In the pediatric patient, we could always hear the parents with a baby asked the doctor: "My children do not lack of calcium?." The so-called calcium deficiency that is due to a lack of vitamin D caused by abnormal calcium and phosphorus metabolism in vivo, resulting in poor bone calcification caused by developmental abnormalities caused by bone lesions, the formation of vitamin D deficiency rickets.
What then is the vitamin D do? What it do? Vitamin D is a steroid derivative, with anti-rickets effect, it called the anti-rickets vitamin. Many different types of vitamin D, which are the more important of vitamin D2 (curing alcohol) and vitamin D3 (alcohol curing lamps). Vitamin D and vitamin A often coexist in the cod liver oil, but also in the liver, milk, egg yolk. Subcutaneous tissue in the body of 7 - dehydrocholesterol (vitamin D3 original), or ultraviolet radiation in sunlight, it can be transformed into vitamin D3. Contain vegetable oil and yeast ergosterol, by ultraviolet radiation can be converted into vitamin D2. Can also be synthetic vitamin D2.
Vitamin D2 and D3 structures are very similar, both soluble in fats, oils and organic solvents such as ether, should not be in the water, it is known as the fat-soluble vitamins. Vitamin D on the air and light sensitive, especially when the heating is more susceptible to damage and should be stored in dark environments.
Injection and oral vitamin D are easily absorbed into the blood circulation after absorption, with the blood flow into the liver or to enter into muscle, adipose tissue storage. Vitamin D in the liver cells first into a 25 - hydroxy vitamin D3, vitamin D3 which is in the blood circulation in the main form has a certain anti-rickets activity; into the blood circulation of 25 - hydroxy vitamin D3 in the kidney into a further 1, 25 - dihydroxy vitamin D3, vitamin D This is the hormone-like substances. It can thus be seen, liver, renal dysfunction will affect the process of hydroxylation of vitamin D, which is the liver, and renal causes of rickets.
The physiological function of vitamin D to promote calcium absorption in the intestine, promoting renal reabsorption of calcium and phosphorus to calcium, phosphorus concentrations increased; In addition, in common with the in vivo role of other hormones, promote the absorption of old bone, that is, dissolving the calcium of bone will be transferred to the blood calcium and phosphorus, so that the concentration of blood calcium and phosphorus, which is beneficial to calcium in the formation of new bone parts calm, so that the role of enhanced ossification and promote bone tissue calcification, which is Infant bone growth factor can not be lack of nutrition.
Normal pediatric daily requirements of vitamin D of 400-800 units. The source of the human body vitamins there are two ways First, in mice, by ultraviolet radiation in human skin so that 7 - dehydrocholesterol into vitamin D3. Another way is outside the iatrogenic, that is, the food intake of vitamin D.
Often a lack of vitamin D was due to the following aspects: ① by inadequate food intake; ② insufficient sunlight; ③ intestinal malabsorption; ④ grow too fast, the required vitamin D and more.
Although vitamin D to regulate calcium metabolism plays an important role, but it can not be too much use, so as to avoid vitamin D intoxication.>
What then is the vitamin D do? What it do? Vitamin D is a steroid derivative, with anti-rickets effect, it called the anti-rickets vitamin. Many different types of vitamin D, which are the more important of vitamin D2 (curing alcohol) and vitamin D3 (alcohol curing lamps). Vitamin D and vitamin A often coexist in the cod liver oil, but also in the liver, milk, egg yolk. Subcutaneous tissue in the body of 7 - dehydrocholesterol (vitamin D3 original), or ultraviolet radiation in sunlight, it can be transformed into vitamin D3. Contain vegetable oil and yeast ergosterol, by ultraviolet radiation can be converted into vitamin D2. Can also be synthetic vitamin D2.
Vitamin D2 and D3 structures are very similar, both soluble in fats, oils and organic solvents such as ether, should not be in the water, it is known as the fat-soluble vitamins. Vitamin D on the air and light sensitive, especially when the heating is more susceptible to damage and should be stored in dark environments.
Injection and oral vitamin D are easily absorbed into the blood circulation after absorption, with the blood flow into the liver or to enter into muscle, adipose tissue storage. Vitamin D in the liver cells first into a 25 - hydroxy vitamin D3, vitamin D3 which is in the blood circulation in the main form has a certain anti-rickets activity; into the blood circulation of 25 - hydroxy vitamin D3 in the kidney into a further 1, 25 - dihydroxy vitamin D3, vitamin D This is the hormone-like substances. It can thus be seen, liver, renal dysfunction will affect the process of hydroxylation of vitamin D, which is the liver, and renal causes of rickets.
The physiological function of vitamin D to promote calcium absorption in the intestine, promoting renal reabsorption of calcium and phosphorus to calcium, phosphorus concentrations increased; In addition, in common with the in vivo role of other hormones, promote the absorption of old bone, that is, dissolving the calcium of bone will be transferred to the blood calcium and phosphorus, so that the concentration of blood calcium and phosphorus, which is beneficial to calcium in the formation of new bone parts calm, so that the role of enhanced ossification and promote bone tissue calcification, which is Infant bone growth factor can not be lack of nutrition.
Normal pediatric daily requirements of vitamin D of 400-800 units. The source of the human body vitamins there are two ways First, in mice, by ultraviolet radiation in human skin so that 7 - dehydrocholesterol into vitamin D3. Another way is outside the iatrogenic, that is, the food intake of vitamin D.
Often a lack of vitamin D was due to the following aspects: ① by inadequate food intake; ② insufficient sunlight; ③ intestinal malabsorption; ④ grow too fast, the required vitamin D and more.
Although vitamin D to regulate calcium metabolism plays an important role, but it can not be too much use, so as to avoid vitamin D intoxication.>
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