Symptoms of a third degree or complete heart block include feeling faint, being short of breath, extreme tiredness, sometimes with confusion and chest pain.

Healthcare providers categorize second-degree heart block subtypes—Mobitz type 1 and type 2—based on their physical signs on an electrocardiogram (ECG), which records the electrical activity ...

People can have a first-, second- or third- degree heart block. The first is the least severe while the third is the most severe. Doctors never uncovered why Seward had one at such a young age.