There has been a bit of a back and forth between Dr. Harvey Risch and a French doctor named Vincent Fleury about HDQ.
Anyhow, I will link and cut and paste a couple paragraphs from the exchange:
From Dr. Fleury
A major error is found in the article : Early Outpatient Treatment of Symptomatic, High_Risk Covid-19
Patients that Should be Ramped-Up Immediately as Key to the Pandemic Crisis, by Harvey Risch,
which highlights how the work by Prof. Raoult should be read and considered.
Dr. Harvey Risch (1) advocated the use of hydroxychloroquine and azithromycin for the outpatient
treatment of patients with coronavirus 19 (COVID-19). To support his case, he cited the mortality
calculations from 2 cohorts, one presumably treated by Dr. Zelenko (2) in New York, and the other
treated by Million et al.(3) in France. In his article, Dr. Risch made an error in the calculation of the
estimated mortality among at-risk patients who were treated with a combination of
hydroxychloroquine and azithromycin (and possibly also zinc). Indeed, in order to prove the
supposed superiority of this bitherapy over standard care, Risch posited that based on the observed
number of fatalities among at-risk patients in other studies, one would expect 20% of the 1,466
patients in these 2 cohorts to have died (i.e., approximately 293 patients rather than 7), and
therefore the bitherapy of hydroxychloroquine plus azithromycin is 41 times more efficacious than
standard of care.
After the initial online publication of Dr. Risch’s article, it came to light that 405 of these 1,466
patients were the at-risk patients in Dr Zelenko’s cohort; the remaining 1,061 comprised the whole
sample in the study by Million et al. (3). However, as shown in their Table 2, not all of the 1,061
patients had at least 1 comorbid condition that was a risk factor. Adding the numbers of patients
with each chronic condition reveals that less than 45% of the total treated sample had such a
condition. In addition, because patients often have more than 1 comorbid condition (e.g., obesity
and diabetes or obesity and hypertension), the number of patients who were really at risk is
presumably far lower. 56 patients are even mere asymptomatic contacts of documented cases.
Furthermore, the cohort has a striking demographic distribution: The mean age was 43.6 (standard
deviation, 15.6) years, and the group included teenagers as young as 14 years of age. All of this is to
say that the cohort in the study by Million et al. is in no way comparable to a typical cohort of
hospital patients, who are generally older and in worse health. Moreover, a mean age of 44 years in a
group with no children younger than 14 years of age indicates a very young cohort, much younger
than average. When comparing the cohorts, even patients with similar comorbid conditions do not
have a similar magnitude of the risk.
To be really at risk, you must be older.
Risch then multiplied 1,466 by 20% to get the expected number of deaths: 293. Here is where the
error is manifest. It is indeed true that the fatality rate in hospitalized patients may be somewhere
between 10% and 20%, as cited by Risch (1); however, there is no reason to expect a similar fatality
rate in a cohort such as the one in the study by Million et al., even if it does contain elderly people
and patients at risk. That cohort comprised patients who came on foot to queue up at the hospital,Fr
whereas in other hospitals, patients are generally admitted to the emergency department.
https://watermark.silverchair.com/k...docsO7WbhS5FejViossN-eLLGNmKwjIQa0qwUoc4QnXXQ
And Dr. Harvey Risch's response:
I thank Dr. Fleury (1) for clarifying various details of one of the studies that I discussed in my
review of efficacy and safety of outpatient medication treatment for COVID-19 patients (2). Dr.
Raoult, the senior investigator of that study (3), has been carrying out a medically aggressive
COVID-19 testing and treatment program in Marseille, France. From this distance, it can be
difficult to glean all of the relevant details of the program and I appreciate Dr. Fleury’s more
local information and extended discussion.
In my analysis, I assumed that the patients described by Dr. Raoult as hospital patients were
high-risk. In fact, it seems that Dr. Raoult’s hospital base was used more as a clinic facility
where outpatient testing and treatment were done, and for a fraction of the patients, full hospital
admission occurred.
Thus, Dr. Fleury is indeed correct that the 1,061 patients I discussed were
not all high-risk.
https://watermark.silverchair.com/k...dfrrPdnc6dlx39QQ74kMjIXiJ5Yy1xCxoSyyNZtpwcmwg