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Katherine Kosiv, MD

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Assistant Professor of Pediatrics (Cardiology)


Associate Director of Fetal Cardiology, Pediatrics



Assistant Professor of Pediatrics (Cardiology)

Associate Director of Fetal Cardiology, Pediatrics


Katherine (“Katya”) is a board-certified pediatric cardiologist with expertise in cardiac imaging and fetal cardiology. After obtaining her medical degree from Ross University, she completed her pediatric residency at the Children's Hospital of Illinois and her pediatric cardiology fellowship at Arkansas Children's Hospital. She then went on to complete an advanced imaging fellowship at UCSF Benioff Children's Hospital where she trained with international experts in fetal cardiology.

During her fellowship, she investigated outcomes of congenital heart surgery in patients with trisomy 13 and 18. That work culminated in an important publication highlighting that congenital heart surgery improves in-hospital mortality in children with trisomy 13 and 18 (Kosiv et al, Pediatrics, 2017). She continues to engage in research with her mentor to devise recommendations for congenital heart surgery in trisomy 13 and 18. In addition, Dr. Kosiv has investigated the effect of congenital diaphragmatic hernia on the fetal heart and fetal brain and continues to be interested in the effects of non-cardiac diseases on the fetal heart such as in twin-twin transfusion syndrome and lower urinary tract obstruction. She is currently planning an investigation of the genetic predictors of left sided obstructive heart diseases such as hypoplastic left heart syndrome and aortic stenosis. She hopes that with this information in hand, cardiologists will be able to better predict which patients will go on to develop severe left sided obstruction.


Other Departments & Organizations

Education & Training

Advanced Fellow
University of California, San Francisco (2019)
University of Arkansas for Medical Sciences (2018)
University of Illinois, College of Medicine-Peoria (2015)
University of Illinois, College of Medicine-Peoria (2013)
Ross University School of Medicine (2012)



Medical Subject Headings (MeSH)

Congenital Abnormalities; Decision Making, Shared; Embryonic and Fetal Development; Fetal Diseases; Fetal Heart; Heart Defects, Congenital; Hydrops Fetalis; Trisomy 13 Syndrome; Trisomy 18 Syndrome

Research at a Glance

Yale Co-Authors

Frequent collaborators of Katherine Kosiv's published research.








Academic Achievements and Community Involvement

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    Fulbright Scholar

Clinical Care


Katherine Kosiv, MD, is a pediatric cardiologist with expertise in cardiac imaging and fetal cardiology. She cares for children and young adults with congenital or acquired heart disease, and pregnant women with fetuses that have a suspected congenital heart defect. She has expertise in fetal cardiology and noninvasive imaging, and performs transthoracic, transesophageal, and fetal echocardiography.

“Fetal heart development begins very early in pregnancy, and with the advances in imaging, we're able to see and diagnose most congenital heart disease,” Dr. Kosiv says. It helps that the latest imaging tools are precise enough to show tiny fetal heart structures almost down to one to two millimeters, she says. “For some infants, that is vital, because the problem or the need for intervention may occur at the moment the child is born.”

Treating a newborn with a heart problem calls for complex skills and an inquiring mind, says Dr. Kosiv, who also does research to find better treatments for her patients, and currently is interested in genetic predictors of left-sided obstructive heart diseases, such as hypoplastic left heart syndrome and aortic stenosis (a narrowing of the aortic valve opening). It also calls for the ability to foster bonds with families, she says. “I think the relationship between the physician and the patient can become very close, because it's a shared experience, in some ways.”

Clinical Specialties

Pediatric Cardiology

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