Cannon a waves: Difference between revisions
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==Overview== | ==Overview== | ||
[[Canon a waves]] may be present if there is delayed atrial contraction against a closed [[tricuspid valve]] | '''Cannon A waves''', or cannon [[atrial]] [[waves]], are waves seen occasionally in the [[jugular vein]] of humans with certain [[cardiac arrhythmias]]. When the [[Atrium (heart)|atria]] and [[Ventricle (heart)|ventricles]] [[contract]] simultaneously, the [[blood]] will be pushed against the [[AV valve]], and a very large [[pressure]] wave runs up the [[vein]]<ref name="urlcannon A waves - definition of cannon A waves in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia.">{{cite web |url=http://medical-dictionary.thefreedictionary.com/cannon+A+waves |title=cannon A waves - definition of cannon A waves in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia. |work= |accessdate=}}</ref><ref name="urlPacemaker Syndrome: Overview - eMedicine Cardiology">{{cite web |url=http://emedicine.medscape.com/article/159706-overview |title=Pacemaker Syndrome: Overview - eMedicine Cardiology |work= |accessdate=}}</ref>. It is associated with heart block, in particular third-degree (complete) heart block. <ref>{{cite book |last= Sam |first= Amir H. |coauthors= James T.H. Teo |title= [[Rapid Medicine]] |publisher= [[Wiley-Blackwell]] |year= 2010 |isbn= 1-4051-8323-3}}</ref> It is also seen in pulmonary hypertension. <ref>{{cite book |last= Sam |first= Amir H. |coauthors= James T.H. Teo |title= [[Rapid Medicine]] |publisher= [[Wiley-Blackwell]] |year= 2010 |isbn= 1-4051-8323-3}}</ref> | ||
This wave will cause [[pulse|pulsation]] in the neck and abdomen, [[headache]], [[cough]], and [[jaw]] pain<ref name="urlPacemaker Syndrome: Overview - eMedicine Cardiology"/>. | |||
==Cuases== | |||
[[Canon a waves]] may be present if there is delayed atrial contraction against a closed [[tricuspid valve]]: | |||
*[[Junctional rhythms]] | |||
==References== | |||
{{reflist}} | |||
{{Cardiovascular system symptoms and signs}} | |||
{{DEFAULTSORT:Cannon A Waves}} | |||
[[Category:Medical signs]] | |||
==References== | ==References== | ||
Revision as of 02:20, 4 September 2012
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Cannon A waves, or cannon atrial waves, are waves seen occasionally in the jugular vein of humans with certain cardiac arrhythmias. When the atria and ventricles contract simultaneously, the blood will be pushed against the AV valve, and a very large pressure wave runs up the vein[1][2]. It is associated with heart block, in particular third-degree (complete) heart block. [3] It is also seen in pulmonary hypertension. [4]
This wave will cause pulsation in the neck and abdomen, headache, cough, and jaw pain[2].
Cuases
Canon a waves may be present if there is delayed atrial contraction against a closed tricuspid valve:
References
- ↑ "cannon A waves - definition of cannon A waves in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia".
- ↑ 2.0 2.1 "Pacemaker Syndrome: Overview - eMedicine Cardiology".
- ↑ Sam, Amir H. (2010). Rapid Medicine. Wiley-Blackwell. ISBN 1-4051-8323-3. Unknown parameter
|coauthors=ignored (help) - ↑ Sam, Amir H. (2010). Rapid Medicine. Wiley-Blackwell. ISBN 1-4051-8323-3. Unknown parameter
|coauthors=ignored (help)