Which sign or symptom is associated with eclampsia?

Eclampsia is characterized primarily by the occurrence of seizures in a pregnant woman. This serious condition arises as a complication of preeclampsia, where high blood pressure and signs of damage to other organ systems develop, typically after the 20th week of pregnancy. The seizures in eclampsia can occur as generalized tonic-clonic seizures, which significantly increase the risk to both the mother and the fetus if not properly managed.

The other options present conditions that do not align with the hallmark symptoms of eclampsia. Painless vaginal bleeding is more commonly associated with conditions like placenta previa or placental abruption. Hyperglycemia relates to diabetes, not eclampsia, which is specifically tied to blood pressure and seizure activities during pregnancy. Supine hypotensive syndrome occurs when a pregnant woman lies flat on her back, causing a reduction in blood flow to the uterus, but it does not involve seizures or relate to the definition of eclampsia. Therefore, the defining characteristic of eclampsia is the presence of seizures.