During epidural anesthesia in a preeclamptic parturient on magnesium therapy, sudden respiratory distress and pink froth in the endotracheal tube occur with IV leakage. The most likely diagnosis is?

During epidural anesthesia in a preeclamptic parturient on magnesium therapy, sudden respiratory distress and pink froth in the endotracheal tube occur with IV leakage. The most likely diagnosis is?

• A. Amniotic fluid embolism
• B. High spinal
• C. Intravascular bupivacaine injection
• D. Magnesium overdose

Answer: (A)

Amniotic fluid embolism is the diagnosis suggested by sudden, severe respiratory distress with pink, frothy endotracheal secretions in a parturient during delivery or the peripartum period. This event reflects abrupt pulmonary vasospasm and capillary leak leading to pulmonary edema and hypoxemia, often accompanied by hemodynamic instability and sometimes coagulopathy. In a preeclamptic patient on magnesium, the scenario can mimic other obstetric emergencies, but the pink froth from the endotracheal tube is a classic hint toward pulmonary edema from an embolic or leptomeningeal process rather than a localized spinal block, intravascular local anesthetic toxicity, or magnesium overdose alone. A high spinal would present with a rapidly evolving high sensory block and profound hypotension with apnea, typically without the pink frothy pulmonary secretions. Intravascular bupivacaine injection causes abrupt CNS and cardiovascular signs, not the characteristic pulmonary edema. Magnesium overdose causes respiratory depression and decreased reflexes but not the sudden, frothy pulmonary secretions seen with amniotic fluid embolism.

Amniotic fluid embolism is the diagnosis suggested by sudden, severe respiratory distress with pink, frothy endotracheal secretions in a parturient during delivery or the peripartum period. This event reflects abrupt pulmonary vasospasm and capillary leak leading to pulmonary edema and hypoxemia, often accompanied by hemodynamic instability and sometimes coagulopathy. In a preeclamptic patient on magnesium, the scenario can mimic other obstetric emergencies, but the pink froth from the endotracheal tube is a classic hint toward pulmonary edema from an embolic or leptomeningeal process rather than a localized spinal block, intravascular local anesthetic toxicity, or magnesium overdose alone. A high spinal would present with a rapidly evolving high sensory block and profound hypotension with apnea, typically without the pink frothy pulmonary secretions. Intravascular bupivacaine injection causes abrupt CNS and cardiovascular signs, not the characteristic pulmonary edema. Magnesium overdose causes respiratory depression and decreased reflexes but not the sudden, frothy pulmonary secretions seen with amniotic fluid embolism.