Partially correct, an asd is indeed a communcation with the left and rt atrium. For background, everyone has a whole there, its necessary for blood to flow during life in the womb, its there so umbilical blood can flow across into the left side of the heart which pumps it out to the body. The rt heart pumps blood to the lungs, but since you a living in fluid in the womb, the lungs dont breathe air. Typically the blood oxygenation is not a problem b/c the Left side is under higher pressure, it typically means that the oxygenated blood leaks L>R, not the other way around so the oxyenation on the right goes up, but the low o2 blood doesnt mix across. There is a risk of stroke from paradoxical embolus created in the legs, but if it is truly fixed then this wont happen.
The endocarditis is a risk if its open but, but only with dental work and IV shots, not IM- again this wont happen unless its still open or you. IF the asd is closed there is no greater risk to you than the general population of using AAS. This of course, is not to replace your physician, so Id recommend a bubble study with ultrasound at a cardiologist to be truly safe. They basically inject air into the vein and see if it crosses the septum using ultrasound. This is an interesting remnant from your embryo days. Usually they close by them selves shortly after birth and are more common than youd think. I see these alot especially in newborn hearts, especially if they are premature.
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