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Bradycardia: Difference between revisions
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→Sinus Node Dysfunction
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==Sinus Node Dysfunction== | ==Sinus Node Dysfunction== | ||
===Sinus Bradycardia=== | |||
Sinus bradycardia is a slow sinus rhythm of <60 beats per minute. Sinus bradycardia can be physiological, as is athletes or during sleep. Commonly sinus bradycardia is caused by medication, ischemia or neuro-mediated bradycardia, such as in a vasovagal reaction. Furthermore metabolic diseases can cause bradycardia, e.g. hypothermia or hypothyroidism. | |||
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[[File:Sinusnode.jpg|right]] | [[File:Sinusnode.jpg|right]] | ||
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===Sinus Node Exit Block=== | ===Sinus Node Exit Block=== | ||
In the case of sinus node exit block, an impulse generated from the sinus node is blocked at one of the exit sides of the sinus node. However impulse formation is not affected, therefore the interval between subsequent beats should be similar to n=x times the P-P interval. On the surface electrocardiogram this is expressed as a pause. | In the case of sinus node exit block, an impulse generated from the sinus node is blocked at one of the exit sides of the sinus node. However impulse formation is not affected, therefore the interval between subsequent beats should be similar to n=x times the P-P interval. On the surface electrocardiogram this is expressed as a pause. | ||