Canis ISSN: 2398-2942

Primary uterine inertia

Synonym(s): Primary maternal dystocia

Contributor(s): Mushtaq Memon, Autumn P Davidson

Introduction

  • Primary uterine inertia is defined as the failure of the myometrium to ever establish a contractile pattern adequate to expel neonates from the uterus. 
  • Cause: unknown. There could be a genetic predisposition to primary inertia, as it has been documented in related bitches. 
  • Less common than secondary uterine inertia which has several etiologies Dystocia.
  • Signs: stage 1 labor is not initiated, even after the due dates have passed.
  • Diagnosis: primary uterine inertia can only be confirmed using tocodynamometry (uterine monitoring).
  • Treatment: caesarean section.
  • Prognosis: good if timely diagnosis and intervention.
Follow the diagnostic tree for Dystocia in the bitch Dystocia in the bitch.

Pathogenesis

Etiology

  • Failure of the myometrium to ever establish a contractile pattern adequate to expel neonates from the uterus.
  • The cause of this failure has not been discovered.

Predisposing factors

  • History of a previous apparent lack of labor is suggestive.

Pathophysiology

  • Serial tocodynamometry finds no evidence of developing uterine contractile patterns that will produce a vaginal delivery.

Timecourse

  • Critical that the diagnosis is made before fetal compromise occurs.
  • Breeders tend to present bitches 2-3 days after their believed due date has passed.

Diagnosis

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Prevention

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Outcomes

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Further Reading

Publications

Referred papers


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