Atony is by far the most common cause of postpartum hemorrhage. Uterine contraction is essential for appropriate hemostasis, and disruption of this process can ...ForYouNews&PerspectiveDrugs&DiseasesCME&EducationAcademyVideoSpecialty:MultispecialtyAllergy&ImmunologyAnesthesiologyBusinessofMedicineCardiologyCriticalCareDermatologyDiabetes&EndocrinologyEmergencyMedicineFamilyMedicineGastroenterologyGeneralSurgeryHematology-OncologyHIV/AIDSHospitalMedicineInfectiousDiseasesInternalMedicineMultispecialtyNephrologyNeurologyOb/Gyn&Women'sHealthOncologyOphthalmologyOrthopedicsPathology&LabMedicinePediatricsPlasticSurgeryPsychiatryPublicHealthPulmonaryMedicineRadiologyRheumatologyTransplantationUrologyMedicalStudentsNursesPharmacistsResidentsTodayonMedscapeEdition:ENGLISHDEUTSCHESPAÑOLFRANÇAISPORTUGUÊSLogInSignUpIt'sFree!Edition:ENGLISHDEUTSCHESPAÑOLFRANÇAISPORTUGUÊSRegisterLogInNoResultsNoResultsThursday,March25,2021ForYouNews&PerspectiveDrugs&DiseasesCME&EducationAcademyVideoclosePleaseconfirmthatyouwouldliketologoutofMedscape.Ifyoulogout,youwillberequiredtoenteryourusernameandpasswordthenexttimeyouvisit.LogoutCancelhttps://profreg.medscape.com/px/getpracticeprofile.do?method=getProfessionalProfile&urlCache=aHR0cHM6Ly93d3cubWVkc2NhcGUuY29tL2Fuc3dlcnMvNzk2Nzg1LTEyMjE1MS93aGF0LWlzLXRoZS1yb2xlLW9mLWF0b255LWluLXRoZS1ldGlvbG9neS1vZi1wb3N0cGFydHVtLWhlbW9ycmhhZ2UtcHBoprocessing....Drugs&Diseases>EmergencyMedicine>PostpartumHemorrhageinEmergencyMedicineQ&AWhatistheroleofatonyintheetiologyofpostpartumhemorrhage(PPH)?Updated:Jan02,2018Author:MaameYaaABYiadom,MD,MPH;ChiefEditor:BruceMLo,MD,MBA,CPE,RDMS,FACEP,FAAEM,FACHE more...ReferencesShareEmailPrintFeedbackCloseFacebookTwitterLinkedInGoogle+AnswerAtonyisbyfarthemostcommoncauseofpostpartumhemorrhage.Uterinecontractionisessentialforappropriatehemostasis,anddisruptionofthisprocesscanleadtosignificantbleeding.Uterineatonyisthetypicalcauseofpostpartumhemorrhagethatoccursinthefirst4hoursafterdelivery.Riskfactorsforatonyincludethefollo