Is donating blood good or bad for the body?
From time to time, I can always met some news about "The blood bank is ischemic, the patient is in danger, and the patient in urgent need of XX type of blood, people who caring those blood type please come to donate blood"
But in fact, once it has been widely publicized by the media that blood stocks have been warned.
Unpaid blood donation should be normalized. When there is an emergency in the blood bank, it means that there is not enough blood for clinical use, and it need some time for media to advertise it and need to wait for people to donate. During the waiting period, the patient may be in danger at any time.
But when some blood donation even carry out in certain places such as shopping mall, the event always being reacted coldly by the public. Part of the reason is that everyone is always frightened about blood donation. There will be various questions such as "Will donating blood affect the body?" "Will donating blood cause obesity?"
So today, we are going to talk about these.
The so-called blood donation is to temporarily store the blood of healthy people for use by patients who need blood transfusion.
How much blood is in the human body?
The total blood volume of a normal person is equivalent to 7%-8% of body weight. Most of this blood rushes and circulates in the cardiovascular system, which is called circulating blood volume; a small part is retained in the liver, lungs, abdominal vena cava, subcutaneous vein and other places to prepare for rapid replenishment of circulation in critical situations such as massive bleeding. Blood volume. However, there is a limit to "just in case". If the patient loses 20%-25% of the blood in a short period of time, or there are blood diseases such as leukemia, blood problems will be induced and blood transfusions must be performed.
What is blood transfusion?
Blood transfusion is the blood components, namely plasma and blood cells.
The main component of plasma is water, followed by gases, electrolytes and small molecular organics. In addition, it also contains a certain amount of protein. Blood cells are constantly circulating, carrying out a "reconstruction-destruction-reconstruction" cycle. White blood cells, red blood cells, and platelets all have a certain life span, and the cycle of birth, aging, and death continues.
Secondly, the dose of blood donation (200ml, 400ml) is very low, far from reaching the 20%-25% warning line; healthy people are fully capable of recovering in a short time.
So what are people worrying about donating blood?
NO 1: Does blood donation affect immunity?
wrong.
The human body's immune system mainly includes three parts: a barrier composed of skin and mucous membranes, an innate defense system composed of phagocytes, and an acquired immune system composed of B cells and T cells. Phagocytes, B cells, and T cells are all white blood cells. White blood cells have a certain lifespan. After a certain period of time, the human body will destroy the white blood cells. At the same time, the bone marrow and other hematopoietic tissues are producing new white blood cells every moment.
Therefore, blood donation will not affect immunity.
NO 2: Donating blood may cause fainting?
Correct.
Blood donation may indeed cause fainting, which is often referred to as a blood donation reaction. In addition to fainting, blood donation reactions can also cause symptoms such as nausea, vomiting, pale complexion, palpitation, cold sweats, and chest tightness. However, overall, the incidence of blood donation reaction is very low, and it can be prevented with minor consequences. After receiving care, the patients returned to normal within a few minutes.
NO 3: Can't donate blood for high myopia?
Controversial.
Old version of the "Blood Donor Health Examination Standards" implemented in October 1998 stated that "patients with ophthalmological diseases, such as keratitis, optic neuritis, and high myopia with changes in the fundus," cannot donate blood.
However, the latest version of the 2011 "Blood Donor Health Examination Standards" has been revised, this part has been deleted, and it has been changed to "Those with active or progressive eye diseases who have recovered less than one week after the eye surgery. Those who have been 3 months old are listed as those who cannot donate blood temporarily.
Compared with normal people, patients with high myopia (greater than 600 degrees) have thinner blood vessels in the fundus, and blood flow is also reduced. Since the blood vessels of the human body are connected to each other, a slight change in blood pressure after blood donation may affect the blood vessels of the fundus, causing vasospasm of the fundus and the risk of retinal detachment.
Therefore, it is not high myopia that affects blood donation, but changes in the fundus. Although high myopia has a high probability of changing the fundus, it is not the only cause of abnormal fundus. If possible, it is best to perform a fundus examination before blood donation; if there is no condition and it happens to be high myopia, then, to be on the safe side, it is fine to not donate.
NO 4: Multiple blood donations will lead to obesity, blood pressure and other problems?
wrong.
After a single blood donation, the human body can recover quickly. The Red Cross, the government and other blood donation management organizations have also made strict regulations on the blood donation interval, leaving a sufficient recovery period for volunteers. In theory, multiple blood donations will not have an adverse effect on the human body.
In conclusion, blood donation has no long-term damage to healthy people. Blood is a precious medical resource. Guard your city. Don't wait for the blood bank to be in a hurry before donating blood. Let our city, 365 days, uninterrupted blood!
