Electrical System
Fig 1 shows the electrical system of the heart, which includes:
Fig 1 shows the electrical system of the heart, which includes:
- Sinoatrial (S-A) node
This node is the cardiac pacemaker and is supplied by the right coronary artery in 65 % of people.
Fig 1 shows the electrical system of the heart, which includes:
- Sinoatrial (S-A) node
- Anterior, middle and posterior internodal tracts
Although these tracts exist, conduction through the atria is normally non-specific but synchronous.
Fig 1 shows the electrical system of the heart, which includes:
- Sinoatrial (S-A) node
- Anterior, middle and posterior internodal tracts
- Atrioventricular (A-V) node
The atrioventricular node slows the conduction of the AP to the ventricles and is responsible for the A-V conduction delay. Fibrous A-V rings electrically insulate the atria from the ventricles. The A-V node is the only electrical link.
Abnormal accessory pathways may be responsible for re-entrant tachycardias.
The A-V node is supplied by the right coronary artery in 80% of people.
Fig 1 shows the electrical system of the heart, which includes:
- Sinoatrial (S-A) node
- Anterior, middle and posterior internodal tracts
- Atrioventricular (A-V) node
- Atrioventricular bundle of His
This divides into left and right branches to conduct the AP to the ventricles.
