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==Signalment==
==Signalment==
Foals younger than 6 months in poor condition, on a poor worming schedule and with a heavy parasite burden. Adult horses demonstrate age-related immunity from around 15 months.
Foals younger than 6 months in poor condition, on a poor worming schedule and with a heavy parasite burden. Adult horses demonstrate age-related immunity which starts to develop from around 6 months and is substantial by about 15 months depending on worm exposure.
==History==
==History==
Recent history (within the previous 24 hours) of being wormed with a product that causes sudden ascarid death.
Recent history (within the previous 24 hours) of being wormed with a product effective against ascarids.
==Aetiology==
==Aetiology==
*Piperazine
*Piperazine
==Clinical Signs==
*Acute onset mild to severe colic after administration of anthelmintic (onset varies with degree of obstruction (37))
*Acute onset mild to severe colic after administration of anthelmintic (onset varies with degree of obstruction (37))
*Signs compatible with [[Colic Diagnosis - Clinical Signs|small intestinal obtruction]]
*Signs compatible with [[Colic Diagnosis - Clinical Signs|small intestinal obtruction]]
==Treatment==
==Treatment==
*[[Colic, Medical Treatment|'''Medical treatment:''']] immediate treatment of hypovolaemic shock resulting from sequestration of fluid in small intestine
*[[Colic, Medical Treatment|'''Medical treatment:''']] immediate treatment of hypovolaemic shock resulting from sequestration of fluid in small intestine
*'''Surgical treatment:''' enterotomy made over the intraluminal impaction and removal of ascarids
*'''Surgical treatment:''' enterotomy made over the intraluminal impaction and removal of ascarids
==Prognosis==
==Prognosis==
Fair in cases that are rapidly treated but poor in foals with evidence of hypovolaemia and septic shock. Surgical cases also carry a poorer prognosis than cases which are resolved medically. In a recent study, long term survival of 25 affected horses was 33%(37). Failure to relieve the impaction may lead to intestinal rupture.
==Prevention==
==Prevention==