New Bolton Center Kennett Square, PA
Emergencies & Appointments:
Ryan Hospital Philadelphia, PA


Professor, Cardiology, University of Pennsylvania School of Veterinary Medicine

Diplomate, European College of Veterinary Internal Medicine-Companion Animals (Cardiology)

Diplomate, American College of Veterinary Internal Medicine (Cardiology)

Clinical Specialties: Companion animal cardiology
Research Areas: Companion animal cardiology, arrhythmias, electrophysiology
PubMed Link
Contact Information:

companion animal cardiology

companion animal cardiology

Pedro, B., Dukes-McEwan, J., Oyama, M. A., Kraus, M. S., Gelzer, A. R. Retrospective evaluation of the effect of heart rate on survival in dogs with atrial fibrillation J Vet Intern Med : , 2017.

Kraus, M. S., Gelzer, A. R., Rishniw, M. Detection of heart rate and rhythm with a smartphone-based electrocardiograph versus a reference standard electrocardiograph in dogs and cats J Am Vet Med Assoc 249: 189-194, 2016.

Gelzer, A. R., Kraus, M. S., Rishniw, M. Evaluation of in-hospital electrocardiography versus 24-hour Holter for rate control in dogs with atrial fibrillation J Small Anim Pract 56: 456-462, 2015.

Gelzer, A. R. M., Kraus, M. S., Rishniw, M., Hemsley, S. A., Moïse, N. S. Combination therapy with mexiletine and sotalol suppresses inherited ventricular arrhythmias in German shepherd dogs better than mexiletine or sotalol monotherapy: a randomized cross-over study J Vet Cardiol 12: 93-106, 2010.

Gelzer, A. R. M., Kraus, M. S., Rishniw, M., Moïse, N. S., Pariaut, R., Jesty, S. A., Hemsley, S. A. Combination therapy with digoxin and diltiazem controls ventricular rate in chronic atrial fibrillation in dogs better than digoxin or diltiazem monotherapy: a randomized crossover study in 18 dogs J Vet Intern Med 23: 499-508, 2009.

Jesty, S. A., Kraus, M. S., Gelzer, A. R., Rishniw, M., Moise, N. S. Effect of transvenous electrical cardioversion on plasma cardiac troponin I concentrations in horses with atrial fibrillation J Vet Intern Med 23: 1103-1107, 2009.

Gelzer, A. R. M., Koller, M. L., Otani, N. F., Fox, J. J., Enyeart, M. W., Hooker, G. J., Riccio, M. L., Bartoli, C. R., Gilmour, R. F. Dynamic mechanism for initiation of ventricular fibrillation in vivo Circulation 118: 1123-1129, 2008.

Oxford, E. M., Everitt, M., Coombs, W., Fox, P. R., Kraus, M., Gelzer, A. R. M., Saffitz, J., Taffet, S. M., Moïse, N. S., Delmar, M. Molecular composition of the intercalated disc in a spontaneous canine animal model of arrhythmogenic right ventricular dysplasia/cardiomyopathy Heart Rhythm 4: 1196-1205, 2007.

Gelzer, A. R. M., Moïse, N. S., Koller, M. L. Defibrillation of German shepherds with inherited ventricular arrhythmias and sudden death J Vet Cardiol 7: 97-107, 2005.

Gelzer, A. R., Moïse, N. S., Vaidya, D., Wagner, K. A., Jalife, J. Temporal organization of atrial activity and irregular ventricular rhythm during spontaneous atrial fibrillation: an in vivo study in the horse J Cardiovasc Electrophysiol 11: 773-784, 2000.

PhD (Veterinary Cardiology) University of Bern-Switzerland, 2010 (Veterinary Medicine) University of Bern-Switzerland, 1992