Authors: Vittal BG, Bhaskara K, Naveenkumar GH
Background: Uric acid a metabolic end product of purine degradation is implicated in gout as aetiology. Its increased levels have also been associated with hypertension, cardiovascular morbidity and mortality. Few studies have been conducted, especially in India to elucidate association of uric acid with prehypertension. Aims: This study intends to assess the association of serum uric acid levels with blood pressure in normotensive, prehypertensive and hypertensive population. It also intends to check whether there is an incremental rise of serum uric acid with increasing blood pressure. Material and methods: Two hundred outpatients who met inclusion and exclusion criteria and consented formed study population. Blood pressure of each participant was measured followed by venipuncture to collect venous blood for measurement of serum uric acid. Participants were categorised into 4 groups as Normal, Prehypertension, Hypertension –Stage 1, Hypertension Stage -2 as per Joint National Committee 7 classification. Data was analysed to know levels of serum uric acid among the four categories and to verify association of uric acid with blood pressure. Results and Conclusions: Stepwise increase in serum uric acid levels was observed along with increasing blood pressure. Strong positive linear correlation was observed between serum uric acid levels and mean blood pressure (Pearson’s correlation coefficient r = 0.74; p< 0.0001). Uric acid was associated (r = 0.442) with blood pressure in prehypertension population. Serum uric acid levels are associated with prehypertension and hypertension and are independent and strong predictors of cardiovascular mortality.
Keywords: Blood pressure, Prehypertension, Uric acid.