First degree AV block causes: Difference between revisions
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==Overview== | ==Overview== | ||
An atrioventricular block (or AV block) is a type of [[heart block]] involving an impairment of the conduction between the [[atria]] and [[ventricles]] of the heart.<ref>{{Dorlands|b_16|12188991}}</ref> It usually involves the [[atrioventricular node]], but it can involve other structures too. AV block is categorized by degree and site of conduction block. In first-degree AV block, all atrial impulses are conducted to the | An atrioventricular block (or AV block) is a type of [[heart block]] involving an impairment of the conduction between the [[atria]] and [[ventricles]] of the heart.<ref>{{Dorlands|b_16|12188991}}</ref> It usually involves the [[atrioventricular node]], but it can involve other structures too. AV block is categorized by degree and site of conduction block. In first-degree AV block, all atrial impulses are conducted to the ventricles; however, there is a delay in conduction within the [[AV node]] resulting in a [[prolonged PR interval]] on [[ECG]] (>200 msec or >5 small blocks). In other words, first degree block is a slowed conduction without loss of atrioventricular synchrony. | ||
==Causes== | ==Causes== | ||
Revision as of 15:25, 22 August 2013
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First degree AV block Microchapters |
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First degree AV block causes On the Web |
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American Roentgen Ray Society Images of First degree AV block causes |
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Risk calculators and risk factors for First degree AV block causes |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]; Raviteja Guddeti, M.B.B.S. [3]
Synonyms and keywords:; AV block, atrioventricular block, heart block
Overview
An atrioventricular block (or AV block) is a type of heart block involving an impairment of the conduction between the atria and ventricles of the heart.[1] It usually involves the atrioventricular node, but it can involve other structures too. AV block is categorized by degree and site of conduction block. In first-degree AV block, all atrial impulses are conducted to the ventricles; however, there is a delay in conduction within the AV node resulting in a prolonged PR interval on ECG (>200 msec or >5 small blocks). In other words, first degree block is a slowed conduction without loss of atrioventricular synchrony.
Causes
Life Threatening Causes
Life-threatening conditions can result in death or permanent disability within 24 hours if left untreated.
Common Causes
- Hyperkalemia
- Hyperthyroidism
- Increased vagal tone (e.g. sleep, athletes)
- Ischemic heart disease
- Medications ( e.g. adenosine, amiodarone, beta-blockers, diltiazem, procainamide, verapamil)
Causes by Organ System
Causes in Alphabetical Order
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