Research: GADARIA-RATHOD and COLLEAGUES,

Listed in Issue 245

Abstract

GADARIA-RATHOD and COLLEAGUES,  (1)1 Department of Ophthalmology, Mount Sinai School of Medicine , Mount Sinai Medical Center, New York, New York conducted red blood cell fatty acid analysis in dry eye disease trials to determine compliance with omega-3 supplements.

Background

The authors set out to evaluate pill counts and red blood cell (RBC) membrane fatty acid profiles as measures of compliance with oral omega3 polyunsaturated fatty acids (ω3 PUFAs) and to compare the two techniques.

Methodology

Sixteen dry eye disease subjects were given oral ω3 PUFA or placebo for 3 months. Compliance was measured by pill counts and blood tests at baseline and 3 months. The Wilcoxon signed-rank tests and rank-sum tests were used to compare changes from baseline and the difference between the two groups; Spearman correlation coefficients were used to assess the relationship of pill counts to changes in blood fatty acids - FAs.

Results

Pill counts for the ω3 (n=7) and placebo (n=9) groups showed a mean consumption of 4.39 and 4.76 pills per day, respectively. In the ω3 group, the median change from baseline was +1.46% for eicosapentaenoic acid (EPA) (P=0.03), +1.49% for docosahexaenoic acid (DHA) (P=0.08), and -1.91% for arachidonic acids (AA) (P=0.02). In the placebo group, median changes in all measured FAs were small and not statistically significant. The difference in change in FA levels between the two groups was significantly greater for EPA (P=0.01) and AA (P=0.04). The correlations between pill counts and changes in EPA (r=0.36, P=0.43) and DHA (r=0.17, P=0.70) were not strong.

Conclusion

RBC FA analysis can be used to measure compliance in the active group and also monitor the placebo group for nonstudy ω3 intake. Low correlation of pill counts with blood levels suggests that pill counts alone may be inaccurate and should be replaced or supplemented with objective measures.

References

Gadaria-Rathod N(1), Dentone PG, Peskin E, Maguire MG, Moser A, Asbell PA. Red blood cell fatty acid analysis for determining compliance with omega3 supplements in dry eye disease trials. J Ocul Pharmacol Ther. 29(9):837-41. Nov 2013. doi: 10.1089/jop.2013.0043. Epub Aug 24 2013.

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