What does 'haemodynamically significant stenosis' mean?
A haemodynamically significant stenosis describes a narrowing of a blood vessel that restricts blood flow so much that it causes a noticeable reduction in circulation. The word 'haemodynamic' refers to how blood flows through the body, while 'stenosis' simply means a narrowing or constriction.
When blood can no longer flow freely
Blood vessels carry oxygen and nutrients to the organs and tissues throughout the body. Sometimes, substances such as fat or calcium build up on the inner walls of arteries, which are the vessels that carry blood from the heart to the rest of the body. This can cause the vessel to gradually narrow. These narrowings are called stenoses.
Not every stenosis is automatically a problem. It is only when the narrowing is severe enough to significantly reduce blood flow and leave the tissue beyond it without enough supply that we speak of a haemodynamically significant stenosis. This means the narrowing is serious enough to measurably or noticeably disrupt circulation.
Where do these narrowings most commonly occur?
Haemodynamically significant stenoses are often found in the coronary arteries of the heart, the carotid arteries in the neck, or the arteries of the legs. Things become especially critical when vital organs such as the heart or brain are affected, as these depend on a constant and adequate blood supply.
In the coronary arteries, such a narrowing can lead to chest pain or even a heart attack if the heart is no longer receiving enough oxygen. In the carotid arteries, it can increase the risk of a stroke. In the legs, a significant stenosis often causes pain when walking, because the muscles are no longer receiving enough blood.
How is it determined whether a stenosis is haemodynamically significant?
Not every narrowing needs to be treated straight away. What matters is how much the blood flow is actually affected. To find this out, doctors use a range of tests. Imaging methods such as ultrasound, computed tomography (CT), or magnetic resonance imaging (MRI) are commonly used to make the narrowing visible.
In addition, special measurements can be used to check how much blood is still flowing through the narrowed vessel. During cardiac catheterisation, for example, the so-called pressure drop before and after the narrowing is measured. If the difference is large, the stenosis is considered haemodynamically significant. Stress tests, in which the heart or legs are observed under physical exertion, also give clues as to whether the narrowing is genuinely affecting circulation.
What does this mean for your health?
A diagnosis of haemodynamically significant stenosis often causes worry. The question arises as to whether the narrowing is dangerous or even poses immediate risks. In fact, the risk depends mainly on where the stenosis is located and how much it restricts blood flow.
In the heart, such a narrowing can lead to angina pectoris (chest tightness) or, in the worst case, a heart attack if a vessel suddenly becomes completely blocked. In the carotid arteries, the danger of a stroke increases because small blood clots can be carried through the narrowing into the brain. In the legs, insufficient blood supply can cause pain, wounds, or in extreme cases, the death of tissue.
Typical symptoms and warning signs
A haemodynamically significant stenosis does not always make itself known straight away. Symptoms often only appear during physical activity, because the body then needs more blood. Typical symptoms include chest pain, shortness of breath, pain or weakness in the legs when walking, or sudden visual disturbances and speech problems when the carotid arteries are affected.
If such warning signs persist or keep coming back, a doctor should be seen as soon as possible. The earlier a significant stenosis is identified, the better complications can be prevented.
Treatment options for significant narrowings
Treatment always depends on how much the blood flow is restricted and which vessels are affected. Medication can often achieve a great deal. Blood thinners, medicines to lower blood pressure or cholesterol, and drugs that reduce the workload on the heart are among the standard measures.
If the narrowing is very pronounced or symptoms persist despite medication, procedures may sometimes be considered. In the coronary arteries, for example, a stent can be inserted, which is a small support structure that keeps the vessel open. In other parts of the body, balloon catheters or vascular prostheses can also be used to address the narrowing. In some cases, surgery is necessary, such as bypass surgery on the heart or an endarterectomy of the carotid artery.
It is important that the decision for or against treatment is always made on an individual basis. Not every narrowing needs to be treated immediately; what matters is how great the risk of complications is and how severe the symptoms are.
What can you do yourself?
Your own lifestyle also plays an important role. Eating a balanced diet, exercising regularly, giving up smoking, and managing risk factors such as high blood pressure or diabetes well can all help to slow the progression of vascular narrowings. Even small changes in daily life can help to maintain the health of your blood vessels and reduce the risk of serious consequences.
A haemodynamically significant stenosis is therefore more than just a narrowing in a vessel. It shows that circulation at a particular point is so severely restricted that action is needed, whether through medication, a procedure, or targeted lifestyle changes.
