A client is receiving an epidural anesthesia during labor. Which observation is the most important adverse effect that the practical nurse (PN) should assess for following the administration of the epidural?

A. Maternal hypotension is a significant adverse effect of epidural anesthesia that can lead to decreased uterine blood flow and fetal distress. Monitoring for hypotension is critical to ensure both maternal and fetal well-being. B. While a vaginal hematoma is a potential complication, it is less immediately associated with the administration of epidural anesthesia compared to hypotension. C. A continuous headache could indicate post-dural puncture but is less common and not the primary immediate concern compared to hypotension following an epidural. D. Urinary retention can occur with epidural anesthesia, but maternal hypotension is a more urgent and significant immediate concern.