RT Book, Section
A1 Doherty, Gerard M.
SR Print(0)
ID 58103886
T1 Truncus Arteriosus
T2 Quick Answers Surgery
YR 2010
FD 2010
PB The McGraw-Hill Companies
PP New York, NY
SN 
LK accesssurgery.mhmedical.com/content.aspx?aid=58103886
RD 2024/04/23
AB •  A  congenital  heart  lesion  that  increases  pulmonary  arterial  blood  flow•  Results  in  left-to-right  shunt,  results  in  lung  infection,  pulmonary  vascular  congestion,  pulmonary  artery  (PA)  hypertension,  right  heart  failure,  pulmonary  vasoconstriction,  pulmonary  vascular  obstructive  disease•  Eisenmenger  syndrome:  Increased  pulmonary  hypertension  such  that  left-to-right  shunt  ceases  and  shunt  becomes  right-to-left,  requiring  heart-lung  transplant•  Inhaled  nitric  oxide,  oxygen,  or  IV  tolazoline  reverses  PA  vasoconstriction•  PA  band  is  palliative  and  can  reduce  PA  flow  to  alleviate  RV  failure  and  progression  of  pulmonary  hypertension•  Single  large  truncal  vessel  overrides  ventricular  septum  and  distributes  all  blood  ejected  from  heart•  Truncal  root  bifurcates  into  pulmonary  trunk  and  aorta•  Ventricular  septal  defect  (VSD)  present  usually  direct  beneath  truncal  valve•  Atrial  septal  defect  (ASD)  (>  40%),  interrupted  aortic  arch  (10%),  abnormal  origins  of  coronary  artery•  In  most  cases,  pulmonary  flow  is  increased