Dr med.
| 09.11.1972 | born in Haan married, 2 children |
| 1979 – 1980 | Primary school in Mönchengladbach-Haardt |
| 1980 – 1983 | Schmidt-Bleibtreu Primary School Rheydt-Odenkirchen |
| 1983 – 1992 | Rheydt-Odenkirchen Grammar School |
| Jan - Jun 1990 | Taconic Hills High-shool, Philmont, U.S.A. |
| Jun. 1992 | Abitur at Rheydt-Odenkirchen municipal grammar school |
| 1993 – 1994 | Civilian service: Laboratory for Metabolism and Nutrition, University of Düsseldorf |
| 1994 – 2001 | Studied human medicine at the Albertus Magnus University of Cologne |
| 1996 | Physics exam |
| 1997 | First state examination |
| 1999 | Clinical traineeship at Queen's Medical Centre, Nottingham, UK; acute general and respiratory medicine |
| 2000 | Second state examination |
| 2001 | Practical year at the University Hospital of Cologne, optional subject gynaecology Third state examination |
| 08/2001 – 01/2003 | AiP and research assistant at the University Women's Hospital Düsseldorf |
| 07/2003 – 03/2006 | Assistant doctor, Heilig-Geist Hospital in Cologne |
| 04/2006 – 10/2007 | Assistant doctor, specialist and senior consultant at Aachen Hospital |
| 13.12.2006 | Recognised as a specialist in gynaecology and obstetrics |
| 29.03.2007 | Admission to DEGUM II examination |
| 03.04.2007 | Head of the Department of Ultrasound and Prenatal Diagnostics at the University Women's Hospital Aachen as a senior physician |
| 02.07.2007 | Recognition of DEGUM level II: practical and oral examination with Prof Schmidt in Homburg an der Saar |
| 01.10.2007 | Employed physician at the medical partnership PD Dr P. Kozlowski und Partner | Praenatal Medicine and Genetics, Prof. Kozlowski und Kollegen in Düsseldorf |
| From 2008 | Deputy Head of the Prenatal Diagnostics and Therapy Department at the Women's Clinic of the Municipal Hospitals of the City of Cologne/Holweide |
| 01.04.2008 | Change to the practice for prenatal medicine and genetics in Cologne |
| 01.10.2012 | Joining the partnership PD Dr P. Kozlowski and Partners | Praenatal Medicine and Genetics, Prof. Kozlowski and colleagues |
| 2013 | Co-founder of the Cologne initiative Diabetes in Pregnancy KIDS |
| 2014 | Membership of the DEGUM working group on foetal echocardiography |
| 26.09.2015 | Recognition as DEGUM level II course instructor |
| 2016 | Foundation of the medical partnership for prenatal medicine and genetics prenatal plus in Cologne |
| 1996 - 1999 | Doctoral studies at the Institute of Neurophysology at the University of Cologne under Prof Dr J. Hescheler. Topic: "P-glycoprotein-associated chloride channels and volume regulation in proliferating and dormant cells of multicellular tumour spheroids." |
| 08/2003 | Rigorosum, magna cum laude |
| DGGG | German Society for Gynaecology and Obstetrics |
| DEGUM | German Society for Ultrasound in Medicine Classification: Level II/Seminar or training instructor |
| BVF | Professional association of gynaecologists |
| ISUOG | International Society of Ultrasound in Obstetrics and Gynecology |
| FMF | The Fetal Medicine Foundation (London, UK) |
- Fetal cardiac function parameters
- Prenatal monitoring of diabetic pregnancies
- J. Ritgen, P. Kozlowski, R. Stressig "Maternal diabetes: effect on foetal myocardial function" Three-country meeting, Mainz 2010.
- J. Ritgen, P. Kozlowski, R. Stressig "Tissue Doppler measurements: Influence of the equipment on the measurement of foetal cardiac time intervals" Three-country meeting, Mainz 2010.
- J. Ritgen, P. Kozlowski, R. Stressig "Pulsed Tissue Doppler in the surveillance of diabetic pregnancies: prenatal changes of fetal cardiac time intervals and postnatal outcome", WFUMB, Vienna 2011.
- J. Ritgen, M. Kolsch, R. Stressig "Fetal cardiac tissue doppler: Effect of the doppler angle on time intervals", Dreiländertreffen, Stuttgart 2013.
- J. Ritgen, P. Kozlowski, R. Hammer, HJ. Siegmann, S. Fröhlich, R. Stressig "Fetometry and gestational diabetes: the choice of standard curves influences therapy", Dreiländertreffen, Innsbruck 2014
- "Multiple pregnancies: Aspects of first trimester screening" Prenatal NT course, Düsseldorf, 09 November 2007
- "Pre-eclampsia screening in the first trimester: Are there new opportunities for effective treatment?", ETS course, Düsseldorf, 12 November 2010
- "xMatrix and Purewave in routine diagnostics", Prenatal diagnostics in the ultrasound boat, Cologne, 02/06/2012
- "Diagnostic possibilities of 3D sonography", Siegen Prenatal Days, 16.02.2013
- "Fetal cardiac function", The little left heart, Giessen, 27/09/2013
- "First trimester screening incl. live ultrasound", DGPGM, Bonn 16 May 2014
- J. Ritgen, R. Stressig "First trimester screening or amniocentesis?" gynaecology + obstetrics 2011/9: 16-20
- J. Ritgen, T. Kohl, C. Enzensberger, R. Axt-Fliedner, T. Schaible, and R. Stressig "Prenatal diagnosis of and therapy for congenital diaphragmatic hernia" Z Obstetrics Neonatol 218, 6-17; 2014.
- J. Ritgen, T. Kohl, C. Enzensberger, R. Axt-Fliedner, T. Schaible, and R. Stressig "Prenatal diagnosis and treatment of congenital diaphragmatic hernia". Gyn up2date 2015, in press.
- C. Amann, A. Geipel, A. Müller, A. Heep, J. Ritgen, R. Stressig, P. Kozlowski, U. Gembruch, and C. Berg "Fetal anemia of unknown cause- a diagnostic challenge" Ultrasound Med 32 2011;Suppl 2, E134-40.
- A. Willruth, N. Dwinger, J. Ritgen, R Stressig, A. Geipel, U. Gembruch and C Berg "Fetal Aberrant Right Subclavian Artery (ARSA) - a Potential New Soft Marker in the Genetic Scan?" Ultrasound Med 33 2012; E114-8.
- A. Schulz, E. Bartels, R. Stressig, J. Ritgen, E. Schmiedeke, M. Mattheisen, M. Draaken, M. Ludwig, S. Bagci, A. Müller, U. Gembruch, A. Geipel, C. Berg, A. Heydweiller, H. Bachour, J. Schumacher, P. Bartmann, M. Nöthen, H. Reutter "Nine new twin pairs with esophageal atresia: A review of the literature and performance of a twin study of the disorder" Birth Defects Res Part A Clin Mol Teratol 2012;94:182-186.
- Bartels E, Schulz AC, Mora NW, Pineda-Alvarez DE, Wijers CH, Marcelis CM, Stressig R, Ritgen J, Schmiedeke E, Mattheisen M, Draaken M, Hoffmann P, Hilger AC, Dworschak GC, Baudisch F, Ludwig M, Bagci S, Müller A, Gembruch U, Geipel A, Berg C, Bartmann P, Nöthen MM, van Rooij IA, Solomon BD, Reutter HM. "VATER/VACTERL association: identification of seven new twin pairs, a systematic review of the literature, and a classical twin analysis" Clin Dysmorphol. 2012 Oct; 21(4):191-5.
- Schulz AC, Stressig R, Ritgen J, Bagci S, Müller A, Gembruch U, Geipel A, Berg C, Bartmann P, Reutter HM "A classic twin study of isolated gastroschisis" Fetal Pediatr Pathol. 2012 Oct;31(5):324-30.
- J. Bildau, C. Enzensberger, J. Degenhardt, A. Kawecki, A. Tenzer, T. Kohl, R. Stressig, J. Ritgen, B. Utsch, and R. Axt-Fliedner "Lower Urinary Tract Obstruction (LUTO) - Clinical Picture, Prenatal Diagnostics and Therapeutic Options" Z Obstetrics Neonatol 2014; 218, 18-26.