Treatment may include any combination of:

Surgery
Minor
Cardiac catheterization
Rashkind balloon atrial septostomy
Balloon angioplasty
Endovascular stenting
Angiography
Cardiac catheterization is a minimally invasive procedure which provides a means of performing a number of other procedures.A balloon atrial septostomy is performed with a balloon catheter, which is inserted into a patent foramen ovale (PFO), or atrial septal defect (ASD)  and inflated to enlarge the opening in the atrial septum; this creates a shunt which allows a larger amount of oxygenated ("red") blood to enter the systemic circulation. Angioplasty also requires a balloon catheter, which is used to stretch open a stenotic vessel; this relieves restricted blood flow, which could otherwise lead to congestive heart failure (CHF). An endovascular stent is sometimes placed in a stenotic vessel immediately following a balloon angioplasty to maintain the widened passage. Angiography involves using the catheter to release a contrast medium into the chambers and/or vessels of the heart; this process facilitates examining the flow of blood through the chambers during an echocardiogram, or shows the vessels clearly on a chest x-ray, MRI, or CT scan - this is of particular importance, as the coronary arteries must be carefully examined and "mapped out" prior to the corrective surgery. It is commonplace for any of these palliations to be performed on a d-TGA patient.
Additionally, some individuals may require ongoing medication therapy at home, which may include diuretics (such as furosemide or spironolactone), analgesics (such as paracetamol), cardiac glycosides (such as digoxin), anticoagulants (such as heparin or aspirin), or other medications. If the individual has undergone stenting, an anticoagulant will be a necessity to prevent build-up around the stent(s), as the body will perceive the foreign body as a wound and attempt to heal it. Some patients who had alternate corrective surgery, such as the Mustard or Senning procedure, may have issues with SA and VA nodal transmissions in later life. Typical symptoms include palpitations and problems with low heart rates. This is commonly solved with a Pacemaker unit, providing scar tissue from the original operation does not block its functionality. More recently, ACE inhibitors have been prescribed to patients in the hope of relieving stress on the heart. Prognosis
With simple d-TGA, if the foramen ovale and ductus arteriosus are allowed to close naturally, the newborn will likely not survive long enough to receive corrective surgery. With complex d-TGA, the infant will fail to thrive and is unlikely to survive longer than a year if corrective surgery is not performed.