Retrospective study of dystocia in mares at a referral hospital.
Authors: Norton J Lynch, Dallap B L, Johnston J K, Palmer J E, Sertich P L, Boston R, Wilkins P A
Journal: Equine veterinary journal
Summary
# Editorial Summary Dystocia outcomes in mares are critically time-dependent, yet evidence-based management protocols remain sparse in equine practice. Lynch and colleagues conducted a retrospective analysis of 71 dystocia cases at a university referral centre between 1991 and 2004, comparing outcomes before and after implementation of a coordinated dystocia management protocol (CDMP), stratified between emergency referral cases (EM) and high-risk pregnancy mares (HRP) that dystocia'd during hospitalisation. For emergency referrals, whilst the CDMP reduced time from hospital presentation to resolution by 32 minutes (P = 0.03), this did not translate to improved foal survival rates (10% vs 13% at discharge); however, foals delivered alive showed improved survival with the protocol (30% to 43% at discharge). Critically, median Stage II duration differed dramatically between foals delivered alive versus stillborn (71 vs 282 minutes) and between survivors and non-survivors to discharge (44 vs 249 minutes, P < 0.001), with HRP foals showing substantially better survival (79% at discharge). The findings underscore that whilst hospital-based protocols can streamline referral management, the timing of dystocia resolution—particularly the duration of Stage II labour—remains the primary determinant of fetal viability; consequently, early referral of suspected dystocia cases to centres with established protocols may prove more beneficial than attempting prolonged field management before transportation.
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Practical Takeaways
- •Early referral of dystocia cases to equipped centers matters more than reducing overall labor duration—every minute of Stage II affects fetal viability, with survival dropping significantly after 60-70 minutes
- •Mares identified as high-risk during pregnancy and managed at a facility should deliver there rather than at home, as survival rates nearly triple (79% vs 10-13%)
- •Implement a structured dystocia protocol at your facility; while it didn't change total labor duration in this study, it did reduce decision-to-resolution time and may improve outcomes with earlier intervention
Key Findings
- •Coordinated dystocia management protocol (CDMP) reduced time from hospital presentation to resolution by 32 minutes (P = 0.03) in emergency referral cases
- •Foal survival to discharge was only 10-13% in emergency referred dystocia cases, but 30-43% when foals were delivered alive
- •Median Stage II duration was significantly longer in non-viable foals (282 min) versus those delivered alive (71 min), and 249 min in foals not surviving to discharge versus 44 min in survivors (P < 0.001)
- •High-risk pregnancy mares managed proactively at the hospital achieved 79% foal survival to discharge, substantially better than emergency referral outcomes