Computers have a new tech called "Fuzzy Logic". I don't know exactly how it works but, it's not so definate like you stated. I found this Googleing:
ECG RHYTHM ADVISORY METHOD
These examples include simple combining rales or math, and expert systems utilizing fuzzy or standard logic, hi the example of expert systems utilizing standard logic, a programmer manually generates logical rules without uncertainty, the rules specifying preconditions such as "if measure A recommends defibrillation" and "if measure B recommends defibrillation", and if these preconditions are met, the AED 10 automatically defibrillates the patient. In the example of expert systems utilizing fuzzy logic, the rules are more "fuzzy" and the states to be combined incorporate some degree of uncertainty based on human language. For instance, the fuzzy logic rules can incorporate such input as "measure A detects a strong need for defibrillation" versus "measure A detects a weak need for defibrillation". The fuzzy logic framework combines the different measures and outputs results such as "strong need for defibrillation" or "weak need for defibrillation".
Here's the whole artical that can clairifiy it:
http://www.wipo.int/pctdb/en/wo.jsp?IA=WO2...mp;DISPLAY=DESC