Anti-arrhythmic drugs
Cardiac Conduction
System
,Cardiac Conduction System
The cardiac conduction system
consists of the following components:
1. Sinoatrial node:
• located in the right atrium near the
entrance of the superior vena cava
• natural pacemaker of the heart
• It initiates all heartbeat & determines
heart rate.
• Electrical impulses from SA node spread
throughout both atria and stimulate them
to contract.
,Cardiac Conduction System
2. The atrioventricular node, or
AV node,
• located on the other side of the right atrium,
near the AV valve.
• The AV node serves as electrical gateway
to the ventricles.
• It delays the passage of electrical impulses
to the ventricles.
• This delay is to ensure that the atria have
ejected all the blood into the ventricles
before the ventricles contract.
, Cardiac Conduction System
3. Bundles of His
• The AV node receives signals from the SA node and passes
them onto the atrioventricular bundle - AV bundle or bundle of
His
4.Right & left bundle branches:
• bundle is then divided into right and left bundle branches which
conduct the impulses toward the apex of the heart.
5. Purkinje fibers:
• The signals are then passed onto Purkinje fibers, turning upward
and spreading throughout the ventricular myocardium.
Cardiac Conduction
System
,Cardiac Conduction System
The cardiac conduction system
consists of the following components:
1. Sinoatrial node:
• located in the right atrium near the
entrance of the superior vena cava
• natural pacemaker of the heart
• It initiates all heartbeat & determines
heart rate.
• Electrical impulses from SA node spread
throughout both atria and stimulate them
to contract.
,Cardiac Conduction System
2. The atrioventricular node, or
AV node,
• located on the other side of the right atrium,
near the AV valve.
• The AV node serves as electrical gateway
to the ventricles.
• It delays the passage of electrical impulses
to the ventricles.
• This delay is to ensure that the atria have
ejected all the blood into the ventricles
before the ventricles contract.
, Cardiac Conduction System
3. Bundles of His
• The AV node receives signals from the SA node and passes
them onto the atrioventricular bundle - AV bundle or bundle of
His
4.Right & left bundle branches:
• bundle is then divided into right and left bundle branches which
conduct the impulses toward the apex of the heart.
5. Purkinje fibers:
• The signals are then passed onto Purkinje fibers, turning upward
and spreading throughout the ventricular myocardium.
