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Flashcards in Abortion in Horses Deck (20)
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1

What is placentitis in horses commonly caused by?

Strep spp and E. coli

2

What is the most commonly incriminated viral cause of abortion in horses?

EHV-1 (herpesvirus)

3

When during gestation will EHV-1 cause abortion?

Latter part

4

When should an EHV-1 vaccine be administered to prevent abortion?

5, 7, 9 months of gestation

5

What is the most common non-infectious cause of abortion in horses?

Twinning

6

Major cause of abortion in mares during the latter stages of pregnancy

Placentitis

7

What is the most common route in which bacteria are introduced to the uterus?

Ascending infections

8

What pathophysiological aspect of placentitis causes abortion?

Detachment of placenta @ cervical star region, inflammation

9

How do you treat placentitis in a mare?

Abx, NSAIDs, progesterone, clenbuterol

10

What is the outcome of placentitis?

Variable - abortion to healthy foal to septic foal

11

What herpes virus of horses causes equine viral arteritis?

EHV-4

12

What induces abortion in an EHV-1 infection?

Rapid placental detachment

13

How might a fetus become infected with EHV-1?

Chorionic vasculature or inhaling infected amniotic fluid

14

How will an aborted EHV-1 fetus present at necropsy?

Small necrotic liver foci, necrotizing broncholitis, intranuclear inclusion bodies

15

What clinical signs in a newborn foal indicate it might be infected with EHV-1?

Respiratory distress, icterus, fever, lethargy

16

What type of placenta does a mare have?

Diffuse microcotyledonary

17

Why is it unlikely for twinning to carry to term in a mare?

Limited endometrial surface space for allantochorion attachment

18

If twin fetuses are carried to term, how are they affected?

Stunted in growth and size from intrauterine growth retardation

19

What is a relatively uncommon cause of abortion in mares and results from a rotating fetus?

Umbilical torsion

20

What does twisting of the umbilical cord result in?

Constriction of normal flow through cord, edema, hemorrhage, thrombosis