2.2.14 Pressure overload
Pressure overload is common in humans, as a result of acquired disease such as rheumatic valvular disease and systemic hypertension. In small animals it usually results from congenital heart disease. In horses, pressure overload is very rare. Pressure overload of the right ventricle has been reported in severe pulmonary disease as a result of pulmonary hypertension (cor pulmonale), but is not well recognised as a disease entity in its own right. The most common cause of pulmonary hypertension in horses is left-sided CHF, and this rapidly leads to signs of right-sided CHF.