Which acute toxicity is characterized by nausea and vomiting that occurs before chemotherapy starts (anticipatory)?

Which acute toxicity is characterized by nausea and vomiting that occurs before chemotherapy starts (anticipatory)?

• A. Anaphylactic reactions
• B. Anticipatory nausea and vomiting
• C. Dysrhythmias
• D. Mucositis

Answer: (B)

Anticipatory nausea and vomiting is a learned, pre-treatment response. After prior chemotherapy experiences, cues in the treatment setting (like the clinic, IV setup, or even the smell of the room) can trigger nausea and vomiting before the next dose has begun. This makes it distinct from other acute toxicities that occur during or after the actual drug administration. The other options describe immediate or later effects of the treatment—anaphylactic reactions happen during exposure and can be life-threatening, dysrhythmias occur during infusion or due to drug effects on the heart, and mucositis develops days after therapy as mucosal tissues are damaged. So the preemptive nausea and vomiting described here best fits anticipatory nausea and vomiting. Management focuses on reducing anxiety and conditioning before treatment (for example, using low-dose benzodiazepines and behavioral strategies) in addition to continuing standard antiemetics during therapy to prevent the cycle.

Anticipatory nausea and vomiting is a learned, pre-treatment response. After prior chemotherapy experiences, cues in the treatment setting (like the clinic, IV setup, or even the smell of the room) can trigger nausea and vomiting before the next dose has begun. This makes it distinct from other acute toxicities that occur during or after the actual drug administration. The other options describe immediate or later effects of the treatment—anaphylactic reactions happen during exposure and can be life-threatening, dysrhythmias occur during infusion or due to drug effects on the heart, and mucositis develops days after therapy as mucosal tissues are damaged. So the preemptive nausea and vomiting described here best fits anticipatory nausea and vomiting. Management focuses on reducing anxiety and conditioning before treatment (for example, using low-dose benzodiazepines and behavioral strategies) in addition to continuing standard antiemetics during therapy to prevent the cycle.