A few years ago I wrote about the problem with vitamin C in sepsis.
It’s not that vitamin C is harmful (it probably isn’t) or that it’s ineffective (it almost certainly is) but that embracing pseudoscience undermines evidence based practice.
Most have given up on the “metabolic cure for sepsis” (with notable exceptions).
Why are “simple, cheap” therapies so alluring? and what can we learn about COVID?
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These pseudoscientific “miracle cures” exploit our desire to help our patients and appeal to several common cognitive biases and delusions.
🚩 Let’s run through some of the red flags of miracle cures:
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1.FAMILIARITY HEURISTIC - surely a drug that you’ve heard of (& perhaps used) can’t be harmful?
This ignores the fact that disease context determines risk. IVM or HCQ may be benign in healthy outpatients but not necessarily in critically ill inpatients on other therapies.
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2. NATURAL DELUSION - the idea that “natural” things cannot be harmful. Most medications are “natural” (they come from plants or animals), but even vitamins can be harmful in excess (hypervitaminoses).
3. PHARMA PARANOIA - how can we trust meds made by companies with profit motives?
Never mind that the putative “cures” (IVM, HCQ, vitamins, etc) are also made by pharma & new drug approvals (NDA) have far greater scrutiny by FDA than off-label use. usatoday.com/story/money/20…
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There’s an obvious reason why “miracle cures” are always repurposed meds or “natural” supplements: “Off-label” use enables them to bypass virtually all regulatory approval.
4. KITCHEN SINK therapies - "miracle cures” are often combination therapies. This makes the “bundle” harder to disprove, especially as it "evolves" & meds are added. Sometimes combos include actual effective therapies, such as corticosteroids, to give them face validity.
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Look at this kitchen sink “protocol" by FLCCC: 14 meds. Steroids up front (@ too high a dose), then crazy stuff (looking 👀 at you ivermectin), then the really crazy stuff (🧐Anti-androgen therapy? PLEX?)
Nonsense, but professional appearing; easy to see why it fools people. 8/
CONFLATION of preclinical & clinical evidence. With millions of papers on Pubmed, there is a real risk of apophenia - drawing spurious connections between unrelated things.
Miracle cure proponents often cherry-pick in vitro data as unassailable proof of clinical efficacy. 9/
“Metabolic cure” proponents often conflated in vitro metabolic studies showing that prolonged vitamin C deficiency is bad with observational studies showing that serum vitamin C levels transiently decrease in sepsis.
This is a nice hypothesis but hardly “proof" 10/
Superficially this looks compelling but remember that deficiency of literally ANY vitamin causes adverse effects (that’s the definition of a vitamin btw), and there are thousands of serum compounds perturbed in sepsis.
We could cherry pick dozens of examples just like this. 11/
6. CONSPIRACIES - believers invoke a vast, ill-defined conspiracy between pharma, governments, & complicit doctors to “suppress" cures. This allows believers to ignore conflicting evidence & guidelines.
The fact that domain experts disagree is further proof of the conspiracy. 12/
7. EMINENCE BASED MEDICINE - in many cases the doctors who promulgate these cures are just as famous as the therapy itself, in some cases getting widespread attention by media and politicians.
These attention seeking behaviors are a big red flag. 13/
So what can we do about "miracle cures"? 1. Remember that “totally safe” therapies don't exist. Even "safe" drugs may not be benign when combined together in critically illness 2. Recognize the 🚩 signs of “miracle cures" (above) 3. Point out misinformation when you see it
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#INSPIRATION RCT comparing intermediate vs standard dose DVT prophylaxis, just published @jama:
-no benefit to additional anticoag in ICU patients w/ #COVID19:no reduction in mortality, MV, LOS or any 2° endpoint
-time to rethink COVID #anticoagulation? 1/ bit.ly/3vCluqK
INSPIRATION was a 10 site open-label RCT in 🇮🇷 comparing intermediate vs standard dose prophylaxis in ICU patients with PCR-confirmed #COVID19.
LMWH was the primary intervention (~40 mg vs 1mg/kg daily), dosed appropriately for weight; UFH was used if the GFR was too low.
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Overall the groups were balanced (total n=562) & were fairly representative of US ICU cohorts with COVID19.
The use of HFNC was very low (~3%) compared to in the US, which may reflect different practice patterns/availability.
Pre-print of the @remap_cap RCT of #anticoagulation for ICU patients w/ #COVID19 adds details but confirms what we learned from the press release:
- no improvement in survival or organ failure w/ therapeutic (TA) vs prophylactic anticoagulation (PA)
- medrxiv.org/content/10.110… 1/
This study is the amalgam of 3 large platform RCTs of TA in COVID19: @remap_cap@ACTIV4a & ATTACC.
Each trial was administered separately but as much as possible they harmonized the design so the results could be analyzed together. (a pragmatic way to enroll more pts faster) 2/
There were some differences:
-REMAP enrolled suspected & confirmed infxn; the others only enrolled confirmed
-choice of anticoagulant varied
-most importantly, the definition of prophylaxis: ~1/2 the sites used standard low-dose heparin, the remainder used “intermediate dose” 3/
Following @remap_cap & #RECOVERY#Tocilizumab results, @NIHCOVIDTxGuide has updated guidelines:
-#Toci + #Dexamethasone now recommended for all ICU pts on IMV, NIPPV, or HFNC
-Toci + Dex recommended for non-ICU pts w/ rapidly increasing O2 needs & elevated inflammatory markers 1/
There are some caveats:
-Toci must be combined with dexamethasone (not given alone; ? harm signal)
-It should be given early (w/i 3 days)
-Toci should NOT be given to people who are already immunosuppressed or who have “an uncontrolled” infxn (e.g. getting worse despite Abx) 3/
🚨Exciting results from the #RECOVERY trial #preprint of #Tocalizumab (Toci) in hospitalized people w/ #COVID19
-reduced 28-day mortality (29 vs 33%; NNT)
-decreased likelihood of requiring MV (33% vs 38%)
-shorter hospital stay (median 20 vs >28 days) medrxiv.org/content/10.110… 1/
They randomized 4116 pts to weight-based Toci vs usual care (UC):
-groups were balanced: mostly male (>65%), older (>60 yo), & w/ comorbidities (>55%)
-most patients (82%) also received dexamethasone
-they received Toci early in hospitalization but were 7-14 days after onset 2/
Notably, only 83% of patients in the Toci group actually received Toci (plus 2.6% randomized to the UC group got Toci); this would decrease the effect size and bias the towards null.
This means their ITT analysis is probably *underestimating* the true effect size somewhat.
It kinda irks me when someone describes a vital sign or lab value as “incompatible with life.”
Here’s a @tweetorial all about the extremes of physiology.
Case #1:
A 10 yo ____ presents with the following vital signs.
T 109F RR 30 HR 300 BP 142/116
Fill in the blank
Answer: 🐓
A chicken's "normal" Temp is 103-110F (w/ HR 220-360) & they live up to 11 yrs.
The Hummingbird would be quite bradycardia (“normal" HR 800-1200 when active)
The Desert ant (Cataglyphis bicolor) has a higher temp (up to 122F!) but doesn't live 10 yrs or have that BP
Case #2:
An *arterial* blood gas is obtained from a ___ showing
pH 7.37 / PCO2 50 / PaO2 20 / HCO3 26
(yup it really is arterial)
First, Abx prescribing was much higher earlier in the pandemic (January 86% vs April 63%) and higher in China (76%) compared to the US (65%) & Europe (63%).
This suggests that overprescribing may be less of an issue currently and in the US.
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Second, only 5 studies (out of 154) reported the Abx duration. We don’t know if Abx was quickly de-escalated (appropriate) vs continued despite (-)cultures (inappropriate).
IMO It’s not wrong to start Abx in sick COVID pts so long as you promptly d/c when cultures are (-)
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