The accuracy of the diagnosis of hypertension increases by obtaining repeated blood pressure values. This can be achieved by obtaining multiple office blood pressure measurements (OBPM) or by home blood pressure measurements (HBPM) or using ambulatory blood pressure measurement (ABPM). A 24-hour ABPM is recommended as the preferred modality to diagnose hypertension by the latest guidelines. In this study, we evaluated the diagnostic accuracy achieved by four short-duration-ABPM (sABPM) protocols, i.e., twohour, four-hour, six-hour, eight-hour compared to standard 24-hour ABPM. Materials and methodsWe performed a prospective diagnostic accuracy study in individuals attending the medicine outpatient department. Participants were >18 years, had systolic BP between 130 and 150 mmHg, and were not previously diagnosed as hypertensive. Initially, two OBPM values were taken, and then the ABPM apparatus was applied for 24 hours, which recorded BP at every 30 minutes while awake and at every 60 minutes while asleep. We used four sABPM values (2-hour, 4-hour, 6-hour, and 8-hour sABPM) and OBPM values as index tests, with awake ABPM cut-off of greater than or equal to 135/85 as the definition of hypertension. Analyses were conducted using the R Statistical language (version 4.0.3; R Core Team, 2020) on macOS Catalina 10.15.6. Result Based on the 24-hour ABPM based reference standard definition, 76 (48.7%) individuals out of 156 were classified as hypertensive. The positive predictive value (PPV) of sABPM at two-hour, four-hour, six-hour, and eight-hour above the cut-off of 135/85 was 80.0%, 83.8%, 93.4%, and 94.8%, respectively. PPV increased from 83.8% to 93.4%, and the positive likelihood ratio (LR+) increased from 5.4 to 15.0 with an increase in the sABPM duration from four to six hours. ConclusionWe conclude that short-duration ABPM for six hours has a good diagnostic accuracy amongst hospital attendees. It can act as an intermediary approach between multiple OBPM and standard 24-hour ABPM in this population.

Background Hypertension (HTN) is a key risk-factor for cardiovascular diseases (CVDs). Blood-pressure (BP) categorizations between systolic blood pressure (SBP) of 120 and 140 remain debatable. In the current study we aim to evaluate if individuals with a baseline SBP between 130-140 mm Hg (hypertension as per AHA 2017 guidelines) have a significantly higher proportion of incident hypertension on follow-up, as compared to those with SBP between 120-130 mm Hg. Methods Secondary data analysis was performed in a community-based cohort, instituted, and followed since 2017. Participants were aged ≥30 years, residents of urban slums in Bhopal. BP was measured at or near home by Community Health Workers (CHWs). Two-year follow up was completed in 2019. We excluded participants who were on BP reduction therapy, had fewer than two out-of-office BP measurements and who could not be followed. Eligible participants were re-classified based on baseline BP in four categories: Normal (Category-A), Elevated-BP (Category-B), Variable-BP (Category-C) and reclassified HTN based on AHA-2017 (Category-D). Proportion of individuals who developed incident hypertension on follow up was primary outcome. Result Out of 2649 records, 768 (28.9%), 647 (24.4%), 586 (22.1%), 648 (24.4%) belonged to Categories A, B, C and D respectively. Incident HTN with cut-off of 140/90 mm Hg was, 1.6%, 2.6%, 6.7%, 12% in categories A, B, C and D respectively. Incidence of incident hypertension in individuals with a baseline SBP between 130-140 mm Hg (Category D) was significantly higher as compared to those with SBP between 120-130 mm Hg (Category B). Conclusion We conclude that biological basis for AHA-2017 definition of hypertension is relatively robust also for low income and resource-limited settings. Evidence from our longitudinal study will be useful for policy makers for harmonizing national guidelines with AHA-2017. Keywords- hypertension, elevated blood pressure, community health worker, cardiovascular diseases

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