Steven Mast is an Interventional Cardiologist and a Cardiologist in Great Falls, Montana. Dr. Mast is rated as an Advanced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). His top areas of expertise are Heart Attack, Angina, Coronary Heart Disease, Pacemaker Implantation, and Heart Bypass Surgery. Dr. Mast is currently accepting new patients.

Thomas Addison is a primary care provider, practicing in Geriatrics and Internal Medicine in Great Falls, Montana. Dr. Addison is rated as an Experienced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). His top areas of expertise are Idiopathic Edema, Generalized Tonic-Clonic Seizure, Trichohepatoenteric Syndrome, and Anemia. Dr. Addison is currently accepting new patients.

Hanna Konarzewska is a Cardiologist and a Cardiac Electrophysiologist in Great Falls, Montana. Dr. Konarzewska has been practicing medicine for over 43 years and is rated as an Experienced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). Her top areas of expertise are Short QT Syndrome, Postural Orthostatic Tachycardia Syndrome (POTS), Brugada Syndrome, Fainting, and Pacemaker Implantation.

Andrew Carter is an Interventional Cardiologist and a Cardiologist in Great Falls, Montana. Dr. Carter is rated as an Experienced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). His top areas of expertise are Angina, Coronary Heart Disease, Atherosclerosis, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement. Dr. Carter is currently accepting new patients.

Randolph Hutter is a Cardiologist in Great Falls, Montana. Dr. Hutter is rated as an Experienced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). His top areas of expertise are Atherosclerosis, Coronary Heart Disease, Angina, Atrial Fibrillation, and Pacemaker Implantation.

Dr. Jorge (pronounced “George”) Castriz is a board certified interventional cardiologist. Dr. Castriz offers the full complement of cardiology services including arterial catheterization, biventricular pacing, temporary pacemakers, conventional and stress echocardiography as well as exercise and pharmacologic stress testing. He also brings his expertise in all aspects of peripheral angiography and coronary angioplasty (AAA endovascular stent grafts, renal artery stents, angioplasty, DCA, rotablator, brachytherapy, IVUS and physiologic lesion assessment). Dr. Castriz is board certified in Internal Medicine, Cardiovascular Diseases and Interventional Cardiology and is a fellow of the American College of Cardiology. Prior to joining the Great Falls Clinic in 2013, Dr. Castriz maintained an active practice with the Cardiovascular Medical Specialists of the Palm Beaches in Jupiter, Florida. Prior to that, Dr. Castriz owned a private practice in Palm Beach Gardens, Florida for nine years. Dr. Castriz received his medical degree from the University Central Del Este in the Dominican Republic. He completed his internship and residency in Internal Medicine, and his fellowship in Interventional Cardiology at the University of Oklahoma Health Science Center in Oklahoma City, OK. Dr. Castriz is rated as an Experienced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). His top areas of expertise are Angina, Coronary Heart Disease, Heart Attack, Metabolic Syndrome, and Pacemaker Implantation.

Dr. Ritchie offers the full complement of cardiology services including arterial catheterization; temporary pacemakers; conventional and stress echocardiography, transesophageal echocardiography as well as exercise and pharmacologic stress testing. He also brings his expertise in all aspects of coronary angioplasty, including structural heart disease such as closure of atrial septal defects, balloon valvuloplasties; and peripheral angiography (AAA endovascular stent grafts, renal artery stents), DCA, rotablator, brachytherapy, IVUS and physiologic lesion assessment. Dr. Ritchie is board certified in Internal Medicine, Cardiovascular Diseases and Interventional Cardiology. Dr. Ritchie completed his undergraduate work at the University of Evansville, where he played baseball for three years. He attended medical school at Indiana University, where he graduated with highest honors in 1986. He then went on to complete his residency at Case Western Reserve School of Medicine in Cleveland in 1989. From there, he went on to complete his fellowship at Washington University in Saint Louis, where he performed clinical rotations while receiving interventional training. In his spare time Dr. Ritchie enjoys hiking, fishing, hunting, biking and spending time with friends and family. Dr. Ritchie is rated as an Experienced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). His top areas of expertise are Atrial Septal Defect (ASD), Patent Foramen Ovale, Unstable Angina, Carotid Artery Disease, and Pacemaker Implantation.

Dr. Gerasimou has been practicing medicine in Montana for over 20 years. Formerly an interventional cardiologist for 19 years, Dr. Gerasimou transitioned her practice to general cardiology in July 2021. Dr. Gerasimou specializes in all aspects of cardiology and brings with her an extensive cardiac background. Dr. Gerasimou attended Saint Francis University in Loretto, Pennsylvania for her Bachelor of Science in Biology in 1987. She then went on to complete her medical degree from the American University in Montserrat in 1991. She completed her residency in Internal Medicine at the Danbury Hospital in Connecticut in 1994 and her cardiology fellowship at the University of Iowa in 1997. After completing schooling, Dr. Gerasimou accepted her first job as a cardiologist at the Great Falls Clinic in 1998. We are excited to welcome her back to our team full-time! In her spare time, Dr. Gerasimou enjoys spending time with her family and friends. She also enjoys hiking, fly-fishing, skiing and her Peloton bike. Dr. Gerasimou is rated as an Experienced provider by MediFind in the treatment of Dilated Cardiomyopathy (DCM). Her top areas of expertise are Coronary Heart Disease, Angina, Atrial Fibrillation, and Atherosclerosis.