Packing for a flight can be overwhelming, especially when it comes to what is and isn't allowed in your carry-on bag. Among the items that spark the most confusion are batteries. They are ubiquitous, ...
There are three types of second degree heart block, also called atrioventricular (AV) block. In type I the signal sometimes does not reach the ventricles, causing skipped beats. It is often benign and ...
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