or sepsis (severe systemic infection).  Dr. Holowaychuk is a member of the Journal of Veterinary Emergency and Critical Care editorial board and spends a large amount of time performing manuscript reviews and mentoring veterinary and graduate students.  In her spare time, she enjoys running with her Standard Poodle named Faith. 

Dr. Holowaychuk’s research is focused on electrolyte (calcium) and coagulation (blood clotting) abnormalities in dogs with trauma or sepsis (systemic inflammation).   She hopes to identify markers for survival in dogs with these conditions, to better guide veterinarians and owners in making decisions about care for their patients and pets.  Dr. Holowaychuk believes in performing multicenter research and collaborates with several veterinary teaching hospitals across the United States.  She also enjoys spreading interest in emergency and critical care and enthusiastically mentors veterinary students with research projects related to trauma and transfusion medicine each summer.   


·         Holowaychuk MK, Birkenheuer AJ, Li, J, Marr H, Boll A, Nordone SK. Alterations in calcium homeostasis in dogs with induced endotoxemia. J Vet Intern Med 26(2):244-52, 2012.

·         Holowaychuk MK and Monteith G. Ionized hypocalcemia is a prognostic indicator in dogs following trauma. J Vet Emerg Crit Care 21(5):2011;521-530, 2011.

·         Boyle TE, Holowaychuk MK, Adams AK, Marks SL. Successful treatment of congestive heart failure in three cats with hyperviscosity syndrome using plasmapheresis. J Am Anim Hosp Assoc 47(1):50-55, 2011.

·         Sikorski LE, Birkenheuer AJ, Holowaychuk MK, McCleary-Wheeler AL, Davis JM, Littman MP. Babesiosis caused by a large Babesia species in 7 immunocompromised dogs. J Vet Intern Med 24(1):127-131, 2010.

·         Shearer LR, Boudreau AE, Holowaychuk MK. Distal renal tubular acidosis and immune-mediated hemolytic anemia in 3 dogs. J Vet Intern Med 23(6):1284-1288, 2009.

·         Holowaychuk MK, Hansen BD, DeFrancesco TC, Marks SL. Ionized hypocalcemia in critically ill dogs. J Vet Intern Med 23(3):509-513, 2009.