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    Amino-terminal-pro-B-type natriuretic peptide levels and low diastolic blood pressure: Potential relevance to the diastolic J-curve

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    Authors
    Campbell, D.
    McGrady, M.
    Prior, D.
    Coller, J.
    Boffa, U.
    Shiel, L.
    Liew, D.
    Wolfe, R.
    Stewart, S.
    Reid, Christopher
    Krum, H.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Campbell, D. and McGrady, M. and Prior, D. and Coller, J. and Boffa, U. and Shiel, L. and Liew, D. et al. 2014. Amino-terminal-pro-B-type natriuretic peptide levels and low diastolic blood pressure: Potential relevance to the diastolic J-curve. Journal of Hypertension. 32 (11): pp. 2158-2165.
    Source Title
    Journal of Hypertension
    DOI
    10.1097/HJH.0000000000000320
    ISSN
    0263-6352
    School
    Department of Health Policy and Management
    URI
    http://hdl.handle.net/20.500.11937/32540
    Collection
    • Curtin Research Publications
    Abstract

    Background: There is debate whether the J-curve relationship between cardiac event risk and DBP is because of inherent cardiac risk or is a consequence of blood pressure (BP) lowering therapy. Methods: We examined the association between the cardiovascular risk marker amino-terminal-pro-B-type natriuretic peptide (NT-proBNP) and DBP in 1781 women and 2211 men aged at least 60 years with one or more cardiovascular risk factors; exclusion criteria were known heart failure or cardiac abnormality on a cardiac imaging study. Results: The lowest median serum NT-proBNP levels were for DBP 85-89mmHg for both women and men. DBP less than 70mmHg in women and less than 80mmHg in men was associated with higher NT-proBNP levels than the levels at DBP 85-89 mmHg, and this relationship was present for those with SBP equal to or less than 140 and SBP greater than 140 mmHg. In conditional logistic regression models, the association of elevated NT-proBNP levels with low DBP in women was no longer statistically significant after adjustment for age, ischaemic heart disease (IHD), pulse rate, atrial fibrillation, haemoglobin and glomerular filtration rate, whereas the association in men was no longer statistically significant after adjustment for age and IHD. By contrast, the association between elevated NT-proBNP levels and low DBP remained statistically significant after adjustment for the number of antihypertensive drug classes alone or together with all antihypertensive drugs, including ß-blocker therapy. Conclusion: There was a J-curve relationship between the cardiovascular risk marker NT-proBNP and DBP that was explained by the clinical variables and not by the BPlowering therapy.

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