Describes a specific pathology of acquired aortic ring rupture in stallions, likely related to breeding-induced blood pressure spikes.
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May inform differentials for collapse in breeding stallions; hypothesis-generating for preventive strategies.
Eight cases of acquired rupture of the aortic ring in the right coronary sinus with dissection (cardioaortic fistula) into the interventricular septum and into the right ventricle have been described in stallions. It is postulated that the ruptures are due to increased blood pressure during breeding and the direction of a recoiling column of blood against an area of anatomic weakness.
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Rooney et al. (1967) studied this question.
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