Final answer:
Flumazenil should be administered to counteract the symptoms of lorazepam overdose. It acts as an antidote by reversing the sedative and respiratory depressive effects of benzodiazepines. Other listed medications are not appropriate for benzodiazepine overdose.
Step-by-step explanation:
The nurse should anticipate administering Flumazenil in response to the severely decreased respiratory rate (RR) and low blood pressure (BP) indicative of lorazepam overdose. Lorazepam is a type of benzodiazepine used to treat anxiety by exerting a calming effect on the central nervous system. Flumazenil acts as an antidote by reversing the effects of benzodiazepines, which can include sedation and respiratory depression. The other medications listed, namely Naloxone, Acetylcysteine, and Atropine, are used to treat other types of poisoning or conditions and would not be appropriate in this case.
Benzodiazepines, including lorazepam, can lead to central nervous system depression resulting in symptoms such as a significantly slowed respiratory rate and reduced blood pressure. Flumazenil is administered as the antidote to this overdose, as it can specifically counteract the actions of benzodiazepines on the central nervous system. It is important that healthcare providers carefully monitor the client's vitals signs and administer the proper antidote promptly to prevent severe complications or potential fatality from benzodiazepine overdose.