Second degree AV block historical perspective: Difference between revisions
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{{CMG}}; {{AE}} {{AEL}} | {{CMG}}; {{AE}} {{AEL}} | ||
==Overview== | ==Overview== | ||
Second-degree AV block was first described as a progressive delay between the [[atrial]] and [[ventricular]] contraction by Dr. Wenckebach in 1899. Dr. Mobitz then divided the second-degree AV block into two subtypes. In 1905, Dr. Hay figured out the pause following a wave was due to the failure of [[ventricular]] muscles to respond to a stimulus. | |||
==Historical perspective== | ==Historical perspective== | ||
*In 1899, Dr. Wenckebach described progressive delay between atrial and ventricular contraction and the eventual failure of a P wave to reach the ventricles. | *In 1899, Dr. Wenckebach described progressive delay between [[atrial]] and [[ventricular]] contraction and the eventual [[failure]] of a P wave to reach the [[ventricles]]. | ||
*Dr. Mobitz then divided the second degree AV block into two subtypes. | *Dr. Mobitz then divided the second-degree AV block into two subtypes. | ||
*In 1905, Dr. John Hay discovered the second degree of AV block.<ref name="pmid110971382">{{cite journal| author=Upshaw CB, Silverman ME| title=John Hay: discoverer of type II atrioventricular block. | journal=Clin Cardiol | year= 2000 | volume= 23 | issue= 11 | pages= 869-71 | pmid=11097138 | doi=10.1002/clc.4960231118 | pmc=6655013 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11097138 }}</ref> | *In 1905, Dr. John Hay discovered the second degree of AV block.<ref name="pmid110971382">{{cite journal| author=Upshaw CB, Silverman ME| title=John Hay: discoverer of type II atrioventricular block. | journal=Clin Cardiol | year= 2000 | volume= 23 | issue= 11 | pages= 869-71 | pmid=11097138 | doi=10.1002/clc.4960231118 | pmc=6655013 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11097138 }}</ref> | ||
* Dr. Hay was examining a patient who complains of slow pulse and dyspnea on exertion for more than 2 years. Dr. Hay noticed the heart rate dropping from 80 beats to 40 beats per minute. | * Dr. Hay was examining a [[patient]] who complains of [[slow]] [[pulse]] and [[dyspnea]] on exertion for more than 2 years. Dr. Hay noticed the [[heart rate]] dropping from 80 beats to 40 beats per minute. | ||
* Dr. Hay noted the a waves and the arterial pulse to remain stable in the beginning. However, recording pulsation | * Dr. Hay noted the a [[waves]] and the [[arterial pulse]] to remain stable in the beginning. However, recording pulsation several times resulted in "a" waves that were not followed by c wave. The a-c [[jugular wave]] interval was used as a measurement of [[AV conduction]]. | ||
* Dr. Hay figured out that the pause following a wave was due to failure of ventricular muscles to respond to a stimulus. | * Dr. Hay figured out that the pause following a wave was due to the failure of [[ventricular]] muscles to respond to a stimulus. | ||
==References== | ==References== |
Latest revision as of 12:28, 7 July 2021
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ahmed Elsaiey, MBBCH [2]
Overview
Second-degree AV block was first described as a progressive delay between the atrial and ventricular contraction by Dr. Wenckebach in 1899. Dr. Mobitz then divided the second-degree AV block into two subtypes. In 1905, Dr. Hay figured out the pause following a wave was due to the failure of ventricular muscles to respond to a stimulus.
Historical perspective
- In 1899, Dr. Wenckebach described progressive delay between atrial and ventricular contraction and the eventual failure of a P wave to reach the ventricles.
- Dr. Mobitz then divided the second-degree AV block into two subtypes.
- In 1905, Dr. John Hay discovered the second degree of AV block.[1]
- Dr. Hay was examining a patient who complains of slow pulse and dyspnea on exertion for more than 2 years. Dr. Hay noticed the heart rate dropping from 80 beats to 40 beats per minute.
- Dr. Hay noted the a waves and the arterial pulse to remain stable in the beginning. However, recording pulsation several times resulted in "a" waves that were not followed by c wave. The a-c jugular wave interval was used as a measurement of AV conduction.
- Dr. Hay figured out that the pause following a wave was due to the failure of ventricular muscles to respond to a stimulus.
References
- ↑ Upshaw CB, Silverman ME (2000). "John Hay: discoverer of type II atrioventricular block". Clin Cardiol. 23 (11): 869–71. doi:10.1002/clc.4960231118. PMC 6655013 Check
|pmc=
value (help). PMID 11097138.