<qa>  What is the prevalence of RH among adults diagnosed with hypertension?Observational data from the North American National Health and Nutrition Examination Survey NHANES collected in 2003-2008 showed that the prevalence of RH among adults diagnosed with hypertension HTN in this period was 8.9 and among adults on antihypertensive treatment, it was 12.8. Similarly, a large population study in Spain 68,000 patients found that the prevalence of RH was 14.8 among those treated for HTN. Based on these recent studies, it is justifiable to say that the prevalence of RH is about 14. RH is a difficult-to-manage clinical condition due to failure of patients to adhere to treatment, the physicians difficulty to adjust the medication because of genetic factors that hinder the effectiveness of treatment and medical inertia. 