Studies examining risk factors associated with vasovagal reactions (VVRs) during autologous blood donations, especially in younger subjects, have been limited. The aim of the present study was to define risk factors for VVRs during preoperative autologous blood donation in patients, including those younger than 18 years old. We retrospectively analyzed 4,192 autologous, preoperative blood donations between 2007 and 2015 at Okayama University Hospital. Eighty-seven (2.08%) of the patients experienced VVRs. VVRs occurred approximately three times as often in patients 0-17 years old (16/320, 5.0%) than in patients 18 years and older (71/3,872, 1.8%). In particular, VVRs occurred more frequently in those 10-13 years old, and decreased with older age (P = 0.006). In a univariate analysis, younger age, lower body mass index, lower systolic blood pressure, lower body weight, lower total blood volume, female gender, first-time collection, and higher heart rate were associated with a higher incidence of VVRs. In a multivariate analysis, lower systolic blood pressure (P < 0.001), higher heart rate (P = 0.007), and first-time collection (P = 0.015), remained independent predictors of VVRs. These results emphasize the need for careful attention during blood collection.
Keywords: Autologous blood donation, vasovagal reactions 3
IntroducitonAutologous blood donation is widely used for preoperative blood preparation to reduce exposure to allogeneic blood [1]. Autologous and allogeneic blood donors occasionally experience adverse reactions during or after blood withdrawal, such as weakness, pallor, nausea, sweating, and fainting [2,3]. These symptoms are generally called "vasovagal reactions" (VVRs) [2,4]. However, the pathophysiology of VVRs is not yet completely understood [5]. Although risk factors for VVRs have been analyzed mainly in healthy allogeneic donors or peripheral blood stem cell donors [2,4,[6][7][8], reports describing patients undergoing autologous collection have been limited. In particular, there are few data concerning patients younger than 16-18 years old. In the present study, we analyzed the risk factors for VVRs during autologous donation in patients, including those younger than 18 years old, at a single institution.
Materials and methodsWe retrospectively collected medical information from 4,192 patients (groups I + II) who underwent autologous Patients were screened for vital signs, height, body weight, and complete blood count. Enrolled patients underwent whole blood phlebotomy in a designated room: blood volumes did not exceed 400 mL, or [body weight]/50 × 400 mL if the patient's body weight was less than 50 kg. All collections were conducted by a physician and nurse from the Department of Transfusion Medicine at Okayama University Hospital. An 18-gauge needle was inserted into an antecubital vein or a large forearm vein of each patient, and autologous blood was collected using a negative pressure blood drawing device (Hemoquick; Terumo, Tokyo, Japan). After phlebotomy, the patients were adm...