What is Heart Block?

A healthy human heart beats at about 60 to 100 times a minute. A heartbeat is one contraction of the heart muscles, which pushes blood around the body.

Normally, every heart muscle contraction is controlled by electrical signals that travel from the atria, or the upper chambers of the heart, to the ventricles, or the lower chambers.

A partial heart block happens when the electrical impulses are delayed or stopped, preventing the heart from beating regularly.

A complete heart block is when the electrical signals stop completely. The heartbeat will drop to about 40 times per minute.

Even changes to impulses that last only a fraction of a second can cause heart block.

Sometimes, a heart block makes it difficult for the heart to pump blood properly through the circulatory system, so the muscles and organs, including the brain, do not get enough oxygen to function properly.

Heart block typically causes lightheadedness, fainting, and palpitations. Depending on the severity of the heart block, this can be dangerous. For example, a third-degree heart block can worsen pre-existing conditions, such as heart failure. It can cause loss of consciousness and even sudden cardiac arrest. There can also be chest pain.

Source: https://www.medicalnewstoday.com/articles/180986

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