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What are the three internal pacemakers of the heart?

6 doctors weighed in
Dr. Ibrahim Moussa
Internal Medicine - Cardiology
3 doctors agree

In brief: Conduction system

The general rule with the heart is whomever is beating fastest takes over the pacing function.
The main pacemaker is the sa node sinoatrial which beats about 70 beats per minute, if the sa node fails the av node atrioventricular takes over which beats at 40-60, then lower down bundle of his, the left and right branches of this bundle, and the purkinje fibres, these beat around 30-40 bpm.

In brief: Conduction system

The general rule with the heart is whomever is beating fastest takes over the pacing function.
The main pacemaker is the sa node sinoatrial which beats about 70 beats per minute, if the sa node fails the av node atrioventricular takes over which beats at 40-60, then lower down bundle of his, the left and right branches of this bundle, and the purkinje fibres, these beat around 30-40 bpm.
Dr. Ibrahim Moussa
Dr. Ibrahim Moussa
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Dr. Charles Jost
Internal Medicine - Cardiology

In brief: See Below

The sinus node, the av node and the ventricle.

In brief: See Below

The sinus node, the av node and the ventricle.
Dr. Charles Jost
Dr. Charles Jost
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1 comment
Dr. Volkan Tuzcu
atria can be an internal pacemaker as well and show up as ectopic atrial rhythm
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Dr. Arnon Rubin
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