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 it last for? Botox lasts up to 3-4 months initially but each case is different. A two week reassessment is always good to assess the effect and consider a top up if necessary in certain areas. The effects of Botox can last around 6 months or longer if used long term.