To describe the natural history of a condition or disease. To describe the natural history of a condition or disease. To determine effectiveness or cost effectiveness of treatments/services and/or health care products. To measure or monitor safety and harm. To measure quality of care.
According to the NMSS, attacks or flare-ups of symptoms only qualify as exacerbations if: 1  they occur at least 30 days from an earlier flare-up. 2  symptoms last for 24 hours or longer.
How long does a BOTOXÂ® injection last? You can expect the effect of your BOTOXÂ® treatment to last anywhere from four to six months. As acetylcholine production returns to normal, your muscles will once again begin to contract and the wrinkles will reappear. That's the bad news. The good news is that your wrinkles may be less prominent after BOTOXÂ® treatment because your muscles may be somewhat trained to be in the more relaxed state. As the wrinkles reappear, you will have to have repeat BOTOXÂ® treatments to get them to disappear again.