| ATB | at the time of the bomb [A-bomb in Japan]; atrial tachycardia with block |
|---|---|
| AVB | atrioventricular block |
| BBB | blood-brain barrier; blood buffer base; bundle-branch block |
| BBBB | bilateral bundle-branch block |
| BD | barbital-dependent; barbiturate dependence; base deficit; base of prism down; basophilic degeneratio... |