Sinus Node Rhythms and Arrhythmias: Difference between revisions
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Pleas eread the [[Introduction|introduction to the 7+2 step plan]] first. | |||
The sinus node (SA) is located in the roof of the right atrium. It is the fastest physiological pacemaker. When the sinus node generates an electrical impulse, the surrounding cells of the right atrium depolarise, then the cells of the left atrium, the AV (atrioventricular) node follows and at last the ventricles are stimulated via the His bundle. | The sinus node (SA) is located in the roof of the right atrium. It is the fastest physiological pacemaker. When the sinus node generates an electrical impulse, the surrounding cells of the right atrium depolarise, then the cells of the left atrium, the AV (atrioventricular) node follows and at last the ventricles are stimulated via the His bundle. | ||
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These last two definitions will be discussed in the topic [[P wave morphology]]. | These last two definitions will be discussed in the topic [[P wave morphology]]. | ||
Heart rhythms which are not sinus rhythm are [[arrhythmias]]. | Heart rhythms which are not sinus rhythm are '''[[arrhythmias]]'''. | ||
==Sinus arrhythmias== | ==Sinus arrhythmias== | ||
Revision as of 00:48, 6 May 2009
| «Basics | Step 2: Heart Rate» |
| Author(s) | J.S.S.G. de Jong | |
| Moderator | I.A.C. van der Bilt | |
| Supervisor | ||
| some notes about authorship | ||
Pleas eread the introduction to the 7+2 step plan first.
The sinus node (SA) is located in the roof of the right atrium. It is the fastest physiological pacemaker. When the sinus node generates an electrical impulse, the surrounding cells of the right atrium depolarise, then the cells of the left atrium, the AV (atrioventricular) node follows and at last the ventricles are stimulated via the His bundle.
<flashow>http://nl.ecgpedia.org/images/0/09/Normal_SR.swf%7Calign=right%7Cheight=300px%7Cwidth=300px</flashow>
With this knowledge it is quite simple to recognise normal sinus rhythm on the ECG.
| Criteria for normal sinus rhythm (see also Basics): |
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These last two definitions will be discussed in the topic P wave morphology. Heart rhythms which are not sinus rhythm are arrhythmias.
Sinus arrhythmias
Some variants of sinusrhythm exist:
- Asystole
- Sinustachycardia (>100 beats per minute)
- Sinusbradycardia (<60 beats per minute)
- Sinus arrest or pause
- Sino-atrial exit block
- Sick Sinus Syndrome
Arrhythmias are discussed in the Arrhythmias chapter.
If the heart rate exceeds 100 bpm, the tachcyardia flow chart should be followed.
Examples
An example of normal sinus rhythm.
Another example of normal sinus rhythm.
