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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.
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.
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.
426.0 Atrioventricular block, third degree. 426.11 Atrioventricular block, first degree; 426.12 Atrioventricular block, Mobitz II; 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 ...
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]
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 .
A sinoatrial block (also spelled sinuatrial block) [1] is a disorder in the normal rhythm of the heart, known as a heart block, that is initiated in the sinoatrial node.The initial action impulse in a heart is usually formed in the sinoatrial node (SA node) and carried through the atria, down the internodal atrial pathways to the atrioventricular node (AV) node. [2]
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]