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Sinoatrial node pacemaker cell electrical activity
- Molecular classification
- Ion channel (e.g., HCN/funny channel, voltage-gated calcium channels, potassium channels), Other (Na^+/K^+ exchanger, Na^+/Ca^2+ exchanger)
01
Overview
Pacemaker cell electrical activity refers to the cyclical generation of spontaneous action potentials in specialized cardiac cells (mainly in the sinoatrial node). These cells exhibit a slow, progressive depolarization (pacemaker potential) due to a coordinated activity of ion channels—primarily HCN (funny) channels, voltage-gated calcium channels, and potassium channels. This electrical rhythm sets the heart rate and ensures proper beating of the heart. Disruption in pacemaker cell electrical activity can lead to arrhythmias or the need for artificial pacemakers. Drugs targeting specific ion channels (e.g., ivabradine for the funny current) can modulate pacemaker activity as a therapeutic strategy.
- Other names
- pacemaker potentialpacemaker currentdiastolic depolarization
02
Mechanism of action
Blockade of HCN/funny current (reduces automaticity) Inhibition of Ca^2+ channels (slows heart rate) Modulation of potassium channel activity
03
Biological functions
Heart rhythm generation (automaticity)Cardiac excitationMaintenance of heart rate
04
Disease associations
Cardiovascular disease (bradycardia, arrhythmia, sick sinus syndrome)Other (complications with artificial pacemaker devices, heart block)
05
Safety considerations
Excessive suppression: bradycardia, heart blockPro-arrhythmic effectsNon-specificity (many ion channels involved in other tissues)
06
Interacting drugs
Ivabradine (blocks funny current I~f~)
3 more in the full profile.
07
Biomarkers
Resting heart rateECG intervals (PR interval, sinus rhythm stability)SAN/AV conduction abnormalities
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