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Location: Preesall, Lancashire
Joined: Feb 2006
Posts: 5,622
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19-06-2007, 12:36 PM
Primary Inertia?
What is it, and what causes it?I've had a look on t'internet, and a lot of the stuff is too complicated for my brain!
Does anyone have any knowledge, or any good links etc?
Thanks!
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Location: With the fairies in the garden
Joined: Jan 2007
Posts: 11,519
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19-06-2007, 01:01 PM
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Location: With the fairies in the garden
Joined: Jan 2007
Posts: 11,519
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19-06-2007, 01:37 PM
Originally Posted by IsoChick 
Thanks DK!
What about when there are a large number of puppies (i.e. a normal litter size)?
Is it caused by something particular, or is it "one of those things" that can happen to any bitch?
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Location: Preesall, Lancashire
Joined: Feb 2006
Posts: 5,622
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19-06-2007, 01:38 PM
So not enough, or too many pups, and the uterus can't contract and push them out.
Presumably, if there are an average number of pups, but they are all big, this can cause it too?
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Location: east sussex UK
Joined: May 2005
Posts: 1,662
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19-06-2007, 02:25 PM
in particular:
Uterine inertia is by far the most common cause of dystocia in dogs. It is classified into primary and secondary inertia. Primary complete uterine inertia is the failure of the uterus to begin labor at full term. Primary partial uterine inertia occurs when there is enough uterine activity to initiate parturition but it is insufficient to complete a normal birth of all fetuses, in the absence of an obstruction. Primary inertia can also be due to that the uterus fails to respond to the fetal signals because there are only one or two pups and thus insufficient stimulation to initiate labor (the single-pup syndrome) or because of overstretching of the myometrium by large litters, excessive fetal fluids, or oversized fetuses. Other causes of primary inertia may be an inherited predisposition, nutritional imbalance, fatty infiltration of the myometrium, age-related changes, deficiency of neuro-endocrine regulation, or systemic disease in the bitch. Secondary uterine inertia implies that some fetuses have been delivered while the remaining ones are left in utero due to exhaustion of the uterine myometrium caused by obstruction of the birth canal; this condition should be clearly distinguished from primary inertia [see [6]]. In the study by Darvelid & Linde-Forsberg (1994) [1] 72.0% of the bitches suffered from primary uterine inertia, compared to 42.1% of the bitches in the study by Gaudet (1985) [2].
hth
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