Definition of primary and secondary amenorrhea. Amenorrhea is the medical term for the absence of menstrual periods, either on a permanent or temporary basis. Amenorrhea can be classified as primary or secondary.
Most inherited bleeding disorders are the result of abnormal platelet function or a deficiency in one or more of the factors involved in the blood clotting system. The most serious and common inherited coagulation disorders in dogs are hemophilia(deficiency of factor VIII or IX) and von Willebrand's disease (lack of von Willebrand factor). Other coagulation disorders are discussed here.
Von Willebrand's Disease (vWD). Von Willebrand's disease has been identified in a wide range of canine breeds, and is the most common of the inherited bleeding disorders.As with humans, there are three classifications of this disease, Types I, II, and III.ype III vWD is found in animals that have essentially no plasma vWF. The disease has been reported in many breeds of dog, and is generally diagnosed by an ELISA test for plasma vWF following a bleeding event. Five mutations have been identified that cause vWD in canines.