Aunt Wang is 57 years old. She is usually in good health and is a good farmer at home. However, she was admitted to our hospital for fainting the other day.
Looking back on the course of the disease, Aunt Wang was squatting in the yard peeling corn. At that time, the neighbors came to visit. She stood up and wanted to open the door, but suddenly felt dark in front of her eyes, her head was dizzy, and then fell down. Aunt Wang said that the days before she fainted were also abnormal. She was fine when she squatted to work, but when she stood up, she felt black in front of her eyes, but she could recover in a few minutes. Unexpectedly, she fainted this time.
Clinically, it is not uncommon to see such a situation as Aunt Wang. After squatting for a long time, I feel black in front of me. What's the matter? Today, let's talk about it in detail.
Most of the blackening problems are here
In fact, the eyes darken, which is the manifestation of cerebral ischemia. From squatting to standing up, this is a change of posture, which will affect the distribution of human blood.
When the human body squats or sits for a long time, the blood vessels of the lower limbs are compressed, and the blood circulation is blocked. At this time, it suddenly stands up, and the pressure of the blood vessels of the lower limbs is relieved at once. Due to gravity, the whole body blood quickly flows to the waist and legs. In this way, the amount of blood flowing back to the heart will be reduced, the blood pressure will drop, and the upper body, especially the brain, is prone to ischemia.
For normal people, at this time, the blood pressure regulation mechanism will be immediately activated in the body to speed up the heartbeat, strengthen the heart contraction, raise blood pressure, and deliver more blood to the whole body to avoid insufficient blood supply. If there is a problem in the regulation process due to some reasons, the blood pressure will drop suddenly from squatting to standing, resulting in transient brain blood supply insufficiency, and then temporary blackness (blackness), dizziness, even syncope and other symptoms will appear.
When the body position changes and blood pressure drops when standing fast, it is called "postural hypotension" in medicine.
These people are more prone to dizziness when squatting for a long time
Clinically, orthostatic hypotension is often screened by supine test. To put it simply, it is to measure the blood pressure changes in the supine and upright positions. If the systolic and diastolic blood pressure drops ≥ 20 mmHg or the diastolic blood pressure drops ≥ 10 mmHg within 3 minutes of standing up, it is necessary to suspect postural hypotension.
Generally speaking, people with weak physique, thin body, long-term inactivity or older age are prone to postural hypotension. In addition, postural hypotension may also occur in some diseases, such as cardiogenic shock caused by acute myocardial infarction, stress cardiomyopathy, brain tumor, cerebral infarction, carotid stenosis, etc.
Do you need to take medicine for "postural hypotension"?
However, even if you belong to the above vulnerable groups, don't worry too much. Pay more attention at ordinary times to avoid serious symptoms. In life, we should pay attention to these four details:
Slow down. When you change your position, do not stand up suddenly. Give your body a little reaction time.
Keep exercising more at ordinary times, which can strengthen the ability of blood pressure regulation in the body and reduce the risk of postural hypotension.
Regular work and rest should ensure sufficient sleep every day to avoid blood pressure fluctuations caused by staying up late.
Regular monitoring and timely medical treatment suggest that middle-aged and elderly people regularly monitor blood pressure in different positions at home. If there are temporary dizziness, blackness and other symptoms after changing the position, you can go to the cardiology department for further examination and diagnosis to eliminate other diseases. For patients with severe symptoms and frequent attacks, medication should be taken under the guidance of doctors.
Knock on the blackboard
Standing up for a long time, the eyes turn black, which is probably due to the symptoms of cerebral ischemia caused by postural hypotension.
The blood pressure of lying and standing positions can be measured at home to screen for orthostatic hypotension.
Changing posture to slow down, doing more exercise every day, forming normal work and rest habits, regularly monitoring blood pressure, finding symptoms and timely medical treatment can avoid serious events such as syncope and fall caused by postural hypotension.
