Abstract 149: Impact of Baseline 10-year Cardiovascular Risk on Benefit and Harm of Intensive Treatment in SPRINT
We investigated the impact of baseline CV risk on outcomes in SPRINT. Using the ACC/AHA CVD risk algorithm, we stratified the SPRINT population into quartiles of baseline 10-year CV risk. Within each quartile, Cox proportional hazards models were used to examine the effect of intensive treatment vs. standard of care on the SPRINT CV outcomes, all-cause mortality and serious adverse events (SAEs). Number needed to treat (NNT) and number needed to harm (NNH) were calculated for each quartile. There were 9,323 participants with available baseline ACC/AHA 10-year risk scores. In each quartile of risk, the hazard ratio (HR) favored intensive treatment. For CV outcomes, NNT decreased from 91 in the 1 st quartile to 38 in the 4 th quartile. For all-cause mortality, NNT decreased from 333 in the 1 st quartile to 45 in the 4 th quartile. Although incidence of all SAEs increased with each quartile in both treatment groups (p for trend <0.0001), there was no difference in incidence of SAEs between the treatment groups in each quartile. However, SAEs classified as hypotension were more frequent in the 4 th quartile for the intensive treatment group (incremental increase 1.8%, NNH = 55) and SAEs classified as acute kidney injury or acute renal failure were significantly more frequent in the 2 nd , 3 rd and 4 th quartiles for the intensively treated group (incremental increase 1.7%, 2.4% and 2.1%; NNH 59, 42 and 48, respectively). Therefore, those with greatest baseline CVD risk got the most benefit from intensive BP treatment but were at greater risk for hypotension and renal injury. This analysis may help providers and patients make decisions regarding the intensity of BP treatment to prevent death and CV events.