Single Ventricle

What is the heart defect called Single Ventricle ?

While the normal heart has two ventricles, in some birth defects, one of these ventricles may be absent or poorly developed. This condition is called Single Ventricle or Univentricular heart.

The ventricular structure may resemble the normal left ventricle or the normal right ventricle. Sometimes, it resembles neither, and this is called Indeterminate ventricle morphology.

In a single ventricle heart, there are two normal atria – right and left. These open into the ventricle through an atrio-ventricular (AV) valve. There might be
two AV valves, both opening into the ventricle – a condition called Double Inlet Ventricle – or one AV valve only, with the other one being absent (Atresia)

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Transposition of Great Arteries – TGA

I hope you still remember about the great arteries of the body, and the chambers of the heart from which they arise. In this article, we will discuss the condition called Transposition of the Great Arteries (TGA) in which these great vessels are inter-changed in position.

Here’s what you’ll learn about:

  • What is Transposition of the Great Arteries (TGA) ?
  • What happens in TGA ?
  • What if TGA is left untreated ?
  • When should TGA be treated ?
  • What are the treatment options ?
  • Initial stabilization
  • Palliative treatment
  • Definitive treatment
  • Arterial Switch Operation (ASO)
  • Atrial Switch Procedures
  • Some Special Circumstances

What is Transposition of the Great Arteries?

The two “great” arteries of the body are the aorta and the pulmonary artery. The aorta comes out of the left ventricle, and carries pure blood to the rest of the body. The pulmonary artery arises from the right ventricle and carries impure blood from the veins into the lungs for oxygenation.

Transposition of the Great Arteries – TGA, for short – as the name implies, means the two arteries are “transposed”. That is, the aorta arises from the right ventricle, and the pulmonary artery from the left ventricle.

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