Association of blood pressure with cognitive function at midlife: a Mendelian randomization study.

Abstract:

BACKGROUND:Whether high blood pressure has a causal effect on cognitive function as early as middle age is unclear. We investigated whether high blood pressure (BP) causally impairs cognitive function at midlife using Mendelian Randomization (MR). METHODS:We applied a two-sample MR approach to investigate the causal relationship between BP and midlife cognitive performance measured by the Digit Symbol Substitution Test (DSST), Rey Auditory Verbal Learning Test (RAVLT), and Stroop Interference test. We used a total of 109 genetic polymorphisms with established associations with BP as instrumental variables and estimated gene-cognitive function association in 1369 middle-aged adults (Mean age (SD): 50.8 (3.3), 54.0% women) from the CARDIA study. RESULTS:A 10 mmHg increment in genetically-predicted systolic, diastolic, or pulse pressure was associated with a 4.9 to 7.7-point lower DSST score (P = 0.002, SBP; P = 0.005, DBP and P = 0.008, PP), while a 10 mmHg increment in genetically-predicted SBP was associated with a 0.7 point lower RAVLT and a 2.3 point higher Stroop (P = 0.046 and 0.011, respectively). CONCLUSIONS:This MR analysis shows that high BP, especially SBP, is causally associated with poorer processing speed, verbal memory, and executive function during midlife. These findings emphasize the need for further investigation of the role and mechanisms of BP dysregulation on cognitive health in middle age and perhaps, more broadly, across the lifespan.

journal_name

BMC Med Genomics

journal_title

BMC medical genomics

authors

Sun D,Thomas EA,Launer LJ,Sidney S,Yaffe K,Fornage M

doi

10.1186/s12920-020-00769-y

subject

Has Abstract

pub_date

2020-08-26 00:00:00

pages

121

issue

1

issn

1755-8794

pii

10.1186/s12920-020-00769-y

journal_volume

13

pub_type

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