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Hemophilia A in two related quarter horse colts
1South Plains Veterinary Clinic, Slaton, TX 79364.
Insights
Two Quarter Horse colts were diagnosed with hemophilia A (factor VIII:C deficiency), a genetic bleeding disorder. This condition caused severe hemorrhages, including fatal intra-abdominal bleeding and life-threatening cranial cervical hematoma.
Area of Science:
- Veterinary Medicine
- Hematology
- Equine Genetics
Background:
- Hemophilia A is an X-linked recessive disorder characterized by a deficiency in coagulation factor VIII:C.
- Genetic defects in coagulation factors can lead to severe bleeding disorders in horses.
- Understanding inherited coagulation disorders is crucial for equine health management.
Observation:
- Two related Quarter Horse colts presented with severe hemorrhagic diathesis.
- Clinical signs included dyspnea and dysphagia due to cranial cervical hematoma in one colt.
- The second colt experienced fatal intra-abdominal hemorrhage.
Findings:
- Coagulation studies revealed a prolonged activated partial thromboplastin time with normal prothrombin time and bleeding time, indicative of intrinsic pathway defects.
- Factor VIII:C deficiency was confirmed through specific assays.
- The inherited nature of hemophilia A was consistent with the affected related colts.
Implications:
- This case highlights the importance of recognizing hemophilia A in equine practice.
- Early diagnosis and genetic counseling are vital for affected bloodlines.
- Further research into equine coagulation disorders can improve diagnostic and therapeutic strategies.
Abstract:
Severe hemorrhagic diathesis caused by hemophilia A (factor VIII:C deficiency) was diagnosed in 2 related Quarter Horse colts. Clinical signs consisted of dyspnea and dysphagia attributable to cranial cervical hematoma in one colt and to intra-abdominal hemorrhage resulting in death of the second colt. Factor VIII:C deficiency, a defect of the intrinsic coagulation pathway, is suggested by results of coagulation studies--prolonged activated partial thromboplastin time, normal prothrombin time, and normal primary bleeding time. The diagnosis was confirmed by results of factor VIII:C assays. Hemophilia A is inherited as an X chromosome-linked trait.