Intensive lowering of blood pressure to a systolic target less than 120 mm Hg reduced cardiovascular events among individuals at high risk for cardiovascular disease, compared with standard treatment using a target less than 140 mm Hg in the ESPRIT trial.
a 39% lower cardiovascular mortality, and 21% lower all-cause mortality than the standard treatment targeting a systolic pressure below 140 mm Hg,” reported lead investigator, Jing Li, MD, PhD, director of the department of preventive medicine at the National Center for Cardiovascular Diseases in Beijing.
The trial included patients with diabetes and those with a history of stroke, two important groups that were excluded in the previous SPRINT trial of intensive BP lowering. Results suggested that the benefit of intensive BP lowering extends to these groups.
The results translate into the prevention of 14 major vascular events and 8 deaths for every 1,000 individuals are treated for 3 years to a target systolic pressure less than 120 mm Hg rather than less than 140 mm Hg, at the cost of an additional three patients experiencing the serious adverse event of syncope, Dr. Li said.
“Our study generates new evidence about benefit and safety of treatment targeting systolic blood pressure below 120 mm Hg among a diverse Asian population, which is generally consistent with those from other ethnicities. Implementing this intensive treatment strategy for high-risk adults has the potential to save more lives and reduce the public health burden of heart disease worldwide,” she concluded.
Dr. Li presented the ESPRIT trial at the annual scientific sessions of the American Heart Association.
The ESPRIT trial included 11,255 Chinese adults (average age, 64 years; 41% women) who had a baseline systolic BP measurement of 130-180 mm Hg (average was 147/83 mm Hg) and either established cardiovascular disease or at least two major risk factors for cardiovascular disease. Of those enrolled, 39% had diabetes, and 27% had a history of stroke.
They were randomly assigned to receive intensive BP treatment, with a systolic BP target less than 120 mm Hg, or standard treatment, with a target measurement less than 140 mm Hg, over a 3-year period. After 1 year, systolic pressure was lowered to 135.6 mm Hg in the standard care group and to 120.3 mm Hg in the intensive treatment group, with values remaining at around the same level for the remainder of the follow-up.
The primary outcome was a composite of myocardial infarction, coronary or noncoronary revascularization, hospitalization/ED visit for heart failure, stroke, or cardiovascular death.
After 3.4 years of follow-up, 624 primary outcome events had occurred in the standard arm (3.6%) versus 547 events in intensive arm (3.2%), a reduction of 12% (hazard ratio, 0.88; 95% confidence interval, 0.78-0.99). This gives a number needed to treat to prevent one event of 74.
Cardiovascular death occurred in 0.5% of the standard group versus 0.3% of the intensive group (HR 0.61; 95% CI, 0.44-0.84); and all-cause death occurred in 1.1% of the standard group versus 0.9% of the intensive group (HR, 0.79; 95% CI, 0.64-0.97).
The individual endpoints of MI, stroke, and heart failure showed positive trends to a reduction with intensive BP lowering, but these did not reach statistical significance.
In terms of serious adverse events, syncope was increased in the intensive group (0.4% vs 0.1%), but there were no significant differences in hypotension, electrolyte abnormality, falls resulting in an injury, acute kidney injury, or renal failure.