Do you have to put in a heart stent for a 70% stenosis?
There are no obvious symptoms of myocardial ischemia or check FFR, if there is no abnormality you can leave it!
The implantation of cardiac stents never depends only on the degree of coronary stenosis, but also on the specific location of the patient's stenosis, the presence of myocardial ischemia, the severity of clinical symptoms, and associated high-risk complications.

Even considering only the degree of stenosis, 70% did not reach stenting!
If the patient has only 70% stenosis when considered from the perspective of the problem alone, and the other conditions are carried out to be ignored, then the situation is not really serious, but rather optimistic.
In fact, coronary heart disease only stenosis 50% - 100% of the concept of the interval, less than 50% of the stenosis can not be called coronary heart disease, but only a kind of coronary atherosclerosis pathological changes, so 70% of the stenosis in the clinical, only in the middle stage, and will not cause too much impact on the patient's life, and the life is not threatened, naturally, not There is no need for stent implantation.
After all, stenting is only a first aid measure, it only proceeds at the patient's stenosis terminal, temporary restoration, but there are advantages and disadvantages, stent implantation will damage the endothelium, in the long run will be more prone to the formation of plaque thrombosis, therefore, unless it is a last resort, stenting is generally not recommended, and for the stenosis is only 70% of the coronary artery disease patients, they seldom have a severe ischemia of the myocardium, so stenting does not provide any benefit, but rather a series of subsequent effects, so stenting is not recommended.

We need to distinguish between the purposes of interventions!
Not every measure is a cure.
In clinical practice, the numerous interventions fall into three main types of action: control, treatment, and first aid.
And stenting is typically an emergency measure for advanced, high-risk patients. If the patient has more than 90% stenosis and an acute heart attack, then this is the best and most appropriate time to stent or bypass.
As I said above, 70% of stenosis is only in the intermediate stage, and patients in this period should be controlled and treated at the same time. On the one hand, the progression of the disease should be slowed down by standardizing the diet and taking medication on a regular basis, and on the other hand, it is necessary to actively explore the responsible lesions and determine the root cause of the disease to carry out the causative treatment.
Inside the many formation factors, some of the factors can be avoided intervention, which means that this part of the patient can achieve the effect of clinical cure, they tend to have a certain degree of spinal lesions, and the pressure on the peripheral nerve stimulation, which makes the vascular spasm and contraction, when we are clear about the process of the lesion, it can be completely two-pronged treatment, so that the patient back to the old health.

I hope my science will help you!
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Depends on the circumstances:
With a 70% stenotic lesion, if it's in the left main trunk it's definitely time to put in a stent or do a coronary bypass or your life is at stake.
If it is in the anterior descending branch, the circumflex branch, or the right coronary artery, it is a critical lesion. Combined with the symptoms and other auxiliary tests, stent implantation can be considered if there is clear evidence of myocardial ischemia. Otherwise, it is not recommended.
In the case of bifurcation vessels in grade II and above, there is also generally no active intervention unless the bifurcation lesion is of relatively large vessel diameter.
Not there yet! Need more than 75%
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