Persistent Truncus Arteriosus (Types I, II, III, and IV)

Question 1

In PTA, the Ao and Pa are ____.

Answer 1

combined

Question 2

Type I PTA:

Answer 2

the Pa trunk arises from the main trunk

Question 3

Type II PTA:

Answer 3

RPA and LPA arise from the main trunk.

Branches are on posterior side of main trunk.

Question 4

Type III PTA:

Answer 4

RPA and LPA arise off main trunk towards the arch.

Branches are on lateral sides of main trunk.

Question 5

Type IV PTA:

Answer 5

RPA and LPA branches off arch of main trunk.

Question 6

Cause of PTA:

Answer 6

1. No truncal septation
2. Malformation of Conal Swellings
3. Failure of spiral septation to occur

Question 7

Associated lesion:

Answer 7

VSD

Question 8

There is a ___ and ____ overload to the lungs.

Answer 8

volume, pressure

Question 9

PTA is a ____ _____

Answer 9

cyanotic lesion

Question 10

Surgical correction:

Answer 10

1. Create a Pa by using the truncus or graft
2. Valve repair / Patient may end up with 2 valve replacements.
3. Close VSD

Question 11

Additional characteristics for PTA

Answer 11

1. Unusual coronaries
2. Large VSD
3. Tricuspid Regurge
4. LA and RA dilated
5. Large truncal valve
6. Secundum ASD
7. Atretic Pa (if arises from truncus)