en Health Health Original Research Original Research <strong>Background: </strong>: In 2017, American College of Cardiology (ACC) and the American Heart Association (AHA) presented a new guideline for assessing blood pressure in adults. This study aimed to assess the prevalence of hypertension in Iranian adults based on ACC/AHA 2017 guideline.<br> &nbsp;&nbsp; <strong>Methods:</strong> Data from 9801 Iranian adults (59.2% women) aged between 20&ndash;69 years were obtained from the sixth round of National Surveillance of Risk Factors of Non-Communicable Diseases (SuRFNCD) performed in 2011. Blood pressure was classified as normal, elevated blood pressure, and stage 1 and 2 hypertension using a weighted analysis and 2017 ACC/AHA guidelines. Data were presented as prevalence and 95% confidence interval (95% CI). All analyses were performed in Stata/SE 14.0.<br> &nbsp;&nbsp; <strong>Results: </strong>Overall prevalence of hypertension in Iranian men was 52.0%. Also, 32.9% (95% CI: 29.9-36.0) and 19.1% (95% CI: 16.9-21.6) of men had stage 1 and 2 hypertension, respectively. In addition, 44.3% of women had hypertension, of whom 26.3% (95% CI: 24.5 - 28.2) had stage 1 and 18.0% (95% CI: 16.1-20.1) stage 2 hypertension. Furthermore, 16.5% (95% CI: 14.4-18.9) and 9.6% (95% CI: 7.86-11.7) of men and women had elevated blood pressure, respectively.<br> &nbsp;&nbsp; <strong>Conclusion:</strong> The findings of this study indicated that adopting the 2017 ACC/AHA guidelines showed a higher prevalence of adult hypertension (48.2%) in Iran. In this study, the prevalence of hypertension in men was higher than in women, which was steadily increased by age in older adults in both sexes. Adult hypertension, ACC/AHA guidelines, Prevalence, Iran, High blood pressure 151 157 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-3625-1&slc_lang=en&sid=1 Mostafa Hosseini mhossein110@yahoo.com 200319475328460062788 200319475328460062788 No Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Mehdi Yaseri m.yaseri@gmail.com 200319475328460062789 200319475328460062789 No Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Hadi Asady asadyhadi60@gmail.com 200319475328460062790 200319475328460062790 No Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, & Social Determinants of Health Research Center, Saveh University of Medical Sciences, Saveh, Iran Ahmed Eleojo Musa musahmed@yahoo.com 200319475328460062791 200319475328460062791 No Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, International Campus, Tehran, Iran Jalil Koohpayehzadeh jkoohpayehzadeh@tums.ac.ir 200319475328460062792 200319475328460062792 No Department of Community Medicine, Iran University of Medical Sciences, Tehran, Iran Ali Rafei rafeicdc@yahoo.com 200319475328460062793 200319475328460062793 No Center for Disease Control, Ministry of Health and Medical Education, Tehran, Iran Koorosh Etemad Etemadk@crc.mus.ac.ir 200319475328460062794 200319475328460062794 No Center for Disease Control, Ministry of Health and Medical Education & Department of Epidemiology, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran Mohammad Mehdi Gouya Gouyamm@alumni.tums.ac.ir 200319475328460062795 200319475328460062795 No Center for Disease Control, Ministry of Health and Medical Education, Tehran, Iran Fereshteh Asgari asgarifcdc@yahoo.com 200319475328460062796 200319475328460062796 No Center for Disease Control, Ministry of Health and Medical Education, Tehran, Iran Mahmoud Yousefifard yousefifard.m@iums.ac.ir 200319475328460062797 200319475328460062797 Yes Physiology Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran