VASCULAR RING & SLING

1. VASCULAR RING AND SLING
Presenter- Dr.Jyotindra Singh
NIMS,HYDERABAD

2. INTRODUCTION
Aortic arch anomalies producing tracheo esophageal
constriction account for 1 to 2% of all congenital heart disease.
Vascular ring is a congenital anomaly in which the aortic arch
and its branches completely or incompletely encircle and
compress the trachea or esophagus, or both.
Vascular sling is a congenital anomaly in which the left
pulmonary artery arises from the right pulmonary artery
extrapericardially (anomalous left pulmonary artery), courses
to the left behind the tracheal bifurcation and in front of the
esophagus to reach the left lung hilum, and forms a sling
around the trachea.

4. HISTORICAL ASPECTS
The condition of double aortic arch was apparently first described by
Hommel in 1737 (cited by Turner) and a century later by Von Siebold.
The complex development and regression of the aortic arches during fetal
development was elucidated by Congdon in 1922,
Wolman is credited with describing the syndrome of tracheal and
esophageal compression produced by a double arch in 1939.
Stimulus for modern interest in these anomalies was prompted by the first
surgical correction of a double aortic arch by Gross
in 1945.
The basis for radiologic diagnosis was initially described by Neuhauser.

5. HISTORICAL ASPECT
1948, Edwards introduced the hypothetical double aortic arch
scheme to conceptualize the numerous anomalies of the arch
complex.
This was further elaborated by Kirklin and Clagett in 1950 and
by Stewart, Kincaid, and Edwards in 1964.
In 1951, Barry provided a clear anatomic summary and review
of Congdon's basic work.
In 1999, Momma and colleagues followed by McElhinney and
colleagues identified chromosome 22ql l deletions associated
with isolated anomalies of laterality or branching of the aortic
arch

7. EMBRYOLOGY
By 5 weeks of fetal development, the
primordial heart tubes have fused and
six aortic (branchial) arches have
formed between the ventral roots and
dorsal aortae
During normal
development, persistence of the left
fourth aortic arch forms the arch of
the aorta and proximal left
subclavian artery.
The right fourth aortic arch forms the
innominate and right subclavian
arteries.
Involution of the distal right aorta
results in an unpaired single aortic
arch.
Aortic
--sac

8. Fourth Pair
RIGHT:
Becomes the
proximal part
of the right
subclavian
artery
LEFT: Forms
part of the arch
of aorta

9. Arch of Aorta
Derived as:
Proximal segment
from aortic sac
Middle segment from
the left 4th aortic arch
Distal segment from
the left dorsal aorta

10. Subclavian Artery
The right subclavian
artery formed from
the:
 Right 4th aortic
arch
 Right dorsal aorta
&
 Right 7th
intersegmental
artery
The left subclavian
artery formed from
the left 7th
intersegmental artery

11. Sixth Pair
RIGHT:
• Proximal part: persists as
the proximal part of the
right pulmonary artery
• Distal part: degenerates
LEFT:
• Proximal part: persists as
the proximal part of the left
pulmonary artery
• Distal part: forms ductus
arteriosus, a shunt
between pulmonary artery

12. Group I-Complete vascular ring
Double aortic arch
Right aortic arch with retroesophageal component
Mirror-image branching with retroesophageal ligamentum arteriosum
Retroesophageal left subclavian artery with ligamentum arteriosum
Retroesophageal left innominate artery
Right aortic arch with retroesophageal left subclavian artery
Left aortic arch and right descending aorta with right ligamentum
arteriosum or patent ductus arteriosus
Cervical aortic arch complex

13. Group II -Incomplete vascular ring
Left aortic arch and retroesophageal right subclavian
artery
Tracheal compression by innominate or left common
carotid artery
Ductus arteriosus sling
Malrotation of heart with patent ductus arteriosus
GROUP III- Pulmonary artery Sling

15. DOUBLE AORTIC ARCH
HOW IT IS FORMED ?
WHAT IS DOUBLE AORTIC
ARCH?
HOW IS VASCULAR RING
FORMED?
ORIGIN OF VESSELS?
RIGHT DOMINANT,LEFT
DOMINANT,BALANCED?

17. Double aortic arch
A double aortic arch is the most common complete vascular ring that causes
tracheoesophageal compression.
Patients typically present in the first months of life with symptoms of stridor,
respiratory distress, and a cough that sounds like a seal's bark. A simple cold may
precipitate severe respiratory difficulty.
In patients with double aortic arch, the ascending aorta arises normally, but as it
leaves the pericardium it divides into two branches, a left and a right aortic arch that
join posteriorly to form the descending aorta.
The left arch passes anteriorly and to the left of the trachea in the usual position and
is joined by the ductus arteriosus (or more often a ligamentum arteriosum), where it
becomes the descending aorta.
The right aortic arch passes to the right and then posterior to the esophagus to join
the left-sided descending aorta, thus completing the vascular ring .

18. DOUBLE AORTIC ARCH
Two-thirds of these infants, the right-sided (posterior) arch is dominant, and
in one-third, the left-sided (anterior) arch is dominant. Rarely, the arches are
of equal size (balanced arches).
The right arch gives origin to two vessels, the right common carotid and right
subclavian arteries,
The left arch gives origin to the left common carotid and left subclavian
arteries, in that order.
“Four artery sign.” - When the two dorsal subclavian arteries arise directly
from the aorta and not from a brachiocephalic artery.
2 dorsal subclavian arteries and 2 ventral carotid arteries spaced evenly
around the trachea.

19. Double Aortic Arch
Both arches patent
Symmetrical origin
Atretic L arch distal to
the origin of L SCA
Atretic segment
between L CCA
and L SCA

20. VARIANTS
The right aortic arch is often (50%) larger (right dominant) than the left arch, which usually
becomes narrow or atretic in its distal part beyond the origin of the left subclavian artery .
This portion may remain patent or be represented by a fibrous chord that joins the
descending aorta, often at the site of a diverticulum.
Less commonly (25%) the left aortic arch is larger (left dominant) than the right
arch, which, although smaller in its distal part after the origin of the right subclavian
artery, is rarely atretic .
Size of the right and left aortic arches is about equal (balanced) in about 25% of cases.
Associated cardiovascular anomalies are not common, but include tetralogy of Fallot and
transposition of the great arteries.

21. 5. Double Aortic Arch
Clinical features
–
vascular ring – symtoms depend on tightness of ring
When both arches widely patent  tight ring  stridor in 1st wk
Atretic L arch  loose ring  present at 3-6/12 week or later
Rarely double AA present in adulthood - swallowing/resp. syms
21

23. DOUBLE AORTIC ARCH
CHILD WITH RECURRENT PNEUMONIA

24. Double Aortic Arch. Frontal chest shows impression on right-side of barium-filled esophagus from higher
right-sided arch and below it an impression on the left-side of the esophagus from left-sided arch.
Lateral film shows anterior displacement of both trachea and esophagus.

28. SURGICAL APPROACH & PRINCIPLE
Surgical approach is determined by which arch is dominant.
When the right arch is dominant (75%)- left thoracotomy.
When the left arch is dominant (18%)- right thoracotomy.
When the arches are balanced (7%), - left thoracotomy is preferred.
If the patient has a significant intracardiac lesion-median sternotomy.
MRI / CT scan shows Right posterior arch is smaller- Right thoracotomy

34. SURGICAL STEPS
What surgical approach taken?
Muscle-sparing technique,-elevating the serratus anterior and the latissimus
dorsi
Fourth intercostal space.
How is lung retracted?
Before opening pleura ,what structures to identify?
Relation of vagus nerve?
How is pleura opened?

35. Surgical steps
Ligamentum arteriosum identified?
Isolation of posterior arch
Which arch to preserve?
Site of division?--
Caution before clamp/vascular division?
Is mediatinal pleura sutured?

36. Post operative care
High humidity to loosen secretions;
oxygen therapy when needed, as
monitored by pulse oximetry;
chest physiotherapy;
and nasopharyngeal suctioning.
to achieve early extubation.
Nebulization.

38. Right Arch of Aorta
Occurs when the entire right aortic arch persists
&the segment of left dorsal aorta distal to the 7th
intersegmental artery involutes
TYPES:
 Without retropharyngeal component:
The DA passes from right pulmonary artery
to right arch of aorta. No effect on the
trachea & esophagus
 With retropharyngeal
component: The right arch lies
posterior to esophagus.
The attachment of DA to distal
part of the arch of aorta forms a
ring around the trachea &
esophagus and may lead to their
compression

39. Type I –RAA without retroesophageal component
• Mirror image of normal
• Interruption of embryonic left arch distal to ductus arteriosus.
Almost always ass. with congenital intracardiac disease
– Conotruncal anomalies – TOF, TA, TGA, DORV, LTGA, PA with RV aorta
– Other lesions – VSD, PA with IVS
Ductus is commonly L sided - attached to L innom. A. – no vascular ring
Echo/Angio -Distinctive branching pattern
CxR/ Ba oesophagography -R indentation of trachea/oesophagus
• Treatment
RAA only - No Rx needed
39

40. Type II vascular rings (right aortic arch with
retroesophageal ligamentum arteriosum)
account for 45% of complete vascular rings.
The majority of these defects have left
descending aortas.
A remnant or stump of the left fourth arch
(Kommerell's diverticulum) may persist.
The left subclavian artery arises aberrantly
behind the esophagus from the right-sided arch
or from Kommerell's diverticulum.
Near this point the left-sided ligamentum
emanates and joins the left pulmonary artery to
create a complete ring about the trachea and
esophagus.
40

41. Mirror-image branching and
retroesophageal ligamentum arteriosum.
Interruption of the left arch is proximal
(upstream) to the ductus arteriosus
The left-sided ligamentum arteriosum
extends from a diverticulum
(Kommerell) on the upper descending
thoracic aorta, behind the esophagus,
forward to the left pulmonary artery.
The vascular ring is formed by the
ascending portion of the right arch and
innominate artery anteriorly, by the
aortic diverticulum posteriorly, and by
the ligamentum arteriosum laterally.
This anomaly is rare.

42. KOMMERELL’s Diverticulum
identification of a Kommerell's
diverticulum as part of the pathology.
Remnant of the left fourth aortic arch
that did not undergo complete
involution.
The diverticulum may independently
compress the esophagus or trachea.
Complications of ruptured aneurysm
and aortic dissection.
This aneurysmal dilatation should be
resected if present and usually
necessitates transfer of the left
subclavian artery to the left carotid
artery

44. .
.
.

45. Representative 3D CTA showing Kommerell’s
diverticulum and aberrant left subclavian
artery
Sagittal view showing
compression of the trachea
by the arch and aberrant
subclavian artery

46. TYPE III

47. Type III-Retroesophageal left subclavian artery and ligamentum
(ductus) arteriosum.
Most common type of vascular ring
associated with right arch.
Interruption of the left arch occurs
between the left subclavian and left
common carotid arteries .
The first branch of the right arch
becomes the left common carotid
artery, and the descending aorta gives
origin to the left subclavian artery as
the fourth branch.
It is usually loose, so compression of
either the esophagus or trachea is
uncommon.
Associated cardiac anomalies are
rare.

49. Type IV-Retroesophageal left innominate artery
Here interruption occurs
between the left common
carotid and the right arch
A vascular ring is present, but
the anomaly is rare.

51. Surgical approach
The surgical approach is through a left
thoracotomy.
After careful dissection and identification
of the configuration of the aortic arch, the
ligamentum arteriosum is identified as
compressing the esophagus.
The ring is released by dividing the
ligamentum between vascular clamps
and oversewing the stumps with Prolene
suture.
Any adhesive bands around the
esophagus are lysed.

53. SURGICAL REPORT
11 children required additional surgery because their vascular ring
(ligamentum) was divided without addressing the associated Kommerell's
diverticulum.
All were symptomatic, with recurrent respiratory symptoms or recurrent
dysphagia.
All patients responded to reoperation with resection of the diverticulum and
transfer of the left subclavian artery to the left carotid artery with resolution of
airway symptoms
The primary strategy for patients with a right aortic arch, left ligamentum,
and Kommerell's diverticulum –
division of the ligamentum,
resection of Kommerell's diverticulum,
left subclavian artery transfer

54. CIRCUMFLEX AORTA
RAA + LEFT LIGAMENTUM
ARTERIOSUM + LEFT
DESCENDING THORACIC AORTA
UNCROSSING OPERATION
Median sternotomy+ CPB+ HCA
Aortic arch mobilized + divided
infront of tracheobronchial tree+
reanastomosed end to side to the
lateral aspect of ascending aorta.

55. LEFT AORTIC ARCH
Vascular rings are likely in the
uncommon combination of aortic arch
and right descending aorta.
The left arch crosses behind the
esophagus.
In combination with right patent
ductus arteriosus or ligamentum
arteriosum, a vascuLAR RING IS
FORMED.

56. CERVICAL AORTIC ARCH
Cervical aortic arch is a developmental entity
consisting of persistence of the right or left
third branchial arch and regression of the
fourth branchial arch.
The aorta is usually redundant and crosses to
the opposite side posterior to the esophagus.
A vascular ring is formed when there is an
aberrant subclavian artery on the side of the
aortic arch and a ligamentum arteriosum.
Abnormalities of brachiocephalic arterial
branching and arch laterality are common in
patients with cervical aortic arch.
Vascular ring is frequently present, usually
formed by the right aortic arch and aberrant
left subclavian artery, but occasionally by
double aortic arch.

57. 2.1 L AA with retroesophageal R SCA
Most common arch anomaly – 0.5% population
Higher incidence in Downs with CHD – 38%
Mostly asymptomatic
Ba oesophagograph -Small filling defect slanting up and R
57

59. Innominate artery compression Syndrome
Anterior compression of the trachea by the innominate artery.
There is a “normal” left aortic arch- innominate artery originate more posteriorly
and leftward on the aortic arch than usual.
The artery then courses to the right, upward, and posterior to reach the thoracic
outlet, it compresses the trachea anteriorly.
Infants present with stridor, respiratory distress, cyanosis, and apnea with feeding.
The infant may hold its head hyperextended to splint the trachea and improve
breathing.
Rigid bronchoscopy -demonstrate a pulsatile anterior compression of the trachea
Anterior compression of the tracheal wall by the bronchoscope may compress the
innominate artery and temporarily obliterate the right radial pulse.
The diagnosis can be confirmed by CT scan, which will demonstrate flattening and
obliteration of the tracheal lumen by the contrast-filled innominate

62. PULMONARY ARTERY SLING
A pulmonary artery sling is a rare vascular
anomaly in which the left pulmonary artery
originates from the right pulmonary artery
and encircles the right mainstem bronchus
and distal trachea before coursing anterior
to the esophagus and descending aorta to
enter the hilum of the left lung
First reported by Glaevecke and Doehle.
Cosentino and associates- “ring-sling”
complex.
Nearly all infants present within the first
months of life with respiratory distress,
particularly if there are associated complete
tracheal rings.
complete tracheal rings were found in 58%
of patients with pulmonary artery sling.

63. A chest radiograph may show
unilateral hyperaeration of the right
lung field.
A barium esophagogram shows
anterior compression of the
esophagus on the lateral views.
Both CT and MRI will show the left
pulmonary artery originating from the
right pulmonary artery, encircling the
trachea, and coursing to the hilum of
the left lung .
Echocardiography is- diagnostic
procedure of choice for pulmonary
artery sling for the patient with an
unstable airway.
Bronchoscopy should be performed
in all these infants to check for
associated complete tracheal rings.

64. SURGICAL APPROACH
Surgical intervention should be
undertaken as soon as the diagnosis is
made because of the usual tenuous
respiratory status.
The first successful operation -by Potts
and coworkers69 at Children's Memorial
Hospital through a right thoracotomy.
Present approach with median
sternotomy and the use of
extracorporeal circulation.
This allows accurate division of the left
pulmonary artery with implantation into
the main pulmonary artery anterior to
the trachea
Over 50% will have associated complete
tracheal rings (the ring-sling
complex), the median sternotomy
approach allows simultaneous

65. VATS
Video-assisted thoracoscopic surgery (VATS)
has been successfully applied to some
patients with complete vascular rings.
The most suitable patients are those with a
right aortic arch with aberrant left
subclavian artery and left
ligamentum arteriosum (type IB) and
the occasional patient with a double aortic
arch with an atretic left arch.
In these patients a nonvascular segment of
the ring can be approached endoscopically
and safely divided.
MRI can accurately detect segmental patency
or atresia and thereby identify those vascular
ring patients suitable for the VATS approach.

66. THANK
YOU