AED - Automated External Defibrillator. They're portable device defibrillator which can deliver an electric shock. As I understand it, it detects an abnormal heart rhythm and shocks the rhythm back to normal. Note that there are some situations where they will not work. (For example, Pulseless Electrical Activity or PEA is "non-shockable.")

AED: Automatic External Defibrillator, a defibrillator that doesn't need a trained operator

Aspirin: a blood thinner and painkiller

Blood thinners: given to people at risk of a heart attack to thin the blood and reduce the chance of blood flow being obstructed

IIRC in the King's English:

aspirin = acetylsalicylic acid

blood thinners = anticoagulants

They are called AEDs in the UK too