If you’ve taken a CPR or First Aid course recently you’ve probably noticed a new addition to all of our programs – the Automated External Defibrillator (AED). What exactly this little machine does, and why and when we use it may seem a little overwhelming if you’re new to it, so I thought I’d write a series of posts all about how an AED actually works to help clarify things. Let’s start off by talking about how the heart works.

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