Successful blood transfusion in a Holstein cow experiencing hemorrhagic shock under general anesthesia.

A 2-year-old Holstein cow weighing 530 kg at 2 mo gestation was scheduled for a paracostal laparotomy and abomasotomy following diagnosis of a reticular foreign body causing obstruction and abomasal impaction. Hemorrhagic shock occurred during surgery, with a rapid, approximately 60% decrease in arterial blood pressure, and reflex tachycardia with a 2-fold increase in heart rate. Following identification of hemorrhagic shock, arterial blood pressure was supported by reducing the inhalant anesthetic requirement, positive inotropic support (IV dobutamine infusion), and IV fluid therapy.