“The algorithm continuously samples the pulse data in 5-minute blocks, which by design are overlapping by 50%,” Lubitz said. “If 11 out of 11 consecutive blocks, or tachograms, are irregular ...

In some individuals, first-degree heart block or Mobitz type 1 second-degree heart block are a normal variant, meaning there is no underlying health problem. This is typically seen in young athletes.

Heart block is the disruption of the electrical energy flow from your heart’s upper chambers (atria) to the lower chambers (ventricles). If it’s a minor disruption, you may not need treatment.

Dr. Paul Friedman answers the question: 'Heart Block versus Artery Blockage?' — -- Question: I have been diagnosed with heart block. How does this differ from blockage in one of my arteries ...

Second-degree heart block is a condition in which the impulses from the atria occasionally fail to reach the ventricles. Heart blocks may also be called atrioventricular (AV) blocks.

But heart block in later life can progress to a more serious form, called second-degree heart block, which can cause dizziness, fainting, and increase likelihood of needing an electronic pacemaker ...

Third degree heart block occurs when the electrical signal from the heart’s atria, or top chambers, cannot reach the ventricles, or bottom chambers. Without treatment, the heart may eventually stop.

This affects heart rhythm. Doctors can determine the type of heart block by checking the rhythm and electrical activity of a person’s heart using an electrocardiogram (EKG).