Junctional rhythm

Jump to navigation Jump to search

WikiDoc Resources for Junctional rhythm

Articles

Most recent articles on Junctional rhythm

Most cited articles on Junctional rhythm

Review articles on Junctional rhythm

Articles on Junctional rhythm in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Junctional rhythm

Images of Junctional rhythm

Photos of Junctional rhythm

Podcasts & MP3s on Junctional rhythm

Videos on Junctional rhythm

Evidence Based Medicine

Cochrane Collaboration on Junctional rhythm

Bandolier on Junctional rhythm

TRIP on Junctional rhythm

Clinical Trials

Ongoing Trials on Junctional rhythm at Clinical Trials.gov

Trial results on Junctional rhythm

Clinical Trials on Junctional rhythm at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Junctional rhythm

NICE Guidance on Junctional rhythm

NHS PRODIGY Guidance

FDA on Junctional rhythm

CDC on Junctional rhythm

Books

Books on Junctional rhythm

News

Junctional rhythm in the news

Be alerted to news on Junctional rhythm

News trends on Junctional rhythm

Commentary

Blogs on Junctional rhythm

Definitions

Definitions of Junctional rhythm

Patient Resources / Community

Patient resources on Junctional rhythm

Discussion groups on Junctional rhythm

Patient Handouts on Junctional rhythm

Directions to Hospitals Treating Junctional rhythm

Risk calculators and risk factors for Junctional rhythm

Healthcare Provider Resources

Symptoms of Junctional rhythm

Causes & Risk Factors for Junctional rhythm

Diagnostic studies for Junctional rhythm

Treatment of Junctional rhythm

Continuing Medical Education (CME)

CME Programs on Junctional rhythm

International

Junctional rhythm en Espanol

Junctional rhythm en Francais

Business

Junctional rhythm in the Marketplace

Patents on Junctional rhythm

Experimental / Informatics

List of terms related to Junctional rhythm

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

See also: Junctional bradycardia for slow junctional rhythms, and junctional tachycardia for fast jucntional rhythms

Overview

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

Classification

  • Junctional rhythm can be classified according to the rate of the heart rate as the following:[1][2][3]

Junctional Rhythm

  • The junctional rate is normal.

Junction escape rhythm:

  • The junctional rate is about 40-60 beats per minute.

Accelerated junctional rhythm:

  • The juncitonal rate can be accelerated (60-100 beats per minute).

Junctional Bradycardia

  • The junctional rate may be slow (40-60 beats per minute) in which case the rhythm is referred to as junctional bradycardia.

Junctional Tachycardia

Pathophysiology

Physiology

  • The sinoatrial node in the heart is the pacemaker that determine the rate of the heart beats. The electrical impulse starts from the sinoatrial node then travels through the atria. It continues through the bundle of his, Purkinje fibers, and the ventricles ending one heart beat.[4][5]
  • This sinus rhythm indicates the atria normally contracts before the ventricles.

Pathogenesis

  • In junctional rhythm, the heart beats rate are not controlled by the sinoatrial node. The new pacemaker in the junctional rhythm is the atrioventricular node.[6]
  • The atria contracts before the ventricles but from a different signal. The impulse contracting the atria comes from the ventricles not the normal impulse coming from the sinoatrial node.[7][8]

Causes

Junctional bradycardia

Junctional tachycardia

Epidemiology and Demographics

Prevalence

  • In the United States, the prevalence of junctional rhythm is 166 in 100,000 individuals with sinus node dysfunction.[10]

Age

  • The prevalence of junctional rhythm increases with age.

Gender

  • Men and women are affected equally by juntional rhythm.

Natural History, Complications and Prognosis

Natural History

Complications

  • Complications of junctional rhythm include the following:[11]
    • Syncope
    • Dizziness
    • Fatigue

Prognosis

  • Prognosis of junctional rhythm is good with the proper treatment.

History and Symptoms

History

  • Patients presenting with juncitonal rhythm disease should be asked properly for history of other cardiac conditions.
  • Other cardiac conditions can affect the presentation of the patients. These cardiac conditions include:
    • Heart failure
    • Sick sinus syndrome

Symptoms

  • Patients with juncitonal rhythm disease can be asymptomatic.
  • Symptoms of junctional rhythm can be non specific and includes the following:
    • Dizziness
    • Fatigue
    • Syncope
    • Palpitaions
  • Symptoms vary according to the underlying cause of junctional rhythm as the following:[12]
    • Heart failure:
      • Shortness of breath
      • Lower extremities edema
    • Valve dysfunction due to rheumatic fever:
      • Fever
      • Arthritis
      • Skin rash

Diagnosis

Electrocardiogram

  • The QRS complexes are narrow in so far as conduction down the His bundle is normal
  • The junctional rate may be slow (40-60 beats per minute) in which case the rhythm is referred to as junctional bradycardia
  • The junctional rate may be normal as shown in the tracing below
  • The junctional rate may be rapid in which case the rhythm is referred to as a junctional tachycardia
  • There is dissociation of the narrow complex QRS from an upright atrial p wave or the p wave is missing, or the p wave is retrograde (a retrograde p wave) due to retrograde conduction from the AV node back into the atrium.

EKG Examples


Shown below is an EKG depicting AV dissociation with variable timing of the p wave in relation to the QRS. A narrow complex junctional escape rhythm at 75 beats per minute is present.


Shown below is an EKG with a a regular rhythm at a rate of about 43/minute. There are no P waves to be seen and the QRS duration is about 80 ms. This is a nodal rhythm.

Copyleft images obtained courtesy of ECGpedia, http://en.ecgpedia.org.

Related Chapters

References

  1. Spodick DH (1992). "Normal sinus heart rate: sinus tachycardia and sinus bradycardia redefined". Am Heart J. 124 (4): 1119–21. doi:10.1016/0002-8703(92)91012-p. PMID 1529897.
  2. Thery C, Gosselin B, Lekieffre J, Warembourg H (1977). "Pathology of sinoatrial node. Correlations with electrocardiographic findings in 111 patients". Am Heart J. 93 (6): 735–40. doi:10.1016/s0002-8703(77)80070-7. PMID 871100.
  3. Dobrzynski H, Anderson RH, Atkinson A, Borbas Z, D'Souza A, Fraser JF; et al. (2013). "Structure, function and clinical relevance of the cardiac conduction system, including the atrioventricular ring and outflow tract tissues". Pharmacol Ther. 139 (2): 260–88. doi:10.1016/j.pharmthera.2013.04.010. PMID 23612425.
  4. Merriam-Webster dictionary > Junctional rhythm Retrieved September 2010
  5. Kim D, Shinohara T, Joung B, Maruyama M, Choi EK, On YK; et al. (2010). "Calcium dynamics and the mechanisms of atrioventricular junctional rhythm". J Am Coll Cardiol. 56 (10): 805–12. doi:10.1016/j.jacc.2010.03.070. PMC 3050609. PMID 20797495.
  6. eMedicine:"Junctional Rhythms" http://www.emedicine.com/MED/topic1212.htm
  7. medical dictionary http://medical-dictionary.thefreedictionary.com/retrograde+conduction
  8. Dobrzynski H, Anderson RH, Atkinson A, Borbas Z, D'Souza A, Fraser JF; et al. (2013). "Structure, function and clinical relevance of the cardiac conduction system, including the atrioventricular ring and outflow tract tissues". Pharmacol Ther. 139 (2): 260–88. doi:10.1016/j.pharmthera.2013.04.010. PMID 23612425.
  9. "Junctional Rhythm: Overview - eMedicine". Retrieved 2008-12-21.
  10. Romhilt DW, Doyle M, Sagar KB, Hastillo A, Wolfgang TC, Lower RR; et al. (1982). "Prevalence and significance of arrhythmias in long-term survivors of cardiac transplantation". Circulation. 66 (2 Pt 2): I219–22. PMID 6177443.
  11. Di Biase L, Gianni C, Bagliani G, Padeletti L (2017). "Arrhythmias Involving the Atrioventricular Junction". Card Electrophysiol Clin. 9 (3): 435–452. doi:10.1016/j.ccep.2017.05.004. PMID 28838549.
  12. Cools E, Missant C (2014). "Junctional ectopic tachycardia after congenital heart surgery". Acta Anaesthesiol Belg. 65 (1): 1–8. PMID 24988822.

fi:Junktionaalinen rytmi


Template:WikiDoc Sources