## Revealed vs. Concealed Abruptio Placentae **Key Point:** Concealed hemorrhage occurs when blood is trapped behind the placenta and does not escape through the vagina, leading to a discrepancy between clinical severity and visible blood loss. ### Classification and Clinical Features | Feature | Revealed Hemorrhage | Concealed Hemorrhage | | --- | --- | --- | | Vaginal bleeding | Visible, often profuse | Minimal or absent | | Uterine appearance | Soft, tender | Firm, board-like, tense | | Maternal shock | Correlates with visible loss | Disproportionate to visible loss | | Fetal distress | May be present | Often present despite minimal bleeding | | Coagulopathy risk | Moderate | High (>500 mL concealed blood) | | Frequency | ~80% of cases | ~20% of cases | | Maternal mortality | Lower | Higher | ### Pathophysiology of Concealed Hemorrhage 1. Blood accumulates in the potential space between placenta and uterine wall 2. Uterus becomes distended and firm ("board-like") 3. Blood does not drain through cervix 4. Severe shock develops from occult blood loss 5. Thromboplastin leaks into maternal circulation → DIC **High-Yield:** A pregnant woman with severe shock, fetal distress, and a board-like uterus but *minimal vaginal bleeding* = concealed abruptio placentae. This is a medical emergency. **Mnemonic:** **CONCEALED** = **C**ontained behind placenta, **C**oagulopathy risk, **C**ritical shock with minimal blood visible. **Clinical Pearl:** Concealed abruptio is more dangerous than revealed because: - Massive blood loss is hidden - DIC develops rapidly from thromboplastin exposure - Maternal mortality is 5–10 times higher - Fetal mortality approaches 50–60%
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.