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Juan L. Martinez-Poyer, M.D.
Pediatric Surgery

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Administrative Office:
Children’s Hospital of Philadelphia
34th Street & Civic Center Boulevard
5th Floor, Wood Center
Philadelphia, PA  19104
Administrative Assistant: Cherie Sutherland
Administrative Phone: 267-426-7187
Administrative Fax: 215-590-2447


Dr. Juan Luis Martinez-Poyer is an attending physician at the Center for Fetal Diagnosis and Treatment at The Children’s Hospital of Philadelphia and a Clinical Assistant Professor of obstetrics and gynecology at the Perelman School of Medicine, University of Pennsylvania.

His areas of interest within maternal-fetal medicine include, prenatal diagnosis, fetal therapy, multiple gestations and fetal cardiovascular hemodynamics.

“This is the most prestigious center for fetal therapy in the world,” he says. “I have known the people who lead this center for many years and have always wanted to work with them. They are pioneers in the field and have contributed a great deal to this specialty. It’s very exciting to be a part of the team.”

Prior to joining the Center team in 2012, Dr. Martinez-Poyer served as a maternal-fetal medicine specialist at Northwest Perinatal Center, a provider of comprehensive medical services for high-risk pregnancies in Portland, Ore. He also served as a visiting physician at the Harris Birthright Research Center for Fetal Medicine in London’s King’s College Hospital, and chief of obstetrics and gynecology at Three Rivers Health, Three Rivers, Michigan.

Dr. Martinez-Poyer was born and raised in Venezuela. He earned his medical degree from the Luis Razetti, M.D., School of Medicine at the Central University of Venezuela. He completed his residency in obstetrics and gynecology and a fellowship in maternal-fetal medicine at Wayne State University School of Medicine, Detroit, Mich. He is board certified in obstetrics and gynecology and maternal-fetal medicine.

He has been involved in research in the areas of obstetric ultrasound and fetal left cardiac function. He has published articles in the Journal of Ultrasound in Medicine, Radiology, the American Journal of Obstetrics & Gynecology, and the New England Journal of Medicine. He is currently participating in a new research study at CHOP aimed at improving the outcome prediction of fetuses with diaphragmatic hernia.

Faculty Appointments
06/01/12 - present   Assistant Professor of Clinical Obstetrics & Gynecology in Surgery
Perelman School of Medicine, University of Pennsylvania
Philadelphia, Pennsylvania
Hospital and Administrative Appointments
01/01/85 - 11/30/85  Rural Physician, La Arenera Primary Care Center
Baruta, Estado Miranda, Venezuela
05/01/88 - 03/01/89 General Practice Physician in Obstetrics & Gynecology Ultrasound
Centro Clínico Profesional Caracas
Caracas, Venezuela
11/02/99 - 11/02/02  Chief of Service in Obstetrics & Gynecology, Three Rivers Area Hospital
Three Rivers, Michigan
01/13/03 - 05/31/12 Staff Physician in Obstetrics & Gynecology
Northwest Perinatal Center
Portland, OR
06/01/12 - present  Active Physician, Children’s Hospital of Philadelphia
Philadelphia, Pennsylvania
Other Appointments
04/23/89 - 09/30/90  Research Assistant to Dr. Frank Hadlock, Department of Radiology
Baylor College of Medicine
Houston, Texas
11/25/02 - 12/20/02 Instructional Visit to the Harris Birthright Research Center for Fetal Medicine
King’s College Hospital, London, United Kingdom
09/1977 - 11/1984 M.D.    Central University of Venezuela Medical School
Caracas, Venezuela
Postgraduate Training and Fellowship Appointments
12/15/85 - 12/15/86 Internship in Obstetrics & Gynecology
Los Magallanes de Catia General Hospital
Caracas, Venezuela
04/01/86 - 04/30/88 Training in Obstetrics & Gynecology Ultrasound
Leopoldo Aguerrevere Clinic & Concepción Palacios Maternity Hospital
Caracas, Venezuela
10/01/90 - 09/30/91   Clinical Research Fellow in Obstetric Ultrasound
Department of Obstetrics & Gynecology
University of Oklahoma College of Medicine
Oklahoma City, Oklahoma
10/01/91 - 01/31/92 Postdoctoral Research Fellow in Perinatal Research
Department of Obstetrics & Gynecology
Yale University School of Medicine
New Haven, Connecticut
02/01/92 - 05/31/92 Postdoctoral Research Fellow, Maternal-Fetal Medicine
Wayne State University School of Medicine/Hutzel Hospital
Detroit, Michigan
07/01/92 - 06/30/96  Residency in Obstetrics & Gynecology
Wayne State University School of Medicine/Hutzel Hospital
Detroit, Michigan
07/01/96 - 03/30/99 Maternal-Fetal Medicine Fellowship
Wayne State University School of Medicine/Hutzel Hospital
Detroit, Michigan
National/International Societies
1984 - present  Venezuelan College of Physicians
1984 - present  Venezuelan Medical Federation
1992 - present  American College of Obstetricians & Gynecologists
1995 - present  American Institute of Ultrasound in Medicine
1997 - present  Society for Maternal/Fetal Medicine
2006 - present  International Society of Ultrasound in Obstetrics & Gynecology
Research Publications, Peer Reviewed:
  1. Martinez-Poyer J.  Relación entre la longitude del femur y la edad gestacional en la población venezolana.  Revista de la Sociedad Venezolana de Obstetricia y Ginecología 3:45, 1986.
  2. Hadlock FP, Harrist RB, Martinez-Poyer J.  In utero analysis of fetal growth: A sonographic weight standard.  Radiology 181(1):129-133, Oct. 1991.
  3. Hadlock FP, Harrist RB, Martinez-Poyer J.  How accurate is second trimester fetal dating?  Journal of Ultrasound in Medicine 10(10):557-561, Oct. 1991.
  4. Hadlock FP, Harrist RB, Martinez-Poyer J.  Fetal body ratios in second trimester: A useful tool for identifying chromosomal abnormalities?  Journal of Ultrasound in Medicine 11(2):81-85, Feb. 1992.
  5. Hallak M, Martinez-Poyer J, Kruger ML, Hassan S, Blackwell SC, Sorokin Y.  The effect of magnesium sulfate on fetal heart rate parameters: A randomized, placebo-controlled trial.  American Journal of Obstetrics & Gynecology 181(5 Pt 1):1122-1127, Nov. 1999.
  6. Mari G, Deter RL, Carpenter RL, Rahman F, Zimmerman R, Moise KJ Jr, Dorman KF, Ludomirsky A, Gonzalez R, Gomez R, Oz U, Detti L, Copel JA, Bahado-Singh R, Berry S, Martinez-Poyer J, Blackwell SC.   Noninvasive diagnosis by Doppler ultrasonography of fetal anemia due to maternal red-cell alloimmunization. Collaborative Group for Doppler Assessment of the Blood Velocity in Anemic Fetuses.  New England Journal of Medicine 342(1):9-14, Jan. 6, 2000.
  7. Martinez-Poyer J, Hallak M, Russell E, Poole-Bryant K, Sorokin Y.  Magnesium sulfate prolongs ventricular repolarization in normal gravidas: A randomized, double-blind, placebo-controlled study.  American Journal of Obstetrics & Gynecology 2012 (in press).

Juan L. Martinez-Poyer, M.D.

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