Which of the following is true about postretrobulbar block apnea syndrome?

Postretrobulbar block apnea syndrome is characterized by a rapid onset of symptoms following the injection of local anesthetic into the retrobulbar space, which is the area behind the eyeball. This syndrome can potentially lead to respiratory depression or apnea due to complications arising from the block. The rapid occurrence of symptoms is linked to the direct effects of the anesthetic on neural pathways that control respiratory function.

In contrast, the other statements do not accurately describe the nature of this syndrome. While the effects of the block can be serious, the condition is not permanent, nor is it generally considered fatal. Additionally, it can indeed impact consciousness depending on the severity of respiratory compromise, making the statement about its lack of impact on consciousness misleading. The quick onset of apnea following the injection is a particularly concerning aspect of the syndrome, as it requires immediate medical intervention. Thus, recognizing that the symptoms can develop rapidly after the procedure highlights the importance of vigilance during these types of regional anesthesia.