Lymphoid tissue: T-lymphocytes and the Thymus The thymus is a primary lymphoid organ found within the superior mediatinum, behind the upper part of the sternum. This organ is active in children, but at the start of puberty, until old age, it starts to atrophy, producing fewer T-cells.
2. Increased risk of infection. PROGRAF is a medicine that affects your immune system. Prograf can lower the ability of your immune system to fight infections. Serious infections can happen in people receiving Prograf that can cause death. Call your doctor right away if you have symptoms of an infection such as: 1  fever.2  sweats or chills.3  cough or flu-like symptoms. 4  muscle aches. 5  warm, red, or painful areas on your skin.erious infections can happen in people receiving Prograf that can cause death. Call your doctor right away if you have symptoms of an infection such as: 1  fever. 2  sweats or chills. 3  cough or flu-like symptoms. 4  muscle aches. 5  warm, red, or painful areas on your skin.
Question: What effects does spironolactone have on my blood potassium and should I be monitored while on it? Answer: Because spironolactone is commonly used in heart failure treatment, its effects on your kidneys are really important. It turns out that spironolactone causes the kidney to retain or hang on to potassium. And it can increase the blood potassium level, and in some patients actually quite significantly, and even in a few to dangerous levels. So with a new addition of spironolactone to your medical regimen, the blood potassium level should be monitored. Initially the first few days after starting it, and then every couple of weeks for probably a month or two to make sure that your blood potassium levels are okay and are not too elevated.