Hyperventilation as a Predictor of Blood Donation–Related Vasovagal Symptoms

Objective Most of the research on vasovagal reactions has focused on the contributions of cardiovascular activity to the development of symptoms. However, other research suggests that additional mechanisms like hyperventilation may contribute to the process. The goal of the present investigation was to examine the influences of cardiovascular and respiratory variables on vasovagal symptoms. Methods This study was part of a randomized controlled...