Stopping a Pill That's Been Working Fine
His CD4 count clears the discontinuation threshold today, comfortably. Whether it has done so for the length of time the guideline actually asks for depends on how one dip four months ago gets read.
P.V., a 44-year-old man, manages a small hardware store his family has run for three generations, work he took over from his father five years ago and has kept largely unchanged since, down to the same hand-lettered sign in the front window. He was diagnosed with HIV eighteen months ago after presenting with a case of PCP that put him in the hospital for a week, a diagnosis that also revealed the HIV he hadn't known he had. He started ART at that admission and has taken it consistently since, alongside daily trimethoprim-sulfamethoxazole for PCP prophylaxis, a pill he says he'd honestly like to stop taking given how sick the actual infection made him the one time he had it. He describes that hospitalization as the sickest he's ever been in his life, and says it's part of why he's never missed a dose of anything since — a level of motivation his chart's own refill history bears out.
His CD4 count has recovered steadily on ART — 312 cells/µL at his visit today, and 298 three months ago — both comfortably above the 200-cell threshold current guidelines use for discontinuing PCP prophylaxis once that level has been sustained for at least three months. What he is on is secondary prophylaxis: he is being protected against a second episode of a pneumonia he has already had once. The guideline threshold happens to be identical for both forms, which is why the distinction so rarely gets stated out loud, and why the number in front of the team tonight carries more weight than the same number would in someone who had never been sick. The complication sits one check further back: four months ago, in the middle of a documented case of influenza, his CD4 dipped to 178, below threshold, before recovering at his next visit. Read one way, that dip resets the three-month clock, meaning he has only been reliably above 200 for a little over a month. Read the other way, a single value coinciding with a known acute viral illness is a plausible, explainable blip rather than evidence his immune recovery isn't genuinely sustained — his HIV RNA never became detectable during that same illness, a fact the team reads as further evidence the dip was a transient immunologic response to the flu itself rather than any loosening of his underlying viral control.
HIV clinic, prophylaxis review visit
His two most recent CD4 checks are both comfortably above 200 — 298 and 312. Current guidelines support stopping PCP prophylaxis — secondary as well as primary, on the same threshold — once CD4 is sustained above 200 for three months, and that's where his numbers sit today. I'd stop the TMP-SMX.
I want to look at the same numbers a little more literally before I agree.
Four months ago his CD4 was 178 — below the threshold, not just close to it. If 'sustained above 200' means an unbroken interval, that dip resets the clock, and he's only been consistently above threshold for a little over a month, not three. I'm not saying his PCP risk today is meaningfully elevated — I'm saying the guideline's own criterion, read literally, isn't yet met. And this isn't a first infection we'd be gambling with — he was hospitalized a week the one time he got PCP. A second episode in someone we already know is susceptible carries more weight than a first one would in a treatment-naive patient, which is exactly why I want the count right rather than approximately right.
The dip has a documented, plausible explanation — it coincided exactly with a confirmed influenza infection, which is a well-recognized cause of transient CD4 suppression independent of any change in his actual immune recovery on ART. A guideline threshold is a proxy for genuine sustained recovery, not a substitute for judgment about what caused a single deviation from it. I'd also point to the number this room keeps skipping past: his HIV RNA stayed undetectable straight through that same illness. A genuine loosening of his virologic control almost always shows up there before it shows up in a CD4 count — flu suppresses lymphocyte counts directly, it doesn't touch viral suppression on a working regimen. If his RNA had blipped alongside the CD4 dip, I'd share the concern about a real interruption. It didn't. Given the explained dip, the stable RNA underneath it, and an otherwise clean upward trajectory, I'd treat his recovery as genuinely sustained and support stopping prophylaxis — with the second-episode stakes noted, but not changing the read of what actually happened four months ago.
Agreed to discontinue PCP prophylaxis today, with the infectious disease physician's literal-reading concern noted in the chart rather than overridden silently — if his CD4 shows any unexplained decline at the 3-month recheck, prophylaxis restarts without requiring a new discussion. He was told directly to report any respiratory symptoms promptly given his history of PCP at diagnosis.