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Type 1 second-degree heart block is considered more benign than type 2 second-degree heart block. [4] The type 1 does not have structural changes found on histology. Both types are named after Woldemar Mobitz. [5] [6] Type I is also named after Karel Frederik Wenckebach, [7] and type II is also named after John Hay. [8] [9]
By contrast, an AV block occurs in the AV node and delays ventricular depolarization. The term "Wenckebach block" is also used for some heart blocks, and can refer to a second degree type I block in either the SA node or the AV node, however the ECG features of the two are quite distinctly different.
This is a shortened version of the seventh chapter of the ICD-9: Diseases of the Circulatory System. It covers ICD codes 259 to 282. The full chapter can be found on pages 215 to 258 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1.
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 .
ICD-10 is the 10th revision of the International Classification of Diseases (ICD), a medical classification list by the World Health Organization (WHO). It contains codes for diseases, signs and symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or diseases. [1]
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]
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]