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Bradycardia: Difference between revisions
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=Introduction= | =Introduction= | ||
Bradycardias are defined as symptomatic heart rhythm disorders resulting in a inappropriately low heart rhythm during during physiologic conditions. Generally this results in a cut-off value of < | Bradycardias are defined as symptomatic heart rhythm disorders resulting in a inappropriately low heart rhythm during during physiologic conditions. Generally this results in a cut-off value of <60 beats per minute, however variation of normal heart rate may exist. For instance, during sleep and in athletes the heart rate can be as low as 40 beats per minute. | ||
Bradycardia can be caused by a variety of intrinsic and extrinsic causes. | Bradycardia can be caused by a variety of intrinsic and extrinsic causes. | ||
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=Sinus Node Dysfunction= | =Sinus Node Dysfunction= | ||
==Sinus Bradycardia== | ==Sinus Bradycardia== | ||
Sinus bradycardia is a slow hearth rhythm of <60 beats per minute. It can be | |||
==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 two subsequent beats should be similar to 2 times the P-P interval. | |||
==Sinus Arrest== | ==Sinus Arrest== | ||
If the sinus node has a problem with impulse formation it is defined as a sinus arrest. There can be the appearance of a irregular rhythm, however sinus P-waves are clearly present. | |||
==Sick Sinus Syndrome== | ==Sick Sinus Syndrome== | ||