OBSbasic
Among the "4 Ts" of postpartum hemorrhage etiologies (Tone, Tissue, Trauma, and Thrombin), failure of the myometrium to contract effectively—termed uterine ________—is the most common cause of primary postpartum hemorrhage, accounting for approximately 70% to 90% of cases.
Answer
atony
Explanation
The supplied material gives a range of **70–90%** for Tone-related causes. This underscores why uterine contraction should be assessed promptly, while remembering to investigate other causes if bleeding continues. **Key takeaway:** Atony is common, but it is not the only cause.\n\n**Glossary:** **Tone**: uterine contraction and firmness.
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