Ventricular fibrillation is one type of arrhythmia that can be deadly. It occurs when the heart beats with rapid, erratic electrical impulses. This causes pumping chambers in your heart (the ventricles) to quiver uselessly instead of pumping blood. Without an effective heartbeat, blood pressure plummets, cutting off blood supply to your vital organs.
In the ABO system, (and Rhesus D system) all blood belongs to one of four major groups: A+/â, B+/â, AB+/â, or O+/â. The presence (+) or absence (â) of the RhD (Rhesus D) antigen is indicated by the plus or minus following the ABO type. But there are more than two hundred minor blood groups that can complicate blood transfusions. These are known as rare blood types.
You inherit your blood type from a mix of your parentsâ genes. There are eight main blood types, organised through two combined systems. These systems are ABO (blood types A, B, AB or O) and Rhesus type or group (positive or negative). Your blood type is a combination of these two systems. For example, by percentage of population, the most common blood type in Australia is O positive and the least common is AB negative.