Boivin
Hypertension (pulmonary or systemic) can cause edema - not because the arterial pressure is high causing higher capillary pressure but because the increased afterload can increase hypertropy and increased EDV causing increased filling pressure of RV or LV leading to increased venous pressure. The high arterial pressure doesn't result in high capillary pressure because of the protection of the arterioles and pre-capillary sphincters.
Horses have large spleens that contract from sympathetic stimulation during racing. this can cause hematocrit to go from 45 to 65% greatly increasing viscosity of their blood and contributing to pulmonary hypertension/stress fracture.
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