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Low Cd 4 count (CD4 COUNTS NOT INCREASING DESPITE UNDETECTABLE VIRAL LOAD, 2009)
Jul 18, 2009

6/28/07 I tested hiv positive. At the time viral load was 145000 and cd4 was 50. I was put on atripla and one month later I was undectable and cd4 was 255. Its been two years now of being undectable and the cd4 is not going up. The range over the last 2 years for my cd4 has been 198 to 260, my last cd 4 was 223. Why is it not going up? I have been depressed and started Zolot 100mg. Could depression keep the cd4 count down? Does the Sustiva in atripla cause depression? Would a protease inhibitor help?

Response from Dr. Frascino

Hello,

Dr. Henry already addressed your question regarding lack of immune reconstitution despite driving HIV plasma viral load to undetectable levels for a considerable period of time. I'll reprint his response below. I completely agree with his comments. I'll also post below some recent information about lymph node fibrosis, which, I believe, may well be the main culprit responsible for your CD4 counts not increasing.

Depression would not be the cause of your CD4 counts not having risen as expected. Sustiva can exacerbate some types of depression. I tend not to recommend Sustiva in folks who are experiencing significant depression. Would a protease inhibitor help? Possibly. It may be worth a try for two reasons. First it will allow you to discontinue Sustiva (in light of your depression) and second it may result in improved immune reconstitution.

Good luck!

Dr. Bob

Cd 4 Count not going up Jul 7, 2009

6/28/07 I tested Hiv Positive and one week later my doctors found my cd 4 count to be 50 and my viral load to be 145,000. I was told i probably had the virus for about 6 to 8 years without knowning. They immediately put me on Atripla and Bactrim DS and one month later I was undectable and cd 4 was 255. Six months later I was taken off Bactrim. Its been two years of being undectable now, and my cd4 count is not going up. The cd 4 count range over the last two years has been 203 to 260, my last cd4 was 223 and still undectable. Why is my cd4 count not improving?

Response from Dr. Henry

There are many reasons why the CD4 count may not recovery well despite good HIV suppresssion. Possibilities include poor thymus function, genetic factors (HLA and CCR5 and other markers), destroyed lymphoid tissues architecture, ongoing immune activation, and others. Patients seem to do better with suppressed virus levels even when the CD4 recovery is poor compared to patients not taking ART so treatment still has a positive clinical effect. Your situation is not that uncommon and is a strong argument for identifying HIV infection early and starting treatment at higher CD4 counts. KH

Falling CD4 despite undetectable viral load?????? Jun 25, 2009

Dr. Bob,

My HIV doc is totally stumped!!!! I'm on HAART and my viral load has been undectctable for over a year and yet my CD4's are continuing to decline. Is there any scientific rational for why this is happening???

Thanks,

Coltman

Response from Dr. Frascino

Hi,

Yes, but it is preliminary information and rather complex. Simply put the latest research indicates the cause may involve fibrosis in the lymph nodes. This research is preliminary but HIVers whose normal lymph node architecture has been replaced with collagen appear to be most at risk. I'll reprint some information about this topic below.

Dr. Bob

The Puzzle of CD4-Cell Depletion Despite Good Viral Suppression In some patients, CD4-cell counts fail to rise as expected. Could extensive lymph node fibrosis be responsible?

We expect that when combination antiretroviral therapy (ART) suppresses a patient's HIV viremia, a steady increase in CD4-cell count will ensue. In some patients, however, such increases are minimal or fail to occur, and in others, CD4-cell counts plummet after an initial rise, even though viral load remains undetectable. The combination of ddI and tenofovir has been associated with these aberrant CD4-cell responses, but the underlying mechanism is unclear, and the phenomenon is also seen in patients taking other drugs.

In a recent study, NIH researchers sought evidence to support any of several hypothetical explanations for the aberrant CD4-cell responses seen in four patients on combination ART whose CD4 counts had fallen from a median of 719 cells/mm3 to a median of 227 cells/mm3 despite persistently undetectable plasma viral loads. Three of the four patients were receiving a regimen containing tenofovir and ddI.

Residual replicating HIV did not seem to be the problem: Results of ultrasensitive PCR and assays for peripheral blood mononuclear cellassociated HIV RNA and proviral HIV DNA and of assays for cell-associated HIV RNA and proviral DNA in mononuclear cells from inguinal lymph nodes were similar to those obtained in other, successfully treated patients. Thymic production of naive CD4 cells was similar to that seen in successfully treated age-matched controls. No evidence of occult drug resistance sabotaging treatment was found. Changing ART regimens to avoid the tenofovir/ddI combination had little effect on CD4-cell counts during the follow-up period (median duration, 10 months).

The single unusual finding was a striking abnormality in inguinal lymph node architecture in the four patients: From 24% to 34% of the T-cell zone was replaced by collagen. In contrast, collagen levels in six successfully treated patients have been reported to range from 2% to 12% (J Clin Invest 2002; 110:1133).

Comment: We do not know the exact pathogenesis of CD4-cell depletion in untreated HIV infection, so creating logical hypotheses to explain aberrant CD4 responses is especially challenging. These authors offer the intriguing suggestion that the unusual lymph node architecture documented in all four patients in this study may be related to (or even responsible for) the inadequate CD4-cell response i.e., that CD4-cell depletion is independent of specific components of an antiretroviral regimen and is instead caused by lymph node fibrosis. They note that such architectural damage may well be "clinically irreversible with currently available interventions."

Abigail Zuger, MD

Published in AIDS Clinical Care June 1, 2009



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