Compared to placebo, vitamin D has no benefit for severe asthma attacks,
study finds

Date:
August 25, 2020
Source:
University of Pittsburgh School of Medicine
Summary:
Contrary to earlier observational results, vitamin D supplements do
not prevent severe asthma attacks in at-risk children, according
to the first placebo-controlled clinical trial to test this
relationship.



FULL STORY ========================================================================== Contrary to earlier results, vitamin D supplements do not prevent
severe asthma attacks in at-risk children, according to the first placebo-controlled clinical trial to test this relationship.


========================================================================== These results were published today in JAMA.

"The reason that's important is there are colleagues around this country
and worldwide who are testing vitamin D levels for kids with asthma
and giving them vitamin D," said study lead author Juan C. Celedo'n,
M.D., Dr.P.H., chief of pediatric pulmonary medicine at UPMC Children's Hospital of Pittsburgh. "As a system, it costs a lot of money to run
all these tests and give the supplements. We've shown no benefit for
children with moderately low vitamin D levels." For three years, the Vitamin-D-Kids Asthma (VDKA) Study followed nearly 200 children ages
6 to 16 across seven different U.S. hospital systems. All had at least
one asthma attack during the year before the study began.

Half of the participants were randomized to receive 4,000 IU of vitamin
D per day, and the other half got placebo pills. No one involved in the
study knew which type of pill each participant was getting.

All of the children had vitamin D levels low enough that supplements
should have an effect -- if vitamin D truly is beneficial for reducing
severe asthma attacks -- but the study excluded children with severe
vitamin D deficiency because it would be unethical to withhold it in
those cases.

Compared to placebo, vitamin D did not reduce the number of asthma
attacks participants experienced or their reliance on inhaled steroids.

That's different from what was seen in the past with observational studies
in Costa Rica, the U.S. and Canada, and Puerto Rico, where children with naturally low vitamin D levels seemed to have worse asthma.

"With observational studies, you never know -- is vitamin D causing
asthma to be worse or do kids with worse asthma end up having lower
vitamin D?" said Celedo'n, who also holds the Niels K. Jerne chair of Pediatrics at the University of Pittsburgh School of Medicine.

Even with the rigor of the present study's design, Celedo'n acknowledges
that he can't draw conclusions about whether very low vitamin D levels contribute to asthma attacks, but he argues that those children would
be supplemented either way because of known effects on bone health.

Additional authors on the study include first author Erick Forno, M.D.,
M.P.H., and coauthors Franziska Rosser, M.D., M.P.H., and Yueh-Ying Han,
Ph.D., of UPMC Children's Hospital and Pitt; Leonard Bacharier, M.D., and Joshua Blatter, M.D., M.P.H., of Saint Louis Children's Hospital; Wanda Phipatanakul, M.D., M.S., of Boston Children's Hospital; Theresa Guilbert, M.D., M.S., and Sandy Durrani, M.D., of Cincinnati Children's Hospital;
Michael Cabana, M.D., M.P.H., of UCSF Benioff Children's Hospital;
Kristie Ross, M.D., M.S., of UH Rainbow Babies and Children's Hospital;
Ronina Covar, M.D., of University of Colorado Denver; James Gern, M.D.,
of University of Wisconsin-Madison School of Medicine and Public Health;
and Stephen Wisniewski, Ph.D., of Pitt.

This trial was funded by the National Heart, Lung, and Blood Institute
(grant HL119952). The vitamin D and placebo capsules given to participants
were supplied by Pharmavite, and GlaxoSmithKline provided steroid
inhalers. Neither company had a role in the design, implementation or
data analysis for the study. Celedo'n has received a steroid inhaler
from Merck for another, unrelated study. Conflicts of interest for other authors are disclosed in the study.


========================================================================== Story Source: Materials provided by University_of_Pittsburgh_School_of_Medicine. Note: Content may be edited
for style and length.


========================================================================== Journal Reference:
1. Erick Forno, Leonard B. Bacharier, Wanda Phipatanakul, Theresa W.

Guilbert, Michael D. Cabana, Kristie Ross, Ronina Covar, James
E. Gern, Franziska J. Rosser, Joshua Blatter, Sandy Durrani,
Yueh-Ying Han, Stephen R. Wisniewski, Juan C. Celedo'n. Effect
of Vitamin D3 Supplementation on Severe Asthma Exacerbations in
Children With Asthma and Low Vitamin D Levels. JAMA, 2020; 324
(8): 752 DOI: 10.1001/ jama.2020.12384 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200825113632.htm

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