WordNet

the state of being joined together (同)conjunction, conjugation, colligation
an act of joining or adjoining things (同)adjunction
something that joins or connects (同)conjunction
the place where two or more things come together
recurring at regular intervals (同)regular recurrence
the basic rhythmic unit in a piece of music; "the piece has a fast rhythm"; "the conductor set the beat" (同)beat, musical rhythm
the arrangement of spoken words alternating stressed and unstressed elements; "the rhythm of Frosts poetry" (同)speech rhythm

PrepTutorEJDIC

〈U〉〈C〉連結すること(された状態),『結合』,連合,合体 / 〈C〉『結合点』,連結(接合,合流)点 / 〈C〉(鉄道の)『連絡駅』,接続駅
〈U〉『律動,リズム』;韻律 / 〈C〉(特定の)リズム

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/12/05 12:51:14」(JST)

wiki en

Junctional rhythm describes an abnormal heart rhythm resulting from impulses coming from a locus of tissue in the area of the atrioventricular node,^[1] the "junction" between atria and ventricles.

Under normal conditions, the heart's sinoatrial node determines the rate by which the organ beats - in other words, it is the heart's "pacemaker." The electrical activity of sinus rhythm originates in the sinoatrial node and depolarizes the atria. Current then passes from the atria through the bundle of His, from which it travels along Purkinje fibers to reach and depolarize the ventricles. This sinus rhythm is important because it ensures that the heart's atria reliably contract before the ventricles.

In junctional rhythm, however, the sinoatrial node does not control the heart's rhythm - this can happen in the case of a block in conduction somewhere along the pathway described above. When this happens, the heart's atrioventricular node takes over as the pacemaker.^[2]. In the case of a junctional rhythm, the atria will actually still contract before the ventricles; however, this does not happen by the normal pathway and instead is due to retrograde conduction (conduction comes from the ventricles or from the AV node into and through the atria).^[3].

Junctional rhythm can be diagnosed by looking at an ECG: it usually presents without a P wave or with an inverted P wave. Retrograde P waves refers to the depolarization from the AV node back towards the SA node. ^[4]

References

^ Merriam-Webster dictionary > Junctional rhythm Retrieved September 2010
^ eMedicine:"Junctional Rhythms" http://www.emedicine.com/MED/topic1212.htm
^ medical dictionary http://medical-dictionary.thefreedictionary.com/retrograde+conduction
^ Abnormalities in the ECG measurement http://library.med.utah.edu/kw/ecg/ecg_outline/Lesson4/index.html#PRinterval

UpToDate Contents

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1. 心電図チュートリアル：心房性および房室結節性（上室性）不整脈 ecg tutorial atrial and atrioventricular nodal supraventricular arrhythmias
2. 第3度（完全）房室ブロック third degree complete atrioventricular block
3. ジゴキシン中毒による不整脈 cardiac arrhythmias due to digoxin toxicity
4. 眼の待機手術に対する麻酔 anesthesia for elective eye surgery
5. 心臓自動能の増強 enhanced cardiac automaticity

English Journal

Single-catheter radiofrequency ablation of a permanent junctional reciprocating tachycardia in a premature neonate.

Femenía F, Sarquella-Brugada G, Brugada J.Source1 Arrhythmia Unit, Cardiology Department, Hospital Español de Mendoza, Godoy Cruz, Mendoza, Argentina.
Cardiology in the young.Cardiol Young.2012 Oct;22(5):606-9. Epub 2012 Mar 8.
A 34-week premature neonate presented with drug-refractory permanent junctional incessant tachycardia and haemodynamic compromise. The patient underwent successful radiofrequency catheter ablation using a single-catheter approach. The child remains in sinus rhythm, without pharmacological treatment,
PMID 22398140

Conventional and biventricular pacing in patients with first-degree atrioventricular block.

Barold SS, Herweg B.SourceFlorida Heart Rhythm Institute, Tampa, FL, USA.
Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology.Europace.2012 Oct;14(10):1414-9. Epub 2012 Apr 19.
Recent reports suggest that first-degree atrioventricular block is not benign. However, there is no evidence that shortening of the PR interval can improve outcome except for symptomatic patients with a very long PR interval ≥0.3 s. Because these patients require continual forced pacing, biventric
PMID 22516061

Japanese Journal

一時的心房ペーシングにより著明に循環動態を改善しえた急性下壁右室心筋梗塞の一例

平谷太吾,星智也,崔星河 [他]
茨城循環器研究会雑誌 19, 9-15, 2012
NAID 40019495368

A Case of Vasospastic Angina Who Had Significant Bradycardia Recorded Automatically in Implantable Loop Recorder with Delay from Symptom Onset

Ono Daisuke,Hirahara Taishi,Sugawara Yoshitaka,Suga Chikashi,Ako Jyunya,Momomura Shinichi
Journal of Arrhythmia 27(Supplement), PJ1_062, 2011
… ILR automatic record showed junctional rhythm and he was diagnosed as symptomatic sick sinus syndrome and recommended pacemaker implantation. … Before operation, ILR records were analyzed in detail, automatic record showed junctional rhythm and heart rate was 30/min, but symptom triggered record showed sinus rhythm and heart rate was 60/min. It showed that the bradycardia automatically recorded in ILR occured long after the symptom onset. …
NAID 130002130572

Related Pictures

★リンクテーブル★

リンク元	「房室接合部調律」
関連記事	「junction」「junctional」「rhythm」

「房室接合部調律」

　　[★]

英: atrioventricular junctional rhythm
同: 房室接合部性調律, 接合部調律 junctional rhythm
関: 房室接合部補充調律

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