Sinoatrial block

WikiDoc Resources for Sinoatrial block
Articles
Most recent articles on Sinoatrial block Most cited articles on Sinoatrial block Review articles on Sinoatrial block Articles on Sinoatrial block in N Eng J Med, Lancet, BMJ
Media
Powerpoint slides on Sinoatrial block Images of Sinoatrial block Photos of Sinoatrial block Podcasts & MP3s on Sinoatrial block Videos on Sinoatrial block
Evidence Based Medicine
Cochrane Collaboration on Sinoatrial block Bandolier on Sinoatrial block TRIP on Sinoatrial block
Clinical Trials
Ongoing Trials on Sinoatrial block at Clinical Trials.gov Trial results on Sinoatrial block Clinical Trials on Sinoatrial block at Google
Guidelines / Policies / Govt
US National Guidelines Clearinghouse on Sinoatrial block NICE Guidance on Sinoatrial block NHS PRODIGY Guidance FDA on Sinoatrial block CDC on Sinoatrial block
Books
Books on Sinoatrial block
News
Sinoatrial block in the news Be alerted to news on Sinoatrial block News trends on Sinoatrial block
Commentary
Blogs on Sinoatrial block
Definitions
Definitions of Sinoatrial block
Patient Resources / Community
Patient resources on Sinoatrial block Discussion groups on Sinoatrial block Patient Handouts on Sinoatrial block Directions to Hospitals Treating Sinoatrial block Risk calculators and risk factors for Sinoatrial block
Healthcare Provider Resources
Symptoms of Sinoatrial block Causes & Risk Factors for Sinoatrial block Diagnostic studies for Sinoatrial block Treatment of Sinoatrial block
Continuing Medical Education (CME)
CME Programs on Sinoatrial block
International
Sinoatrial block en Espanol Sinoatrial block en Francais
Business
Sinoatrial block in the Marketplace Patents on Sinoatrial block
Experimental / Informatics
List of terms related to Sinoatrial block

For patient information, click here

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mahmoud Sakr, M.D. [2]

Synonyms and keywords:

Overview

The sinoatrial (SA) node represents the original pacemaker of the heart. It's formed of cells, sometimes called P cells, in a compact region at the junction of the high right atrium and the superior vena cava. The surrounding cells or Perinodal cells, sometimes called (T) cells, transmit the electrical impulse from the SA node to the right atrium. Each of these cell types has distinct expression profiles of ion channels and gap junctions. SA nodal dysfunction typically results from either abnormalities in signal generation by the P cells or abnormalities in conduction across the T cells. Sinoatrial nodal dysfunction includes pauses, arrest, exit block and ultimately sick sinus syndrome. Here we will discuss sinoatrial block.

Differentiating Sinoatrial block from other Diseases

Types of SA nodal dysfunction include:

• • SA nodal exit block; SA nodal exit block occurs as a result of interference with the delivery of impulses from the SA node to its neighboring atrial tissue.
• Sinus pause or arrest; this abnormality is an alteration in discharge by the SA pacemaker; as a result, the duration of the pause is variable and presents as a pause with no P waves on EKG.
• Sinus arrhythmia; small changes in the sinus cycle length. The formal definition of sinus arrhythmia is a variation in the P-P interval by 0.12 sec (120 msec) or more in the presence of normal P waves and the usual PR interval. This type is common in the young, usually related to variation with respirations and is not considered abnormal.
• Wandering atrial pacemaker; which represents three or more ectopic foci within the atrial myocardium that serve as the dominant pacemaker.
• Sick sinus syndrome

References

Template:WikiDoc Sources