| bas | basilar; basophil, basophilic |
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| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| BM | Bachelor of Medicine; barium meal; basal medium; basal metabolism; basement membrane; basilar membra... |
| RBA | relative binding affinity; rescue breathing apparatus; right basilar artery; right brachial artery; ... |
| RBAS | rostral basilar artery syndrome |
| vertebral-basilar artery disease | <cardiology> Aortic arch syndrome, also referred to by many as vertebral-basilar artery disease, carotid artery occlusive syndrome and subclavian steal syndrome is characterised by a constellation of signs and symptoms which occur secondary to abnormalities in the major arteries which extend off of the aortic arch. These abnormalities are structural and most often secondary to the effects of atherosclerosis, blood clots, trauma or a congenital abnormality. Symptoms of this condition include various neurologic symptoms, reduction in pulse and changes in blood pressure. (27 Sep 1997) |
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| vertebral-basilar system | The arterial complex comprising the two vertebral arteries joining to form the basilar artery, and their immediate branches. (05 Mar 2000) |