| Heart block Classification and external resources |
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| ICD-10 | I44.-I45. |
|---|---|
| ICD-9 | 426.9 |
| DiseasesDB | 10477 |
| MeSH | D006327 |
A heart block is a disease in the electrical system of the heart. The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify Diseases The International Statistical Classification of Diseases and Related Health Problems 10th Revision ( ICD -10) is a coding of diseases and signs symptoms abnormal findings I00-I99 - Diseases of the Circulatory system (I00-I02 Acute rheumatic fever ( Rheumatic fever without mention of Heart I00-I99 - Diseases of the Circulatory system (I00-I02 Acute rheumatic fever ( Rheumatic fever without mention of Heart The International Statistical Classification of Diseases and Related Health Problems (most commonly known by the abbreviation ICD) provides codes to classify Diseases The following is a list of codes for International Statistical Classification of Diseases and Related Health Problems. The Diseases Database is a free Website that provides information about the relationships between medical conditions Symptoms, and Medications. Medical Subject Headings ( MeSH) is a huge Controlled vocabulary (or metadata system for the purpose of indexing journal articles and books The normal electrical conduction in the heart allows the impulse that is generated by the Sinoatrial node (SA node of the Heart to be propagated to (and stimulate the The heart is a muscular organ in all Vertebrates responsible for pumping Blood through the Blood vessels by repeated rhythmic This is opposed to coronary artery disease, which is disease of the blood vessels of the heart. Coronary artery disease (CAD (or atherosclerotic Heart disease) is the end result of the accumulation of atheromatous plaques within the walls While coronary artery disease can cause angina (chest pain) or myocardial infarction (heart attack), heart block can cause lightheadedness, syncope (fainting), and palpitations. Angina pectoris, commonly known as angina, is severe Chest pain due to Ischemia (a lack of blood and hence Oxygen supply of the heart Myocardial infarction ( MI or AMI for acute myocardial infarction) also known as a heart attack, occurs when the blood supply A palpitation (medical term ectopic heart beat) is an abnormal awareness of the beating of the Heart, whether it is too slow too fast irregular
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Types of heart block
A heart block can be a blockage at any level of the electrical conduction system of the heart. The normal electrical conduction in the heart allows the impulse that is generated by the Sinoatrial node (SA node of the Heart to be propagated to (and stimulate the
- Blocks that occur within the sinoatrial node (SA node) are described as SA nodal blocks. The Sinoatrial node (abbreviated SA node or SAN, also called the sinus node) is the impulse generating (pacemaker tissue located in the Right atrium A sinoatrial block is a type of Heart block which involves an impairment of conduction at the Sinoatrial node.
- Blocks that occur within the atrioventricular node (AV node) are described as AV nodal blocks. The atrioventricular node (abbreviated AV node) is an area of specialized tissue between the atria and the ventricles of the Heart, specifically An atrioventricular block (or AV block) is a type of Heart block involving impairment of the conduction between the atria and ventricles of the heart
- Blocks that occur below the AV node are known as infra-Hisian blocks (named after the bundle of His). The bundle of His, also known as the AV bundle or atrioventricular bundle is a collection of heart muscle cells specialized for electrical conduction that transmits the electrical
- Blocks that occur within the left or right bundle branches are known as bundle branch blocks.
- Blocks that occur within the fascicles of the left bundle branch are known as hemiblocks.
Clinically speaking, most of the important heart blocks are AV nodal blocks and infra-Hisian blocks.
Types of SA nodal blocks
The 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. Consciousness has been defined loosely as a constellation of attributes of Mind such as Subjectivity, Self-awareness, Sentience, and the
Types of SA nodal blocks include:
- SA node Wenckebach (Mobitz I)[1]
- SA node Mobitz II
- SA node exit block
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. Cardiac ectopy or "ventricular extra beats" is a disturbance of the Electrical conduction system of the heart in which beats arise from the wrong part of the heart
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 blocks
There are four basic types of AV nodal block:
- First degree AV block
- Second degree AV block
- Type 1 second degree AV block (Mobitz I) (also known as Wenckebach phenomenon)
- Third degree AV block (Complete heart block)
Types of infra-Hisian block
Infrahisian block describes block of the distal conduction system. An atrioventricular block (or AV block) is a type of Heart block involving impairment of the conduction between the atria and ventricles of the heart First degree AV block or PR prolongation is a disease of the electrical conduction system of the Heart in which the PR interval is lengthened Second degree AV block is a disease of the electrical conduction system of the Heart. Third degree AV block, also known as complete heart block, is a defect of the electrical system of the Heart, in which the impulse generated in the atria (typically Types of infrahisian block include:
- Type 2 second degree heart block (Mobitz II)
- Left bundle branch block
- Left anterior fascicular block
- Left posterior fascicular block
- Right bundle branch block
Of these types of infrahisian block, Mobitz II heart block is considered most important because of the possible progression to complete heart block. Left bundle branch block (LBBB is a cardiac conduction abnormality seen on the Electrocardiogram (ECG A right bundle branch block ( RBBB) is a defect in the heart's electrical conduction system
See also
- Electrical conduction system of the heart
- Sinoatrial node (SA node)
- Atrioventricular node (AV node)
References
- ^ (November, 2000) Hurst's The Heart, 10th Edition. The normal electrical conduction in the heart allows the impulse that is generated by the Sinoatrial node (SA node of the Heart to be propagated to (and stimulate the The Sinoatrial node (abbreviated SA node or SAN, also called the sinus node) is the impulse generating (pacemaker tissue located in the Right atrium The atrioventricular node (abbreviated AV node) is an area of specialized tissue between the atria and the ventricles of the Heart, specifically Trifascicular block is a problem with the electrical conduction of the Heart. Lev's disease (or Lenegre-Lev syndrome) is an acquired Complete heart block due to idiopathic fibrosis and calcification of the electrical conduction system McGraw-Hill Professional Publishing, Figure 24-60b. ISBN 0071356959.
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