Epidural Anesthesia

Which of the following structures forms the posterior boundary of the epidural space in the lumbar region?

A 35-year-old primigravida receives an epidural for labor analgesia. Shortly after the bolus dose, she develops sudden profound hypotension, bradycardia, and difficulty breathing, followed by loss of consciousness. Which of the following is the most likely complication?

Which of the following is an absolute contraindication to the placement of epidural anesthesia?

The primary mechanism by which local anesthetics administered into the epidural space produce their analgesic and anesthetic effects is by:

During the placement of an epidural catheter, the 'loss of resistance' technique is used to identify the epidural space. Which of the following best describes the sensation felt when the needle enters the epidural space using this technique?