The platform of the PPH Butterfly rests just beneath the uterine cervix (shown as a red dotted line above). The platform of the PPH Butterfly rests just beneath the uterine cervix (shown as a red dotted line above). Bleeding from above the red line is usually due to uterine atony and will stop abruptly with uterine compression. That from below the red line is from vaginal lacerations and blood loss will continue even with uterine compression. PPH, postpartum haemorrhage. Caroline Cunningham et al. BMJ Innov doi:10.1136/bmjinnov-2016-000144 Copyright © BMJ Publishing Group Ltd & British Cardiovascular Society. All rights reserved.