LONGTERM CLINICAL AND ECONOMIC OUTCOMES OF INTENSIVE VS STANDARD BLOOD PRESSURE REDUCTION IN NON-DIABETICS AT HIGH CARDIOVASCULAR RISK - EXTRAPOLATIONS FROM THE SPRINT TRIAL
Author(s)
Geisler B1, Acharya B1, Shrestha A2, Pietzsch JB3
1Massachusetts General Hospital/Harvard Medical School, Boston, MA, USA, 2Harvard School of Public Health, Boston, MA, USA, 3Wing Tech Inc., Irvine, CA, USA
OBJECTIVES: Results from the recent SPRINT trial demonstrate lower rates of fatal and non-fatal major cardiovascular events and all-cause mortality in non-diabetics at high cardiovascular risk with intensive versus standard treatment, i.e., less than 120 versus less than 140 mmHg systolic, respectively. However, the long-term outcomes remain unknown. METHODS: A validated state transition model with multivariate risk equations was populated with the baseline characteristics of the SPRINT trial, and cost and health-related quality of life data for the United States. Model projections, based on trial-observed blood pressures, were compared to actual median follow-up trial results for calibration. To assess long-term outcomes, we projected 20-year incidence in myocardial infarctions, strokes, heart failure, and endstage renal disease, and derived relative risks and numbers needed to treat (NNT). Direct medical costs and incremental cost-effectiveness ratio (ICER in $/quality adjusted life year [QALY]), discounted at 3% p.a., were computed for both strategies. RESULTS: The calibrated model outcomes matched the published SPRINT trial results at a median followup of 39 months. Over the 20-year horizon, intense blood pressure control was projected to lead to lower incidences of all studied events; NNTs varied largely between clinical events such as heart failure (696) and cardiovascular and all-cause death (28 and 11, respectively). Life expectancy increased by 2.5 years (85.8 vs. 83.3 years), at similar discounted lifetime costs of about $47K and an ICER of $15,901/QALY. CONCLUSIONS: Our model-based projections suggest intensive blood pressure control in nondiabetics at high cardiovascular risk is associated with significant longterm benefits. Numbers needed to prevent mortality are particularly attractive. Cost savings seem to be consumed by additional life expectancy. Patient-level data analysis via bootstrapping is necessary to quantify the uncertainty.
Conference/Value in Health Info
2017-05, ISPOR 2017, Boston, MA, USA
Value in Health, Vol. 20, No. 5 (May 2017)
Code
PHS71
Topic
Economic Evaluation
Topic Subcategory
Cost-comparison, Effectiveness, Utility, Benefit Analysis
Disease
Cardiovascular Disorders, Multiple Diseases