A Tribute to Nick Short

It is with extreme sadness that we share the news that one of WikiVet’s founders, Nick Short, has passed away.

Nick was the driving force behind WikiVet and all that it stood for, and it is thanks to his vision, innovative approach and tireless enthusiasm and belief, that WikiVet is available as a free resource to veterinary professionals around the world today. Nick’s dedication and passion for veterinary education were truly inspirational and his very many friends, colleagues and students across the world have lost a true gem. He was an exceptional human being: gentle, good-natured, charming, generous and kind: he has left many legacies which will ensure that he will be remembered for many years.

Our thoughts are with his friends and family at this heartbreaking time. A book of remembrance has been set up for anyone that would like to leave a message of condolence for Nick and his family have asked that anyone who wishes to do so make a donation to BipolarUK, a charity that was close to Nick’s heart.

Uterine Inertia

From WikiVet English
Jump to navigation Jump to search
WikiVet LIVE - at the Virtual Congress 2021 - WikiVet has partnered with The Webinar Vet and created a student stream at the Virtual Congress 2021

There is a limited number of FREE tickets for students – on a first come first serve basis.


Uterine inertia describes the failure of the uterus to expel a foetus normally and is a common cause of canine and feline dystocia.

Uterine inertia can be primary or secondary.

Primary Uterine Inertia

This describes the total or partial absence of contractions to expel a normal foetus through an unobstructed birth canal.

Several causes have been found:

Breed predisposition
Large litter overstretching the uterus
Small litter not stimulating the uterus enough. Small foetuses cannot apply enough pressure on the uterine wall and cervix to set up the Fergusson reflex.
Systemic disease: Obesity and lack of exercise, hypocalcaemia, septicaemia.

Complete primary uterine inertia occurs if 2nd stage labour does not begin. Partial inertia occurs if the 2nd stage begins but contractions soon fail.

Secondary Uterine Inertia

Uterine muscles become exhausted after prolonged contraction against an obstructing or oversized foetus or during birth of a large litter. There is usually subclinical hypocalcaemia and/or hypoglycaemia.

This can occur in the sow, bitch and guinea pig.


Physical examination may help identify foetuses in the birth canal. Digital examination of the vagina will also enable the uterine and vaginal tone to be assessed.

Lack of a response to pressure per vaginum indicates a lack of the Ferguson reflex which indicates uterine intertia.

Radiography can be taken to assess the number and size of foetuses.

Ultrasound can help assess foetal viability.


If the bitch is in good condition with normal sized puppies and no obstruction, medical treatment can be attempted.

Oxytocin can be administered intramuscularly, repeated at 30 minutes for a maximum of 3 injections.

Calcium gluconate or dextrose solution can also be administered if a suspicion of hypocalcaemia or hypoglycaemia exists.

A caesarean section is indicated if there is no response to the oxytocin, or if the foetuses are too large for a vaginal birth.

See also: Clinical Approach to Dystocia in the Dog and Cat

Uterine Inertia Learning Resources
FlashcardsFlashcards logo.png
Test your knowledge using flashcard type questions
Small Animal Soft Tissue Surgery Q&A 12


Pasquini, C. (1999) Tschauner's Guide to Small Animal Clinics Sudz Publishing

Slatter, D. (2002) Textbook of small animal surgery Elsevier Health Sciences

Noakes, D. (2001) Arthur's Veterinary Reproduction and Obstetrics Elsevier Health Sciences

WikiVet® Introduction - Help WikiVet - Report a Problem