CD4 counts should be monitored weekly during therapy with?
**Core Concept**
During therapy with certain medications, CD4 counts should be closely monitored to prevent severe immunosuppression and opportunistic infections. This is particularly relevant for medications that significantly suppress the immune system.
**Why the Correct Answer is Right**
Interferon-alpha, a type of cytokine, is used to treat various conditions such as viral infections, autoimmune diseases, and some cancers. However, it can have a profound effect on the immune system, particularly on CD4+ T lymphocytes. Interferon-alpha can cause significant immunosuppression by decreasing the production of CD4+ T cells and impairing their function. Monitoring CD4 counts weekly during therapy with interferon-alpha helps clinicians identify potential immunosuppression and adjust treatment accordingly.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because while corticosteroids can suppress the immune system, they are not typically associated with a rapid decline in CD4 counts. Corticosteroids can affect various aspects of the immune response, but their effects on CD4 counts are generally not as pronounced as those of interferon-alpha.
* **Option B:** This option is incorrect because antiretroviral therapy (ART) is actually used to increase CD4 counts in individuals with HIV infection. ART works by suppressing the replication of HIV, allowing CD4+ T cells to recover and increasing the immune system's ability to fight off opportunistic infections.
* **Option C:** This option is incorrect because while chemotherapy can cause immunosuppression, it is not typically associated with a rapid decline in CD4 counts. Chemotherapy can affect various aspects of the immune response, but its effects on CD4 counts are generally not as pronounced as those of interferon-alpha.
**Clinical Pearl / High-Yield Fact**
When initiating therapy with interferon-alpha, clinicians should closely monitor CD4 counts weekly for the first 4-6 weeks to identify potential immunosuppression. This is a critical period during which the immune system may be most vulnerable to the effects of interferon-alpha.
**Correct Answer: A. Interferon-alpha**