Letters
7 January 2020

Effects of Nutritional Supplements and Dietary Interventions on Cardiovascular Outcomes

Publication: Annals of Internal Medicine
Volume 172, Number 1
TO THE EDITOR:
I applaud Khan and colleagues (1) for taking on the substantial task of performing an umbrella review on nutritional supplements and dietary interventions on cardiovascular outcomes. However, their results for salt reduction for the outcome of all-cause mortality in patients without hypertension deserve additional scrutiny. They cite a Cochrane review (2) as the sole source for this outcome, and the number of events and participants are consistent with that review's analysis for all-cause mortality at longest follow-up.
The RR point estimates in both the Cochrane review and Khan and colleagues' review are 0.90, but the …

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References

1.
Khan SUKhan MURiaz Het al. Effects of nutritional supplements and dietary interventions on cardiovascular outcomes: an umbrella review and evidence map. Ann Intern Med. 2019;171:190-8. [PMID: 31284304].  doi: 10.7326/M19-0341
2.
Adler AJTaylor FMartin Net al. Reduced dietary salt for the prevention of cardiovascular disease. Cochrane Database Syst Rev. 2014:CD009217. [PMID: 25519688]  doi: 10.1002/14651858.CD009217.pub3
3.
Wiksten ARücker GSchwarzer G. Hartung–Knapp method is not always conservative compared with fixed-effect meta-analysis. Stat Med. 2016;35:2503-15. [PMID: 26842654]  doi: 10.1002/sim.6879
4.
Jackson DLaw MRücker Get al. The Hartung–Knapp modification for random-effects meta-analysis: a useful refinement but are there any residual concerns? Stat Med. 2017;36:3923-34. [PMID: 28748567]  doi: 10.1002/sim.7411
5.
Patel CJBurford BIoannidis JP. Assessment of vibration of effects due to model specification can demonstrate the instability of observational associations. J Clin Epidemiol. 2015;68:1046-58. [PMID: 26279400]  doi: 10.1016/j.jclinepi.2015.05.029

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Published In

cover image Annals of Internal Medicine
Annals of Internal Medicine
Volume 172Number 17 January 2020
Pages: 74

History

Published online: 7 January 2020
Published in issue: 7 January 2020

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Martin Mayer, DMSc, MS, PA-C
EBSCO Health and Triad Hospitalist Group, Cone Health, Greensboro, North Carolina (M.M.)
Disclosures: The author has disclosed no conflicts of interest. The form can be viewed at www.acponline.org/authors/icmje/ConflictOfInterestForms.do?msNum=L19-0715.

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Martin Mayer. Effects of Nutritional Supplements and Dietary Interventions on Cardiovascular Outcomes. Ann Intern Med.2020;172:74. [Epub 7 January 2020]. doi:10.7326/L19-0715

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