|when to start treatment?
Feb 8, 2004
Two questions: 1)After how long can lypoatrophy be expected to appear on a young adult who starts on a regimen of Sustiva and Combivir? Does Viread have a better profile on this issue? Are we talking of years or can it be months? 2)Is it true that delaying therapy until 350CD4 can cause irreparable qualitative (rather than quantitative)damage to the immune system that would be avoided if treated as soon as diagnosed? Some doctors tell me to start asap and some others to wait! What to do?! (I was infected may 2003). Thank you.
Response from Dr. Young
Thanks for your question.
Avoidance of side effects and toxicities are very important considerations in deciding when and what to start for the treatment of HIV.
Combivir (AZT/3TC) and Sustiva (efavirenz) is a very popular and guideline-endorsed starting regimen. Another popular regimen is tenofovir (Viread) with either 3TC (Epivir) or FTC (Emtriva). The combo of tenofovir with 3TC has been extensively studied with efavirenz, and shows very little emergence of lipoatrophy, even after 2 years of treatment. By contrast, patients who started on d4T (Zerit) had measurable amounts of lipo, even after one year of therapy.
Where does AZT fit into this? There are some studies that suggest that the risk of lipoatrophy from AZT is there, but considerably less than d4T. This might give a rank risk of d4T>>AZT>tenofovir. It's also key to remember that other factors might contribute negatively to lipoatrophy-- in particular, having a very low CD4 count, and duration of HIV disease. Overall, I'd suggest that the overall rate of appearance of lipo is delayed-- typically many months.
Now, as for immune damage-- there is certainly quantitative damage, as measured by lower CD4 counts, that does translate to some qualitative damage too. However, much of this later "damage" appears to reverse-- at least as measured by the reduction of risk of opportunistic infections once CD4 counts rise.
If you were infected in May 2003, it's been many months since your acute infection. As such, the qualitative benefit of preserving HIV-specific immunity (as opposed to other aspects of immunity)is probably irreversibly damaged, and thus, there isn't an urgent need to start therapy. Most experts in the subject of treatment of acute HIV infection recommend starting within the first 6 months (if not sooner) after the initial infection.
I hope this helps. Thanks for reading. BY
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