Our practice was established in 1979 by two internal cardiologists as a group practice. Since then it has grown to an associate clinic of five internal cardiologists and two pediatric cardiologists.  In 2008 the satellite clinic of pediatric cardiology at Marien-Hospital of Witten was established. We also work as consultants in pediatric cardiology for the St. Elisabeth hospital group which is a regional provider of heath care and the largest provider of neonatal care in the Ruhr metropolitan area. The clinic is also a certified center for adults with congenital heart disease.

We provide the whole spectrum of non-invasive cardiology for patients of all ages. For adult patients we also provide facilities for invasive testing and treatment (cath lab).

Cardiology Associates of Dortmund CAD
M. Lehn, MD
Pediatric cardiologist and pediatrician
Specialist for Adults with Congenital Heart Disease

K. Kubisch, MD
M. Stratmann, MD
R. Kuhnert, MD
Y. Onay, MD
Osman Gürocak, MD
Cardiologists and Internal Medicine Associates

Main office:
Kampstrasse 45
44137 Dortmund
Phone: (+49) 231-95 80 89-0
Fax: (+49) 231–95 80 89-290

Satellite clinic at the
Marien-Hospital of Witten
Marienplatz 2
58452 Witten
Phone: (+49) 2302-173-0





Kampstrasse 45
44137 Dortmund, Germany


Satellite Clinic in Witten
Praxisfiliale am Marien-Hospital
Marienplatz 2
58452 Witten, Germany 

(+49) 231 95 80 89-0

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Cardiology Associates of Dortmund. Martin Lehn, MD. Phone: (+49/0) 231-95 80 89-0