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{{CMG}}
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{{SK}} Cannon A waves; Cannon A wave; Cannon a waves; Cannon a wave; Cannon atrial waves; Canon a waves
==Overview==
==Overview==
'''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>.
Cannon a 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, or when the [[right atrium]] contracts against a closed [[tricuspid valve]], the [[blood]] will be pushed against the [[AV valve]], and a very large retrograde [[pressure]] wave travels up the [[jugular 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>.


==Diagnosis==
==Diagnosis==
===Symptoms===
===Symptoms===
[[headache]], [[cough]], and [[jaw]] pain may be present
The following may be present:
*[[Cough]]
*[[Headache]]
*[[Jaw pain]]
 
===Physical Examination===
===Physical Examination===
====Neck====
====Neck====
This wave will cause [[pulse|pulsation]] in the neck and abdomen.
This wave will cause [[pulse|pulsation]] in the neck and abdomen.
{{#ev:youtube|gMBZMQwoi_I}}


==Causes==
==Causes==
[[Canon a waves]] may be present if there is delayed atrial contraction against a closed [[tricuspid valve]]:
*[[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>
 
*[[Complete heart block]]
*[[Junctional rhythms]]
*[[Junctional rhythms]]
*[[Pacemaker syndrome]]
*[[Pacemaker syndrome]]
*[[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>
*[[Ventricular tachycardia]]


==References==
==References==
{{reflist|2}}
{{reflist|2}}
{{Cardiovascular system symptoms and signs}}


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{{DEFAULTSORT:Cannon A Waves}}
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==References==
==References==
{{Reflist|2}}
{{Reflist|2}}
[[CME Category::Cardiology]]


[[Category:Cardiology]]
[[Category:Physical examination]]
[[Category:Physical examination]]
[[Category:Physical examination]]
[[Category:Signs and symptoms]]
[[Category:Cardiology]]
[[Category:Cardiology]]

Latest revision as of 06:15, 15 March 2016

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Cannon A waves; Cannon A wave; Cannon a waves; Cannon a wave; Cannon atrial waves; Canon a waves

Overview

Cannon a waves are waves seen occasionally in the jugular vein of humans with certain cardiac arrhythmias. When the atria and ventricles contract simultaneously, or when the right atrium contracts against a closed tricuspid valve, the blood will be pushed against the AV valve, and a very large retrograde pressure wave travels up the jugular vein[1][2].

Diagnosis

Symptoms

The following may be present:

Physical Examination

Neck

This wave will cause pulsation in the neck and abdomen.

{{#ev:youtube|gMBZMQwoi_I}}

Causes

References

  1. "cannon A waves - definition of cannon A waves in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia".
  2. "Pacemaker Syndrome: Overview - eMedicine Cardiology".
  3. Sam, Amir H. (2010). Rapid Medicine. Wiley-Blackwell. ISBN 1-4051-8323-3. Unknown parameter |coauthors= ignored (help)
  4. Sam, Amir H. (2010). Rapid Medicine. Wiley-Blackwell. ISBN 1-4051-8323-3. Unknown parameter |coauthors= ignored (help)


References

CME Category::Cardiology