Glossary
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H
| Heart attack: |
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permanent damage to the heart muscle caused by a lack of blood supply to the heart for an extended time period. Some of the symptoms of a heart attack are similar to those of heartburn. |
| Heart block |
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A delay or complete block of the electrical impulse as it travels from the sinus node to the ventricles. The level of the block or delay may occur in the AV node or HIS-Purkinje system. The heartbeat may be irregular and slow. |