The chance of a reaction to the contrast material is a very small, but potentially significant risk. It is estimated that only 5–10% of patients experience any effect from contrast exposure. The vast majority of reactions are mild, such as sneezing, nausea, or anxiety. These usually resolve by themselves. A moderate reaction, like wheezing or hives, may be treated with medication, but is not considered life threatening. Severe reactions, such as heart or respiratory failure, occur very infrequently, and require emergency medical treatment.
CDC complies with two privacy laws. One is healthcare-related and the other is business-related. In Alberta, when personal information is collected, used or disclosed in the course of providing publicly-funded healthcare services it is covered by the Health Information Act (HIA). At the same time, the Personal Information Protection Act (PIPA) protects personal information collected, used or disclosed by private-sector companies, including CDC. In practice, the requirements of these laws are reasonably similar and can be satisfied at the same time. Where standards differ, we meet the higher one.