Determine Whether Vitamin A Enhances Immune Response

Several approaches have been taken in an attempt to determine whether Vitamin A supplementation enhances immune response and resistance or recovery from infection. In some investigations, researchers have attempted to correlate plasma concentrations of beta-carotene or retinol with immune response or susceptibility to infection. One limitation of this approach is related to the fact that plasma concentrations may have depressed plasma retinol levels as a result of disease. Therefore, it is not possible to establish whether low plasma retinol levels resulted in suppressed immune response or if plasma retinol levels decreased in response to disease or infection. Another approach used is to supplement the diet with retinol precursors and examine immune response at a later time point. This approach may be useful in examining the particular aspects of immunity that may be altered by supplementation, but additional studies are necessary to determine whether these effects have clinical significance in terms of disease outcome. Vitamin A has been fairly well studied in terms of its immunomodulatory effects, and we will review the evidence from randomized controlled trials as well as potential mechanisms of action. Vitamin A supplementation may afford some protection from infection in malnourished individuals, but the potential benefits of supplementation in normal wellnourished individuals remain to be established. There is evidence from several studies that suggests that vitamin A deficiency is associated with depressed immune function and an impaired response to influenza infection. Supplementation of vitamin A is associated with a reduction of mortality and morbidity among certain populations. It appears that populations suffering from malnutrition may benefit from adequate or additional vitamin A supplementation. However, it is less clear if normal, healthy, well-nourished individuals will benefit from additional supplementation with respect to enhanced immunity. The results from several studies involving beta-carotene supplementation in the diet of healthy individuals suggest that certain aspects of innate immunity, such as NK cytotoxicity and monocyte production of the cytokine TNFcx, are enhanced. It appears that lymphocyte subsets or the lymphocyte response to mitogens are not altered. In addition, one study of healthy older individuals found that vitamin A supplementation was associated with a reduction in the number of T lymphocytes. Whether these observed changes of immune function in response to supplementation actually result in reduced susceptibility to infection in healthy individuals is not well established. The results from one study demonstrated no association between vitamin A supplementation and incidence of bacterial infection. we are not aware of any long-term, randomized clinical trials that have evaluated the incidence of viral infection in response to supplementation with vitamin A alone. However, several studies have examined the possibility that supplementation with several multivitamins and or trace elements such as zinc, may alter susceptibility to infection. In general, the findings from these studies show no protection from infection in association with vitamin intake, but a slight decrease in the incidence of infection in those individuals consuming supplemental trace elements such as zinc and selenium. At this time, the potential benefits of vitamin A supplementation for healthy well-nourished individuals regarding susceptibility to infection remain to be established. A high beta-carotene intake has also been associated with a reduced risk of cancer. Earlier epidemiological studies suggested a high natural (fruits and vegetables) intake of beta-carotene was associated with reduced risk of cancer. However, more recent studies have not observed any benefit of beta-carotene intake on incidence of cancer and two studies actually observed an increased incidence of lung cancer in those participants consuming beta-carotene supplements. The presence of other carotenoids in fruits and vegetables has been suggested to be the protective factor in regards to cancer incidence in the early epidemiological studies based on the findings from these recent studies, dietary supplementation with high doses of synthetic beta-carotene may be contraindicated for smokers. As a reminder, it has been known for some time that a high intake of vitamin A results in adverse effects (neurologic, dermatologic, musculoskeletal, gastrointestinal, birth defects) and the results from the most recent studies suggest a potential risk of high doses of synthetic beta-carotene in certain populations. At this time it is probably safest to follow the National Cancer Institute recommendations that suggest five or more servings of fruits and vegetables per day. Immune Effects and Exercise We are currently aware of only one study that has examined whether vitamin A supplementation is associated with a reduced incidence of infection in athletes. Several studies have shown that the risk of upper respiratory infection is increased following competition in marathons or ultramarathons However, vitamin A supplementation before marathon competition did not reduce the incidence of infection in the postrace period. Therefore, to our knowledge, vitamin A supplementation has not been associated with enhanced resistance to infection in healthy athletes.

Complete Information on Aortic supravalvular stenosis with Treatment and Prevention

Aortic supravalvular stenosis is a fixed kind of inborn left ventricular leakage parcel interference that occurs as a localized or a diffuse narrowing of the ascending aorta beyond the excellent edge of the sinuses of Valsalva. Severe left ventricular leakage parcel interference and coronary artery disease may too induce liberal dyspnea upon exertion, angina, and syncope in serious cases and may account for the morbidity in aortic supravalvular stenosis. Bacterial endocarditis can too induce mortality and morbidity in aortic supravalvular stenosis. The sporadic form of aortic supravalvular stenosis is the most common presentation. Patients may have associated peripheral pulmonary artery stenosis but show no other features of Williams syndrome.Aortic supravalvular stenosis may happen periodically, as an expression of elastin arteriopathy, or as region of williams syndrome, a hereditary disorder with autosomal predominant heritage. Sudden death can happen in raw patients with aortic supravalvular stenosis. However, this appears to be comparatively uncommon whole. Sudden death is more common with Williams syndrome and aortic supravalvular stenosis with diffuse peripheral pulmonary artery stenosis. Sudden death can occur in untreated patients with aortic supravalvular stenosis. However, this appears to be relatively rare overall. Patients with aortic supravalvular stenosis usually become symptomatic during childhood, but aortic supravalvular stenosis is usually identified during infancy in cases associated with Williams syndrome. The symptoms which are caused by supravalvar aorta constriction usually develop in childhood and do in small child time, however, some patients may develop symptoms in the second or third decade of life. Newborn infants with acute aortic stenosis present with signs of circulatory collapse, cyanosis, or congestive heart failure. Hypotension, tachycardia, respiratory distress, irritability, and poor peripheral perfusion are nonspecific signs of physiologic distress, RV hypertrophy will be present. Hepatomegaly may be present, as well peripheral edema and decreased peripheral pulses. Respiratory distress may be present. A condition known as Williams Synrome is associated with nearly half the cases of supravalvular aortic stenosis. Cardiac silhouette may be variably increased, and the ascending aorta may be asymmetrically dilated. The presence of both findings indicates hemodynamically significant aortic supravalvular stenosis.A suitable diagnosis of aorta supravalvular constriction cannot be made, and the patients and their families can observe continuation care badly. Surgery is primary treatment for supravalvar aorta constriction. Catheter intervention in the form of transcatheter balloon angioplasty has not been found to be an effective treatment because the relief in gradient across aortic supravalvular stenosis is usually small and transient. Immediate surgical intervention is necessary, and may come in the form of balloon valvuloplasty, this, however, may result in complications relating to the small size and age of the patient. Open repair under direct vision is usually preferred. Percutaneous arterial stenting has been used to correct peripheral vascular stenoses, while surgical correction, either with patch augmentation or tube graft replacement, is favored for supravalvular aortic stenosis.

Complete Information on Birt-Hogg-Dube syndrome

Birt-Hogg-dube syndrome (BHD) is a very rare human genetic disorder. It is characterized by hair follicle hamartomas, kidney tumors, and spontaneous pneumothorax. Birt-Hogg-Dube syndrome condition in which benign tumors develop in hair follicles on the head, chest, back, and arms. These tumors are called fibrofolliculomas. Other characteristic skin abnormalities are trichodiscomas and acrochordons. A trichodiscoma is a tumor of the hair disc while an acrochordon is a skin tag. BHDS is uncommon in the United States. Several families have been reported since Birt, Hogg. BHDS may result from the inactivation of a tumor suppressor gene, which results in the cutaneous hamartomas associated with internal neoplasia. Recently, the BHDS gene locus has been localized to chromosome 17p11.2. The condition is characterized by multiple noncancerous tumors of the hair follicles, particularly on the face, neck, and upper chest. These growths typically first appear in a person’s twenties or thirties. Additionally, affected individuals have a higher chance of developing cysts in the lungs and an abnormal collection of air in the chest cavity (pneumothorax) that may result in the collapse of a lung.Mortality and morbidity associated with BHDS may be related to comorbid factors, such as renal cell carcinoma, pulmonary cysts, and spontaneous pneumothoraces. Treatment for patients with Birt-Hogg-Dube syndrome includes screening and management of pulmonary, renal, and gastrointestinal findings. In addition, skin findings may be treated for cosmetic concerns. Options for removal of these lesions include electrocautery, dermabrasion, and resurfacing with the carbon dioxide. Electrodesiccation may be helpful in removal of multiple lesions; however, lesions can recur.

Complete Information on Emery-Dreifuss muscular dystrophy with Treatment and Prevention

Emery-Dreifuss sinewy dystrophy is an uncommon and genetically heterogeneous disorder. The leading reason of mortality and morbidity in emery dreifuss sinewy dystrophy is cardiac disease, which is consistently existing. It usually begins in childhood or adolescence. In general the condition is less severe than many other forms of muscular dystrophy and though life expectancy may be shortened, many affected individuals can expect to reach middle age or older. Almost all people with Emery dreifuss muscular dystrophy have heart problems by adulthood. In many cases, these heart problems stem from abnormalities of the electrical signals that control the heartbeat and abnormal heart rhythms. The disorders affect different muscles and have different ages of onset, severity and inheritance patterns.Onset is normally in the teenage years, but the circumstance can submit with neonatal hypotonia or through the third decade. Patients typically produce failing of peroneal muscles with toe-walking recently in the best decade or in the earlier teenage years. Among the earliest features of this disorder are joint deformities called contractures, which restrict the movement of certain joints. Contractures become noticeable in early childhood and most often involve the elbows, ankles, and neck. The condition is inherited and can therefore affect other family members. In many families it is inherited as a X linked trait and therefore only affects males and is carried by unaffected females. All the sons of an affected male will be unaffected but all his daughters will be carriers. Most affected individuals also experience slowly progressive muscle weakness and wasting, beginning in muscles of the upper arms and lower legs and progressing to muscles in the shoulders and hips.No particular handling for emery dreifuss sinewy dystrophy exists. Aggressive positive maintenance is vital to maintain muscle action, to offer for maximal utilitarian power, and to extend living expectancy. However, having a sufficient diet and maintaining better general health are really significant as in all sinewy dystrophies. Females who carry one altered copy of the EMD gene usually do not experience the muscle weakness and wasting that are characteristic of this condition. In some cases, however, they may experience heart problems associated with this disorder. Orthopedic surgery may be needed to correct or prevent contractures and to increase range of motion. Regular gentle exercise, which is tolerated without causing stress, is beneficial. But hard physical exercise should be avoided. Antithromboembolic drugs are probably required to prevent cerebral thromboembolism of cardiac origin.