APHON Principles of Chemotherapy and Biotherapy 2025 – 400 Free Practice Questions to Pass the Exam

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What happens to patient susceptibility during the nadir phase?

They become less likely to develop infections

They are most susceptible to infection

During the nadir phase, which typically occurs 7 to 14 days after chemotherapy administration, patients experience the lowest point of their white blood cell count, particularly neutrophils. This reduction in neutrophil levels significantly compromises the immune system's ability to respond to pathogens, making patients extremely vulnerable to infections. The decrease in these critical immune cells means that the body is less equipped to fight off bacterial, viral, or fungal infections, leading to a heightened susceptibility during this period. Therefore, the correct response accurately reflects the increased risk of infection that patients face during the nadir.

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They experience no change in susceptibility

They have increased energy levels

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