Transposition of the great vessels: Difference between revisions
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{{Infobox medical condition (new) | {{Short description|Congenital heart defect affecting the great arteries}} | ||
| name | {{Use dmy dates|date=March 2025}} | ||
| image | {{Infobox medical condition (new) | ||
| caption | | name = Transposition of the Great Vessels | ||
| synonyms = d-TGA, Congenital heart defect - transposition | |||
| pronounce | | image = D-tga-575px.jpg | ||
| field | | caption = Illustration of transposition of the great vessels | ||
| | | pronounce = | ||
| complications | | field = [[Pediatric cardiology]], [[Cardiothoracic surgery]] | ||
| onset | | symptoms = Cyanosis, rapid breathing, difficulty feeding, heart murmur | ||
| duration | | complications = Heart failure, pulmonary hypertension, arrhythmias | ||
| types | | onset = Congenital (present at birth) | ||
| duration = Lifelong condition (requires surgical correction) | |||
| causes | | types = [[Dextro-Transposition of the great arteries]] (d-TGA), [[Levo-Transposition of the great arteries]] (l-TGA) | ||
| risks | | causes = Genetic and environmental factors | ||
| diagnosis | | risks = Maternal diabetes, genetic syndromes, prenatal infections | ||
| differential | | diagnosis = [[Echocardiography]], [[Chest X-ray]], [[Electrocardiogram]], [[Cardiac catheterization]] | ||
| prevention | | differential = [[Tetralogy of Fallot]], [[Total anomalous pulmonary venous return]], [[Double outlet right ventricle]] | ||
| treatment | | prevention = Prenatal care, avoidance of teratogenic exposures | ||
| medication | | treatment = [[Arterial switch operation]], [[Atrial switch operation]], prostaglandin therapy | ||
| prognosis | | medication = [[Prostaglandins]], diuretics (supportive care) | ||
| frequency | | prognosis = Good with early surgical correction; lifelong follow-up required | ||
| deaths | | frequency = 1 in 3,000 to 5,000 live births | ||
| deaths = High mortality if untreated | |||
}} | }} | ||
'''Transposition of the | [[File:d-TGA.jpg|thumb|300px|Normal heart anatomy vs. d-TGA]] | ||
[[File:Transposition-of-great-vessels.jpg|thumb|200px|Chest X-ray showing the "egg-on-a-string" sign.]] | |||
'''Transposition of the Great Vessels''' ('''TGV''') is a group of [[congenital]] [[heart defects]] involving an abnormal arrangement of the [[great vessels]], including the aorta and pulmonary artery. It is a severe cyanotic congenital heart defect (CHD), meaning it causes a lack of oxygen in the body due to improper blood circulation.<ref name="warnes2006">{{cite journal |last1=Warnes |first1=Carole A. |title=Transposition of the Great Arteries |journal=Circulation |date=2006 |volume=114 |issue=24 |pages=2699–2709 |doi=10.1161/circulationaha.105.592352 |pmid=17159076 |doi-access=free }}</ref> | |||
The condition is primarily classified into dextro-Transposition of the Great Arteries (d-TGA) and levo-Transposition of the Great Arteries (l-TGA). It is one of the most common congenital heart defects requiring early surgical intervention. | |||
[[Transposition | == Types == | ||
[[File:Transposition great arteries Orphanet 1750-1172-3-27-2.JPEG|thumb|Subcostal [[echocardiography|echocardiographic]] view showing discordant ventriculoarterial connections.]] | |||
Transposition of the Great Vessels results in altered circulatory patterns, leading to cyanosis (bluish discoloration due to low oxygen levels). There are two major forms: | |||
===Dextro-Transposition of the | === Dextro-Transposition of the Great Arteries (d-TGA) === | ||
{{Main| | {{Main|Dextro-Transposition of the Great Arteries}} | ||
* Most common form of TGV | |||
* The aorta arises from the right ventricle, and the pulmonary artery arises from the left ventricle. | |||
* This creates two separate, non-mixing circulatory loops, preventing oxygen-rich blood from reaching the body. | |||
* Cyanosis appears shortly after birth due to a lack of oxygenated blood circulation. | |||
* Requires surgical intervention (arterial switch operation) within the first weeks of life. | |||
===Levo-Transposition of the | === Levo-Transposition of the Great Arteries (l-TGA) === | ||
{{Main|Levo-Transposition of the | {{Main|Levo-Transposition of the Great Arteries}} | ||
* Also called "congenitally corrected TGA" (ccTGA). | |||
* The ventricles and great arteries are transposed, but blood circulation remains normal because both atrioventricular and ventriculoarterial connections are reversed. | |||
* Often asymptomatic at birth, but may lead to heart failure, arrhythmias, or valve dysfunction later in life. | |||
== | == Symptoms and Signs == | ||
Symptoms depend on the type of transposition and any associated heart defects.<ref name="medlineplus">{{cite web |title=Transposition of the great arteries: MedlinePlus Medical Encyclopedia |url=https://medlineplus.gov/ency/article/001568.htm |website=medlineplus.gov |accessdate=28 May 2019 |language=en}}</ref> | |||
Common symptoms include: | |||
* Cyanosis (bluish skin color) | |||
* Rapid breathing (tachypnea) | |||
* Difficulty feeding | |||
* Heart murmur | |||
* Poor weight gain | |||
* Weak pulse or poor perfusion | |||
If untreated, complications such as heart failure and pulmonary hypertension can occur. | |||
== Risk Factors == | |||
Several factors increase the risk of transposition of the great vessels: | |||
* Maternal diabetes | |||
* Genetic syndromes (e.g., 22q11.2 deletion syndrome) | |||
* Prenatal infections (e.g., rubella) | |||
* Exposure to teratogens (e.g., alcohol, certain medications) | |||
* Family history of congenital heart defects | |||
== Diagnosis == | |||
Early diagnosis is essential, usually made before or shortly after birth using imaging and clinical tests. | |||
* Fetal echocardiography – Detects TGV in utero. | |||
* Postnatal echocardiography – Confirms the diagnosis and detects associated defects. | |||
* Chest X-ray – Classic “egg-on-a-string” appearance due to an enlarged heart and narrowed mediastinum. | |||
* Electrocardiogram (ECG) – Non-specific but may show right ventricular hypertrophy. | |||
* Cardiac catheterization – Occasionally needed for detailed structural analysis. | |||
== Treatment == | |||
Pre-Surgical Management | |||
1. Prostaglandin E1 (Alprostadil) – Keeps the ductus arteriosus open to allow blood mixing. | |||
2. Balloon Atrial Septostomy (Rashkind procedure) – Enlarges the foramen ovale to allow better oxygenation. | |||
Surgical Interventions | |||
#1. Arterial Switch Operation (ASO) | |||
* Preferred surgery for d-TGA. | |||
* Aorta and pulmonary artery are reconnected to the correct ventricles. | |||
* Performed within first two weeks of life. | |||
* Excellent long-term outcomes. | |||
#2. Atrial Switch Operations (Mustard or Senning Procedure) | |||
* Alternative for older patients who missed early intervention. | |||
* Creates an intra-atrial baffle to direct blood flow. | |||
* Higher risk of arrhythmias and right ventricular failure. | |||
#3. Double Switch Operation (for l-TGA) | |||
* Performed in levo-TGA cases with ventricular dysfunction. | |||
* Corrects both ventricular and arterial malposition. | |||
Post-Surgical Care | |||
* Regular cardiology follow-ups | |||
* Lifelong monitoring for arrhythmias, valve dysfunction, or heart failure | |||
* Exercise restrictions may be needed for some patients. | |||
== Prognosis == | |||
* Without surgery: High mortality within the first year of life. | |||
* With surgical correction: | |||
* 90% survival rate into adulthood. | |||
* Most children lead normal lives but require lifelong cardiac monitoring. | |||
* Risk of late complications (e.g., arrhythmias, heart failure) remains. | |||
== Prevention == | |||
While not always preventable, some measures can reduce risks: | |||
* Proper prenatal care | |||
* Diabetes management during pregnancy | |||
* Avoiding teratogens and infections during pregnancy | |||
* Genetic counseling for families with congenital heart disease history | |||
== See Also == | |||
* [[Dextro-Transposition of the great arteries]] | |||
* [[Levo-Transposition of the great arteries]] | |||
* [[Mustard procedure]] | |||
==See | |||
*[[ | |||
*[[ | |||
*[[Mustard procedure | |||
{{Congenital malformations and deformations of circulatory system}} | {{Congenital malformations and deformations of circulatory system}} | ||
{{Stub}} | |||
{{DEFAULTSORT:Transposition of the Great Vessels}} | |||
[[Category:Congenital heart defects]] | [[Category:Congenital heart defects]] | ||
[[Category:Neonatology]] | [[Category:Neonatology]] | ||
Latest revision as of 04:11, 20 March 2025
Congenital heart defect affecting the great arteries
| Transposition of the Great Vessels | |
|---|---|
| Synonyms | d-TGA, Congenital heart defect - transposition |
| Pronounce | |
| Field | Pediatric cardiology, Cardiothoracic surgery |
| Symptoms | Cyanosis, rapid breathing, difficulty feeding, heart murmur |
| Complications | Heart failure, pulmonary hypertension, arrhythmias |
| Onset | Congenital (present at birth) |
| Duration | Lifelong condition (requires surgical correction) |
| Types | Dextro-Transposition of the great arteries (d-TGA), Levo-Transposition of the great arteries (l-TGA) |
| Causes | Genetic and environmental factors |
| Risks | Maternal diabetes, genetic syndromes, prenatal infections |
| Diagnosis | Echocardiography, Chest X-ray, Electrocardiogram, Cardiac catheterization |
| Differential diagnosis | Tetralogy of Fallot, Total anomalous pulmonary venous return, Double outlet right ventricle |
| Prevention | Prenatal care, avoidance of teratogenic exposures |
| Treatment | Arterial switch operation, Atrial switch operation, prostaglandin therapy |
| Medication | Prostaglandins, diuretics (supportive care) |
| Prognosis | Good with early surgical correction; lifelong follow-up required |
| Frequency | 1 in 3,000 to 5,000 live births |
| Deaths | High mortality if untreated |


Transposition of the Great Vessels (TGV) is a group of congenital heart defects involving an abnormal arrangement of the great vessels, including the aorta and pulmonary artery. It is a severe cyanotic congenital heart defect (CHD), meaning it causes a lack of oxygen in the body due to improper blood circulation.<ref name="warnes2006">,
Transposition of the Great Arteries, Circulation, Vol. 114(Issue: 24), pp. 2699–2709, DOI: 10.1161/circulationaha.105.592352, PMID: 17159076,</ref>
The condition is primarily classified into dextro-Transposition of the Great Arteries (d-TGA) and levo-Transposition of the Great Arteries (l-TGA). It is one of the most common congenital heart defects requiring early surgical intervention.
Types[edit]
Transposition of the Great Vessels results in altered circulatory patterns, leading to cyanosis (bluish discoloration due to low oxygen levels). There are two major forms:
Dextro-Transposition of the Great Arteries (d-TGA)[edit]
- Most common form of TGV
- The aorta arises from the right ventricle, and the pulmonary artery arises from the left ventricle.
- This creates two separate, non-mixing circulatory loops, preventing oxygen-rich blood from reaching the body.
- Cyanosis appears shortly after birth due to a lack of oxygenated blood circulation.
- Requires surgical intervention (arterial switch operation) within the first weeks of life.
Levo-Transposition of the Great Arteries (l-TGA)[edit]
- Also called "congenitally corrected TGA" (ccTGA).
- The ventricles and great arteries are transposed, but blood circulation remains normal because both atrioventricular and ventriculoarterial connections are reversed.
- Often asymptomatic at birth, but may lead to heart failure, arrhythmias, or valve dysfunction later in life.
Symptoms and Signs[edit]
Symptoms depend on the type of transposition and any associated heart defects.<ref name="medlineplus">
Transposition of the great arteries: MedlinePlus Medical Encyclopedia(link). medlineplus.gov.
</ref>
Common symptoms include:
- Cyanosis (bluish skin color)
- Rapid breathing (tachypnea)
- Difficulty feeding
- Heart murmur
- Poor weight gain
- Weak pulse or poor perfusion
If untreated, complications such as heart failure and pulmonary hypertension can occur.
Risk Factors[edit]
Several factors increase the risk of transposition of the great vessels:
- Maternal diabetes
- Genetic syndromes (e.g., 22q11.2 deletion syndrome)
- Prenatal infections (e.g., rubella)
- Exposure to teratogens (e.g., alcohol, certain medications)
- Family history of congenital heart defects
Diagnosis[edit]
Early diagnosis is essential, usually made before or shortly after birth using imaging and clinical tests.
- Fetal echocardiography – Detects TGV in utero.
- Postnatal echocardiography – Confirms the diagnosis and detects associated defects.
- Chest X-ray – Classic “egg-on-a-string” appearance due to an enlarged heart and narrowed mediastinum.
- Electrocardiogram (ECG) – Non-specific but may show right ventricular hypertrophy.
- Cardiac catheterization – Occasionally needed for detailed structural analysis.
Treatment[edit]
Pre-Surgical Management 1. Prostaglandin E1 (Alprostadil) – Keeps the ductus arteriosus open to allow blood mixing. 2. Balloon Atrial Septostomy (Rashkind procedure) – Enlarges the foramen ovale to allow better oxygenation.
Surgical Interventions
- 1. Arterial Switch Operation (ASO)
- Preferred surgery for d-TGA.
- Aorta and pulmonary artery are reconnected to the correct ventricles.
- Performed within first two weeks of life.
- Excellent long-term outcomes.
- 2. Atrial Switch Operations (Mustard or Senning Procedure)
- Alternative for older patients who missed early intervention.
- Creates an intra-atrial baffle to direct blood flow.
- Higher risk of arrhythmias and right ventricular failure.
- 3. Double Switch Operation (for l-TGA)
- Performed in levo-TGA cases with ventricular dysfunction.
- Corrects both ventricular and arterial malposition.
Post-Surgical Care
- Regular cardiology follow-ups
- Lifelong monitoring for arrhythmias, valve dysfunction, or heart failure
- Exercise restrictions may be needed for some patients.
Prognosis[edit]
- Without surgery: High mortality within the first year of life.
- With surgical correction:
- 90% survival rate into adulthood.
- Most children lead normal lives but require lifelong cardiac monitoring.
- Risk of late complications (e.g., arrhythmias, heart failure) remains.
Prevention[edit]
While not always preventable, some measures can reduce risks:
- Proper prenatal care
- Diabetes management during pregnancy
- Avoiding teratogens and infections during pregnancy
- Genetic counseling for families with congenital heart disease history
See Also[edit]
- Dextro-Transposition of the great arteries
- Levo-Transposition of the great arteries
- Mustard procedure
| Congenital heart defects | ||||||
|---|---|---|---|---|---|---|
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