Development and validation of a scoring system to predict vasovagal reaction upon whole-blood donation.

Background And Objectives: Risk factors for vasovagal reaction (VVR) have been extensively studied. With knowledge of the relative importance of these risk factors for VVR, collection staff could take care of blood donors from the same standpoint, leading to improved donor safety. We therefore developed a scoring system to predict VVR, which incorporates registration information.

Syncopal-type reactions tend to be delayed and result in falls among elderly blood donors.

Background: Delayed syncopal-type complications are infrequent among blood donors, but sometimes have critical consequences, such as severe injury. We retrospectively investigated the characteristics of donors with delayed syncopal-type complications or falls.

Study Design And Methods: We defined a delayed reaction (DR) as syncopal-type complications occurring >20 min after needle removal.