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Heart block
A heart block is a disease in the electrical system of the heart. This is opposed to coronary artery disease, which is disease of the blood vessels of the heart. While coronary artery disease can cause angina (chest pain) or myocardial infarction (heart attack), heart block can cause lightheadedness, syncope (fainting), and palpitations. Additional recommended knowledge
Types of heart blockA heart block can be a blockage at any level of the electrical conduction system of the heart.
Clinically speaking, most of the important heart blocks are AV nodal blocks and infra-Hisian blocks. Types of SA nodal blocksThe SA nodal blocks rarely give symptoms. This is because if an individual had complete block at this level of the conduction system (which is uncommon), the secondary pacemaker of the heart would be at the AV node, which would fire at 40 to 60 beats a minute, which is enough to retain consciousness in the resting state. Types of SA nodal blocks include:
In addition to the above blocks, the SA node can be suppressed by any other arrhythmia that reaches it. This includes retrograde conduction from the ventricles, ectopic atrial beats, atrial fibrillation, and atrial flutter. The difference between SA node block and SA node suppression is that in SA node block an electrical impulse is generated by the SA node that doesn't make the atria contract. In SA node suppression, on the other hand, the SA node doesn't generate an electrical impulse because it is reset by the electrical impulse that enters the SA node. Types of AV nodal blocksThere are four basic types of AV nodal block:
Types of infra-Hisian blockInfrahisian block describes block of the distal conduction system. Types of infrahisian block include:
Of these types of infrahisian block, Mobitz II heart block is considered most important because of the possible progression to complete heart block. See also
References
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Heart_block". A list of authors is available in Wikipedia. |
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