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Sinus Node Rhythms and Arrhythmias: Difference between revisions
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Sinus Node Rhythms and Arrhythmias (view source)
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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 depolarize. Then the cells of the left atrium, the AV (atrioventricular)node, follow, 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 depolarize. Then the cells of the left atrium, the AV (atrioventricular)node, follow, and at last the ventricles are stimulated via the His bundle. | ||
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With this knowledge it is quite simple to recognize normal sinus rhythm on the ECG. | With this knowledge it is quite simple to recognize normal sinus rhythm on the ECG. | ||
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As you can see, knowledge of [[Rate|heart rate]] and [[P wave morphology]] are necessary to determine the rhythm. We have put Rhythm as step 1 as it is of great importance. Arrhythmias include the most life-threatening ECG abnormalities. In most settings, however, the rhythm will be sinus. | As you can see, knowledge of [[Rate|heart rate]] and [[P wave morphology]] are necessary to determine the rhythm. We have put Rhythm as step 1 as it is of great importance. Arrhythmias include the most life-threatening ECG abnormalities. In most settings, however, the rhythm will be sinus. | ||
If the rhythm is not sinus, the '''[[Arrhythmias| | If the rhythm is not sinus, the '''[[Arrhythmias|Arrhythmias algorithm]]''' should be followed. | ||
==Sinus arrhythmias== | ==Sinus arrhythmias== | ||
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*[[Sino-atrial_exit_block|Sino-atrial exit block]] | *[[Sino-atrial_exit_block|Sino-atrial exit block]] | ||
*[[Sick Sinus Syndrome]] | *[[Sick Sinus Syndrome]] | ||
*[[Sinus Arrhythmia]] | |||
Arrhythmias are discussed in the [[Arrhythmias]] chapter. | Arrhythmias are discussed in the [[Arrhythmias]] chapter. | ||