In this episode, CardioNerds (Amit Goyal), ACHD series co-chair, Dr. Josh Saef (ACHD fellow at University of Pennsylvania) and episode lead fellow, Dr. Brynn Connor (Pediatric Cardiology fellow at Lucile Packard Children's Hospital at Stanford) are joined by Dr. Maan Jokhadar (Advanced heart failure and adult congenital heart disease specialist at Emory University) to discuss transposition of the great arteries. Audio editing by CardioNerds Academy Intern, Dr. Maryam Barkhordarian.
For a brief review of the basic anatomy and physiology of D-TGA, check-out this great video by Dr. Maan Jokhadar!
The CardioNerds Adult Congenital Heart Disease (ACHD) series provides a comprehensive curriculum to dive deep into the labyrinthine world of congenital heart disease with the aim of empowering every CardioNerd to help improve the lives of people living with congenital heart disease. This series is multi-institutional collaborative project made possible by contributions of stellar fellow leads and expert faculty from several programs, led by series co-chairs, Dr. Josh Saef, Dr. Agnes Koczo, and Dr. Dan Clark.
The CardioNerds Adult Congenital Heart Disease Series is developed in collaboration with the Adult Congenital Heart Association, The CHiP Network, and Heart University. See more
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Pearls • Notes • References • Guest Profiles • Production Team
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https://www.youtube.com/watch?v=Ifu8nVtXT_c
Pearls
(1) In D-TGA following an atrial switch operation, the right ventricle IS the systemic ventricle!
(2) Evaluation of systemic right ventricular function often requires use of both transthoracic echocardiography and cardiac MRI.
(3) Use of medical heart failure therapies should be individualized, without any proven long-term mortality benefit and potential unique complications in this patient population (i.e. SA node dysfunction).
Show notes
D-transposition of the great arteries (D-TGA) is one of the most common forms of cyanotic congenital heart disease presenting in the newborn period. Anatomically, d-transposition of the great arteries is characterized by atrioventricular concordance and ventriculoarterial discordance, such that the aorta arises from the morphologic right ventricle and pulmonary artery arises from the morphologic left ventricle. The resultant physiology is that of a parallel circulation, with deoxygenated blood recirculating in the systemic circulation (via the RA-RV) and oxygenated blood recirculating in the pulmonary circulation (via the LA-LV). At birth, this invariably results in cyanosis, with survival dependent upon adequate mixing of the two circulations via an atrial or ventricular level defect.
Prior to surgical advances in the late 1950s, this lesion was uniformly fatal, with most infants dying before their first birthday. The subsequent development of the Senning and Mustard atrial-level repairs led to good immediate outcomes and improved long-term survival. However, following these “physiologic” types of repair, patients are far from cured, with several long-term established complications, including (1) dysfunction of the systemic right ventricle, (2) tricuspid regurgitation (the systemic atrioventricular valve), (3) atrial and ventricular arrhythmias, and (4) systemic and pulmonary venous baffles leaks and obstruction. These complications ultimately lead to substantial morbidity and premature mortality, with ACHD providers facing unique challenges in the medical and surgical management of this heterogenous patient population.
1. What are the basic anatomic features of d-transposition of the great arteries (d-TGA)?
