Nikolaos Zacharias MD FACOG (He/Him)

Maternal & Fetal Medicine/High Risk

Director of Medical Education - Obstetrix MFM Specialists of Houston, Pediatrix; MFM Director and Chairman of OB/GYN Department - Saint Joseph's Medical Center, Healthcare Systems of America; Clinical Professor of OB/GYN-MFM, University of Houston Tilman J. Fertitta Family College of Medicine; Subspecialty Faculty Educator - MFM Consultant, Houston Methodist Hospital OB/GYN Residency Program.

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2100 Travis St#1250Houston, TX 77002
Phone+1 346-348-1980
Fax+1 281-763-7717

Summary

Dr. Nikolaos Zacharias is a maternal-fetal medicine expert based in Houston, TX, with a strong focus on high-risk pregnancies. He completed his medical education at the University of Athens, Greece, and advanced training through internships, residency, and a fellowship at Baylor College of Medicine and the University of Texas Medical Branch. Dr. Zacharias holds multiple consulting and academic positions, including Chairman of the Department of Obstetrics & Gynecology at St. Joseph Medical Center and Clinical Professor of OB/GYN-MFM at the University of Houston Tilman J. Fertitta Family College of Medicine. He has authored several publications in esteemed journals, demonstrating his expertise in the field. His clinical interests include fetal echocardiography, prenatal diagnosis/ultrasound, pregnancy complications, serving underserved prenatal populations and engaging in relevant perinatal research. He is the Medical Education Director for the Obstetrix MFM Specialists of Houston and the MFM Consultant/Faculty at the prestigious Houston Methodist Hospital's OB/GYN Residency Program.

Education & Training

University of Texas Medical Branch HospitalsFellowship, Maternal-Fetal Medicine, 2002 - 2005
University of Texas Medical Branch Graduate School of Biomedical SciencesMMS, thesis pending, 2002 - 2005
Baylor College of MedicineChief Residency, Obstetrics and Gynecology, 2001 - 2002
Baylor College of MedicineResidency, Obstetrics and Gynecology, 1998 - 2002
Baylor College of MedicineInternship, Obstetrics and Gynecology, 1998 - 1999
University of AthensClass of 1995, MD, Magna Cum Laude - Excellent
Sorbonne UniversitySorbonne II, French Literature, 1986 - 1988
University of CambridgeProficiency in English Language, Proficiency in English Language, 1984 - 1986

Certifications & Licensure

TX State Medical License 2005 - 2027
American Board of Obstetrics and Gynecology Obstetrics & Gynecology
American Board of Obstetrics and Gynecology Maternal-Fetal Medicine

Awards, Honors, & Recognition

Chairman of OB/GYN Department St. Joseph Medical Center - Houston, 2025
Clinical Professor of OB/GYN-MFM University of Houston Tilman J. Fertitta Family College of Medicine, 2025
Dean’s Faculty Teaching Award McGovern Medical School at UTHEALTH, 2015-2017
Regular Member Society for Maternal-Fetal Medicine, 2012
Elected to America’s Top Obstetricians & Gynecologists Consumers' Research Council of America, 2012
Madison Who’s Who of Executives and Professionals Madison Who’s Who, 2010
Voted for the Student Faculty Teaching Award Baylor College of Medicine, 2010
Marquis Who’s Who in Medicine and Healthcare and in Science and Engineering Marquis Who’s Who, 2005
Academic Fellowship Award University of Texas Medical Branch Hospital, 2002
Scored at the top 5% of all US Ob/Gyn residents Annual CREOG Examinations, 1999
Awarded Honorary Plaques for Outstanding Academic Performance Baylor College of Medicine department of Obstetrics and Gynecology, 1999
Scored highest in the examinations for the Kontoleon Scholarship National and Kapodistrian University of Athens, 1997
Scored at the top 5% on Steps 1 to 3 United States Medical Licensing Examination, 1996
Graduated “Ptycheion Iatrikes”, [i.e. Medical Diploma], with the degree of “Excellent”; First in Class National and Kapodistrian University of Athens School of Health Sciences, 1995
Scored highest in the examinations in the Papadakis Scholarship National and Kapodistrian University of Athens, 1990
Ranked among the top 3% of class National and Kapodistrian University of Athens School of Medicine, 1990
Graduated First in Class Papagos Lyceum, 1989
Ranked 13th among more than 10,000 applicants in the Pan-Hellenic examinations for admission National and Kapodistrian University of Athens School of Medicine, 1989
Award from the Rotary Club of East Attica Rotary Club of East Attica, 1989
Honorary Scholarship National Scholarship Foundation, 1989
Full Tuition Scholarship for the Masters in Medical Science (MMSc) degree UTMB department of Obstetrics and Gynecology
Physician Recognition Award American Medical Association
Fellow (FACOG) American Congress of Obstetricians and Gynecologists
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Publications & Presentations

PubMed

3 citations
Cyclone sign: prenatal ultrasound diagnosis of a true umbilical cord knot.
Nikolaos Marios Zacharias, Jessica Rhinehart-Ventura
American Journal of Obstetrics and Gynecology. 2023-04-01
13 citations
Exploring experiences and expectations of prenatal health care and genetic counseling/testing in immigrant Latinas.
Georgiann Garza, Priscila Hodges‐Delgado, Jennifer Hoskovec, Guadalupe R. Palos, Chelsea Wagner
Journal of Genetic Counseling. 2020-08-01
16 citations
Planned versus Unplanned Delivery for Placenta Accreta Spectrum.
Michal Fishel Bartal, Ramesha Papanna, Nikolaos Zacharias, Neomary Soriano-Calderon, Maria Limas
American Journal of Perinatology. 2020-07-23

Journal Articles

First Neonatal Demise with Travel-Associated Zika Virus Infection in the United States of America.
Zacharias N, Whitty J, Noblin S, Tsakiri S, Garcia J, Covinsky M, Bhattacharjee M, Saulino D, Tatevian N, Blackwell S., American Journal of Perinatology Reports, 4/13/2017
Maternal morbidity in patients with morbidly adherent placenta treated with and without a standardized multidisciplinary approach.
Shamshirsaz AA, Fox KA, Salmanian B, Diaz-Arrastia CR, Lee W, Baker BW, Ballas J, Chen Q, Van Veen TR, Javadian P, Sangi-Haghpeykar H, Zacharias N, Welty S, Cassady CI..., American Journal of Obstetrics and Gynecology, 2/1/2015
Prospective trial on obstructive sleep apnea in pregnancy and fetal heart rate monitoring
Olivarez S, Maheshwari B, McCarthy M, Zacharias NM, Van den Veyver I, Casturi L, Sangi-Haghpeykar H, Aagaard-Tillery K, American Journal of Obstetrics and Gynecology, 8/1/2010
Right-lower quadrant pain and suspected appendicitis in Pregnant Women: Evaluation with MR Imaging-Initial Experience
Oto, Ernst, Shah, Koroglu, Chaljub, Gei, Saade, Zacharias NM, Radiology, 1/1/2005
High false-positive rate of human immunodeficiency virus rapid serum screening in a predominantly Hispanic population
Zacharias NM, Athanassaki ID, Sangi-Haghpeykar H, Gardner MO, J Perinatol, 1/1/2004
Microcephaly: an epidemiological analysis
Zacharias NM, Am J Obstet Gynecol, 1/1/2003
Predictability of intrapartum and neonatal outcomes with the amniotic fluid volume distribution: A reassessment using the amniotic fluid index, single deepest pocket, ...
Zacharias NM, Am J Obstet Gynecol, 1/1/2003
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Books/Book Chapters

Shnider & Levinson’s Anesthesia for Obstetrics
Chapter: Anesthesia for Vaginal Birth after Cesarean Delivery
Zacharias NM, LaToya Mason CEditors: Suresh M.Lippincott Williams & WilkinsEdition 5th,2012
Obstetric Imaging
Chapter: DiGeorge, Wolf-Hirschhorn and Cri-du-chat Syndromes
Zacharias NM, Van den Veyver IEditors: Copel J.McGraw-Hill2012

Abstracts/Posters

Maternal-fetal and gestational characteristics and microsomal aromatase activity in human placentas
Zacharias NM, Society of Maternal-Fetal Medicine Annual (The pregnancy TM) Meeting, Dallas, TX, 2/1/2012
Creating a customized Birth Weight Standard for Harris County’s Hispanic Population
Amini S, Francis A, Sangi-Haghpeykar H, Gardosi J, Zacharias NM, Society of Maternal-Fetal Medicine Annual (The pregnancy TM) Meeting, San Francisco, CA, 2/1/2011
Prevalence and clinical significance of Polyhydramnios during Screening Prenatal Sonography in a modern Hispanic cohort
Kim J, Sangi-Haghpeykar H, Zacharias NM, Society of Maternal-Fetal Medicine Annual (The pregnancy TM) Meeting, San Francisco, CA, 2/1/2011
Predicting the Delivery Date at Term in a Hispanic Population: the Case for the Fetal Transcerebellar Diameter
Labanca F, Sangi-Haghpeykar H, Zacharias NM, American Congress/College of Obstetricians and Gynecologists Annual Clinical Meeting (ACM), San Francisco, CA, 5/1/2010
Spontaneous Preterm Delivery and Transabdominally Assessed Cervical Length during Screening Prenatal Sonography: A Case-control Study
Doan QT, Sangi-Haghpeykar H, Zacharias NM, American Congress/College of Obstetricians and Gynecologists Annual Clinical Meeting (ACM), San Francisco, CA, 5/1/2010
Prospective Trial on Obstructive Sleep Apnea in Pregnancy and Fetal Heart Monitoring
Zacharias NM, Society of Maternal-Fetal Medicine Annual (The pregnancy TM) Meeting, San Diego, CA, 1/1/2009
Maternal-Fetal Characteristics and Fetal Femur Diaphysis Length in a Predominantly Hispanic Population
Zacharias NM, Agboola, and Sangi-Haghpeykar H, Society of Maternal-Fetal Medicine Annual (The pregnancy TM) Meeting, San Diego, CA, 1/1/2009
Maternal-Fetal characteristics and aromatase activity in term human placental microsomes
Zacharias NM, National Women’s Health Week - Mini Medical School Poster Session, Galveston, TX, 5/1/2004
Balloon-tip catheter occlusion of the hypogastric arteries in the surgical management of placenta accreta
Zacharias NM, National Women’s Health Week - Mini Medical School Poster Session, Galveston, TX, 5/1/2004
Terbutaline in the management of intrapartum fetal bradycardia
Zacharias NM, Pacheco, Vidal, Saade, Hankins, Annual Clinical Meeting of the Society of Maternal-Fetal Medicine, New Orleans, LA, 1/1/2004
MRI in the evaluation of acute abdomino-pelvic pain during pregnancy: initial experience
Zacharias NM, Oto, Saade, Gei, Annual Clinical Meeting of the Society of Maternal-Fetal Medicine, New Orleans, LA, 1/1/2004
Balloon-tipped catheters in the management of placenta accreta: a case series
Zacharias NM, Hankins, Saade, Vadhera, Gei and VanHook, Annual Clinical Meeting of the Society of Maternal-Fetal Medicine, New Orleans, LA, 1/1/2004
Aspirin for the prevention of pre-eclampsia: a systematic review
Zacharias NM, Saade, Bukowski and Sibai, Annual Clinical Meeting of the Society of Maternal-Fetal Medicine, New Orleans, LA, 1/1/2004
Maternal-Fetal Characteristics and Term Human Placental Microsome Aromatase Activity
Zacharias NM, Society of Gynecological Investigation Annual Meeting, Houston, TX, 1/1/2004
Aspirin for the prevention of fetal growth restriction (FGR): a systematic review
Zacharias NM, Bukowski, Suarez, Saade, Sibai, 10th Annual South-Central Conference on Perinatal Research, Austin, TX, 10/1/2003
High false-positive rate of HIV ELISAs in a predominantly Hispanic prenatal population
Zacharias NM, Gardner MO, Sangi-Haghpeykar H, 10th Annual South-Central Conference on Perinatal Research, Austin, TX, 10/1/2003
Aspirin for the prevention of fetal growth restriction (FGR): a systematic review
Zacharias NM, Bukowski, Suarez, Saade, Sibai, Annual Clinical Meeting of the Society for Maternal-Fetal Medicine, San Francisco, CA, 1/1/2003
High false-positive rate of HIV ELISAs in a predominantly Hispanic prenatal population
Zacharias NM, Gardner, Sangi-Haghpeykar, Annual Clinical Meeting of the Society for Maternal-Fetal Medicine, San Francisco, CA, 1/1/2003
Predictability of intrapartum and neonatal outcomes with the amniotic fluid volume distribution: A reassessment using the amniotic fluid index, single deepest pocket, ...
Zacharias NM, Annual Meeting of the Central Association Of Obstetricians and Gynecologists, Las Vegas, NV, 10/1/2002
Microcephaly: an epidemiological analysis
Zacharias NM, Annual Meeting of the Central Association Of Obstetricians and Gynecologists, Las Vegas, NV, 10/1/2002
High false-positive rate of Human Immunodeficiency Virus screening in a predominantly Hispanic prenatal population
Zacharias NM, Annual Texas Association of Obstetricians and Gynecologists (TAOG) meeting, Houston, TX, 4/1/2002
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Lectures

Fetal anomaly case presentations
Texas Medical Center, Houston, TX - 3/1/2013
Prenatal imaging of fetal syndromes
Baylor College of Medicine, Houston TX - 2/1/2013
Fetal growth restriction
Baylor College of Medicine, Houston TX - 8/1/2012
Modern Prenatal Ultrasound
2/1/2012
Evidence-based Modern Prenatal Ultrasound
10/1/2010
Prenatal Ultrasound: an evidence-based approach
Houston TX - 10/1/2009
Prenatal sonography in modern prenatal care
Tulsa, OK - 9/1/2009
Evidence-based Prenatal Sonography
Tulsa, OK - 3/1/2009
Hypertensive disorders of pregnancy
Houston, TX - 3/1/2007
Tuberous Sclerosis in perinatology
Houston TX - 10/1/2006
High false-positive rate of Human Immunodeficiency Virus screening in a predominantly Hispanic prenatal population
Houston, TX - 4/1/2003
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