What happens when blood vessels are stimulated by cold? Doctor: It may have these effects, it is very important to keep warm!

Every winter and spring are high-risk periods for cardiovascular and cerebrovascular diseases.

　　Especially after entering the spring, many people who already have three high diseases tend to relax their vigilance against cardiovascular and cerebrovascular diseases, thinking that the incidence rate will decrease after the temperature warms up. As everyone knows, spring is also a dangerous period, which is directly related to the unstable temperature.

　　Because it seems that the temperature during the day has warmed up in spring, but for most areas in the north, the temperature difference between day and night is relatively large. Snow is also very common after Jingzhe, and the temperature is not stable enough. Whether it is a large temperature difference, a dry climate, air pressure or wind speed, they are all in a state of fluctuation, which can cause irritation to the blood vessels.

　　So the question is, what happens when the blood vessels are stimulated by cold?

　　1. Increased blood pressure

　　In fact, the blood vessels inside the human body are the most sensitive to temperature changes . If you are in a warm room, your blood vessels are dilated and relaxed.

　　However, if you suddenly enter a cold room from the outside, the temperature of the space is very different, and you do not do a good job of keeping warm, the cold will directly stimulate the blood vessels , resulting in vasospasm and contraction . At the same time, the cold will also stimulate the sympathetic nerves , increase the blood pumping burden of the heart , and cause a sudden increase in blood pressure;

　　2. stroke

　　This condition is often based on atherosclerosis. After suddenly entering the cold outside, the blood vessels tend to spasm and constrict strongly, and the blood circulation speed is accelerated . If the patient 's cerebral blood vessels have poor elasticity, aneurysm or aneurysm formation , it is easy to cause the rupture of the blood vessel or aneurysm, and then induce hemorrhagic stroke .

　　In addition, irritation from vasospasm may cause unstable plaque to slough off the arterial wall . These plaques often quickly stimulate the blood coagulation system, leading to thrombosis . Once the thrombus blocks the carotid artery or vertebral artery , it will cause sudden ischemic stroke, which is commonly known as cerebral infarction;

　　3. Myocardial infarction

　　In cold weather, in order to maintain the basal body temperature, most of the blood in the human body will flow into the internal organs. This change often increases the beating frequency of the heart and increases the burden on the heart to pump blood.

　　At the same time, after being stimulated by cold, it will also lead to excessive contraction and spasm of coronary arteries and increase blood pressure . Patients with pre -existing coronary heart disease may suffer from angina pectoris.

　　If the coronary artery is excessively narrowed and thrombosis occurs, coronary blood flow will be interrupted, and then acute myocardial infarction will be induced. Once the patient is not treated in time, it may develop into heart failure , shock, and sudden death in a short period of time;

　　4. Aortic dissection

　　This situation basically occurs in hypertensive patients, especially hypertension combined with atherosclerosis accounts for about 70-80% of all patients.

　　The reason for this is that high blood pressure can cause the arterial wall to be under stress for a long time, and the elastic fibers are prone to cystic degeneration or necrosis. Affected by the cold weather, the damage of the blood vessel wall will be accelerated, and the blood flow will easily enter the torn middle and inner layers, and then induce aortic dissection.

　　It is not difficult to see from the above content that cold weather has a great impact on blood vessels, especially for patients with underlying diseases who suddenly enter cold temperatures and even cause sudden onset of cardiovascular and cerebrovascular diseases.

　　Therefore, everyone should do a good job of keeping warm in daily life and avoid cold temperature or cold water stimulation. After the occurrence of the primary disease, the doctor should cooperate with the doctor to carry out the relevant treatment.