Final answer:
The definition of a massive obstetric hemorrhage usually refers to excessive blood loss inconsistent with normal physiological compensatory mechanisms, often requiring medical intervention such as blood transfusions. Blood loss of 2,000 ml after a cesarean birth, is in line with the definition of a massive obstetric hemorrhage. The correct answer is option C.
Step-by-step explanation:
The definition of a massive obstetric hemorrhage involves significant blood loss during childbirth that cannot be controlled by the body's normal hemostatic mechanisms and often necessitates medical intervention. Specifically, it refers to blood loss over what can be compensated for by usual physiological processes. Since slight blood loss can be managed by hemostasis and repair, a significant loss requiring multiple blood transfusions indicates a severe and life-threatening condition.
A common threshold for defining a massive obstetric hemorrhage is blood loss exceeding 1,000 ml, and particularly blood loss of 2,000 ml (67.6 oz) after a cesarean birth would meet this criterion. Furthermore, a transfusion of multiple units of blood is a clear indication of massive hemorrhage, as it shows the need to restore blood volume rapidly to prevent the dangerous effects of hypovolemia.
Therefore, option c, which mentions blood loss of 2,000 ml (67.6 oz) after a cesarean birth, is consistent with the definition of a massive obstetric hemorrhage.