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Biochemical Screening for Nonadherence Is Associated With Blood Pressure Reduction and Improvement in Adherence
Pankaj Gupta1, Prashanth Patel1, Branislav Štrauch1
1From the Department of Metabolic Medicine and Chemical Pathology, University Hospitals of Leicester NHS Trust, United Kingdom (P.G., P.P., G.S.G., P.R.S.); Department of Cardiovascular Sciences, University of Leicester, United Kingdom (P.G., P.P., F.Y.L., G.S.G., N.J.S.); National Institute for Health Research Leicester Cardiovascular Biomedical Research Unit, United Kingdom (P.G., P.P., F.Y.L., N.J.S.); Division of Cardiovascular Sciences, Faculty of Biology, Medicine, and Health, University of Manchester, United Kingdom (P.G., A.A., B.K., A.H., M.T.); 3rd Department of Medicine, Department of Endocrinology and Metabolism, Hypertension Centre (B.S., J.W.) and Institute of Forensic Medicine and Toxicology (V.M.), General University Hospital, Charles University, Prague, Czech Republic; University of Leicester, United Kingdom (A.B.); University Hospitals of Leicester NHS Trust, United Kingdom (P.S.T., A.S., H.T.); Department of Health Psychology, University College of London, United Kingdom (R.H.); Division of Medicine, Central Manchester NHS Foundation Trust, Manchester Academic Health Science Centre, United Kingdom (B.K., A.H., M.T.); Institute of Cardiovascular Science, University College London, United Kingdom (B.W.); and National Institute for Health Research, University College London Hospitals Biomedical Research Centre, United Kingdom (B.W.).
Abstract:
We hypothesized that screening for nonadherence to antihypertensive treatment using liquid chromatography-tandem mass spectrometry-based biochemical analysis of urine/serum has therapeutic applications in nonadherent hypertensive patients. A retrospective analysis of hypertensive patients attending specialist tertiary care centers was conducted in 2 European countries (United Kingdom and Czech Republic). Nonadherence to antihypertensive treatment was diagnosed using biochemical analysis of urine (United Kingdom) or serum (Czech Republic). These results were subsequently discussed with each patient, and data on follow-up clinic blood pressure (BP) measurements were collected from clinical files. Of 238 UK patients who underwent biochemical urine analysis, 73 were nonadherent to antihypertensive treatment. Their initial urinary adherence ratio (the ratio of detected to prescribed antihypertensive medications) increased from 0.33 (0-0.67) to 1 (0.67-1) between the first and the last clinic appointments. The observed increase in the urinary adherence ratio in initially nonadherent UK patients was associated with the improved BP control; by the last clinic appointment, systolic and diastolic BPs were ≈19.5 and 7.5 mm Hg lower than at baseline (P=0.001 and 0.009, respectively). These findings were further corroborated in 93 nonadherent hypertensive patients from Czech Republic-their average systolic and diastolic BPs dropped by ≈32.6 and 17.4 mm Hg, respectively (P<0.001), on appointments after the biochemical analysis. Our data show that nonadherent hypertensive patients respond to liquid chromatography-tandem mass spectrometry-based biochemical analysis with improved adherence and significant BP drop. Such repeated biochemical analyses should be considered as a therapeutic approach in nonadherent hypertensive patients.
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