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Prof. Dr. med. Knut Kroger image

Department of angiology

Prof. Dr. med. Knut Kroger
internal medicine, angiology

About the department

The department of angiology at Helios Hospital Krefeld specializes in diagnosing and treating all diseases of the arteries, veins, and lymphatics diseases. Accurate diagnosis is the key to successful treatment, so the department has all the necessary modern equipment. Colour-coded duplex ultrasonography is the most critical imaging technique for diagnosing vascular diseases. In addition, doctors use magnetic resonance angiography. Both procedures stress the patient's body neither with X-rays nor with the administration of a contrast medium. After the diagnosis is made, a highly qualified medical team selects an individual set of therapeutic measures. In the early stages of the disease, the department's specialists can prescribe conservative therapy and lifestyle changing. 

Of particular interest to the department are circulatory disorders, obliterating diseases of peripheral vessels, thrombosis, Raynaud's syndrome, and diabetic foot syndrome. Depending on the stage and symptoms of the disease, the patient has been prescribed either outpatient or inpatient treatment. A team of hemostasiologists selects the optimal drugs or a combination of several medications to thin the blood or inhibit blood clotting.

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Treatment and diagnostic focus of the department


  • Peripheral arterial occlusive disease (PAOD)
  • Raynaud syndrome
  • Vein thrombosis
  • Diabetic foot syndrome
  • Chronic venous insufficiency
  • Atherosclerosis 
  • Peripheral artery disease
  • Blood clots in veins (VTE) 
  • Lymphedema 
  • Varicose veins


  • Anamnesis
  • Physical examination
  • Laboratory and biochemical analysis
  • Capillary microscopy (a non-invasive technique for measuring red blood cell velocity)
  • Colour-coded duplex ultrasonography
  • Magnetic resonance angiography
  • Finger pressure measurement
  • Catheter angiography (a minimally invasive test that uses x-rays and a contrast material to produce pictures of blood vessels)
  • CT angiography 
  • Ankle-brachial index (ABI) 


  • Conservative therapy (drug therapy) 
  • Revascularisation procedures
  • Surgical removal of a blood clot
  • Catheter implantation
  • Arterectomies 
  • Angioplasty 
  • Veins ablation 
  • Stenting
  • Open surgery
  • Bypass or stent-graft surgery 
  • Compression therapy
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Doctor profile


  • 1989 License for medical practice
  • 1992 ECFMG exam
  • 1995 Medical Specialist in Internal Medicine
  • 1995 Additional qualification in the field of sports medicine
  • 2001 Specialist in the field of Health Economics
  • 2003 Defense of doctoral thesis


  • 1989 - 1991 Johannitter Duisburg-Reinhausen Clinic
  • 1991 - 1994 General Hospital Viersen
  • 1994 - 2008 Department of Angiology, University Hospital Essen
  • Since 2009 Head of the Department of Angiology at the Helios Clinic Krefeld

Awards, memberships, publications

  • Board Member of the Initiative Chronische Wunden
  • Board Member of the German-Indonesian Society of Angiology
  • 2006 - 2008 Member of the Advisory Board of the German Angiology Society
  • Founding Member of the Federal Association for People with Peripheral Vascular Disease
  • 2014 - 2017 Member of the Council of the European Wound Management Association
  • Board Member of the Western Society of Angiology
  • German Society of Angiology
  • International Society of Angiology
  • American Society of Angiology
  • German Society of Cardiology
  • European Society of Cardiology
  • German Society of Ultrasound in Medicine
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