7th December 2019


Where is the SA node located and what is its function?

The heart's natural pacemaker – the SA node – sends out regular electrical impulses from the top chamber (the atrium) causing it to contract and pump blood into the bottom chamber (the ventricle). The electrical impulse is then conducted to the ventricles through a form of 'junction box' called the AV node.

Likewise, where is the sinus node located in the heart?

The sinoatrial node (SA node), also known as sinus node, is a group of cells located in the wall of the right atrium of the heart.

What are the symptoms of sick sinus syndrome?

When they occur, sick sinus syndrome signs and symptoms might include:
  • Slower than normal pulse (bradycardia)
  • Fatigue.
  • Dizziness or lightheadedness.
  • Fainting or near fainting.
  • Shortness of breath.
  • Chest pains.
  • Confusion.
  • A sensation of rapid, fluttering heartbeats (palpitations)

Where is the SA node normally found?

The sinoatrial node is composed of a group of specialised cells positioned in the wall of the right atrium just lateral to the sinus venarum at the junction where the superior vena cava enters the right atrium. The SA node is located in the myocardium just internally to the epicardium.