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Second-degree atrioventricular block (AV block) is a disease of the electrical conduction system of the heart.It is a conduction block between the atria and ventricles.The presence of second-degree AV block is diagnosed when one or more (but not all) of the atrial impulses fail to conduct to the ventricles due to impaired conduction.
The heart rate produced by the ventricles is much slower than that produced by the SA node. [1] Some AV blocks are benign, or normal, in certain people, such as in athletes or children. Other blocks are pathologic, or abnormal, and have several causes, including ischemia, infarction, fibrosis, and drugs.
Karel Frederik Wenckebach (Dutch: [ˈkaːrəl ˈfreːdərɪk ˌʋɛŋkəˈbɑx]; March 24, 1864 – November 11, 1940) was a Dutch anatomist who was a native of the Hague. He studied medicine in Utrecht , and in 1901 become a professor of medicine at the University of Groningen .
Types of SA nodal blocks include: SA node Wenckebach (Mobitz I) [4] 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. [citation needed]
426.13 Atrioventricular block, Wenckebach's; 426.3 Bundle branch block, left; 426.4 Bundle branch block, right; 426.6 Sinoatrial heart block; 426.7 Atrioventricular excitation, anomalous Wolff-Parkinson-White syndrome; 427 Cardiac dysrhythmias. 427.0 Tachycardia, paroxysmal supraventricular; 427.3 Atrial fibrillation and flutter. 427.31 Atrial ...
Ashman beats are described as wide complex QRS complexes that follow a short R-R interval preceded by a long R-R interval. [3] This short QRS complex typically has a right bundle branch block morphology and represents an aberrantly conducted complex that originates above the AV node, rather than a complex that originates in either the right or left ventricle.
An intraventricular block is a heart conduction disorder — heart block of the ventricles of the heart. [1] An example is a right bundle branch block, right fascicular block, bifascicular block, trifascicular block. [2] [3]
The cause of congenital third-degree heart block in many patients is unknown. Studies suggest that the prevalence of congenital third-degree heart block is between 1 in 15,000 and 1 in 22,000 live births. [citation needed] Hyperkalemia in those with previous cardiac disease [8] and Lyme disease can also result in third-degree heart block. [9]