Shoulder surgery is often performed with @entity1 in the sitting position under interscalene block anesthesia. Vasovagal episodes, characterized by a @entity551 , have a reported incidence of 17%-24% in this setting. We performed a retrospective study to determine whether there was an association between the use of beta-adrenergic blockers and the incidence of these episodes. Of the 150 @entity1 identified, 20 (13.3%) had a vasovagal event. Similar proportions of @entity1 had received @entity477 -adrenergic blocker in the group who had a vasovagal event compared with those who did not (20% vs 18%; P = 0.95). No other differences could be identified. We conclude that @entity2749 occur frequently in this setting with no identifiable risk factors. Beta-adrenergic blockers were not associated retrospectively with either an increased or decreased incidence of these episodes. The most likely mechanism involves the Bezold-Jarisch reflex. IMPLICATIONS: In this retrospective study of 150 @entity1 who underwent shoulder surgery in the sitting position under interscalene block, we found a 13% incidence of @entity2749 . Unlike a previous study, this was not affected by the use of beta-blockers. A randomized, prospective study is necessary to clarify this issue.

Beta-adrenergic blockers and XXXX during shoulder surgery in the sitting position under interscalene block.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity551 :: ('MESH:D007022', 'Disease') :: ['sudden decrease in heart rate and/or blood pressure'] @entity2749 :: ('MESH:C580065', 'Disease') :: ['vasovagal episodes'] @entity477 :: ('351', 'Gene') :: ['a beta']
@entity2749 :: (MESH:C580065,Disease) :: ['vasovagal episodes']
