Blood pressure is made up of two numbers: systolic and diastolic.
Systolic blood pressure is the pressure when the ventricles pump blood out of the heart. Diastolic blood pressure is the pressure between heartbeats when the heart is filling with blood.
A recent study from Kaiser Permanente found that both numbers in a blood pressure reading can help predict the risk of heart attack or stroke.
The finding runs counter to previous results that high systolic blood pressure is more likely than diastolic pressure to result in bad health outcomes.
Systolic pressure is the upper number in a blood pressure reading. It measures how hard the heart pumps blood into arteries.
Diastolic pressure is the bottom number. It indicates the pressure on the arteries when the heart rests between beats.
Decades of research have shown that high systolic blood pressure is more likely to result in bad health outcomes, such as heart disease and stroke.
As a result, doctors focus on the upper number, with some experts arguing that the diastolic number might reasonably be ignored.
The team examined more than 36 million blood pressure readings taken during outpatient visits between 2007 and 2016, from 1.3 million adult Kaiser Permanente members in Northern California.
They found that systolic pressure has a greater impact.
But both systolic and diastolic pressures could strongly affect the risk of heart attack or stroke, regardless of the definition used for high blood pressure (140/90 mm Hg versus 130/80 mm Hg).
The finding that systolic and diastolic high blood pressures have similar impacts on risk at the lower threshold of 130/80 provides independent support for recent changes in guidelines.
The results suggest that tighter blood pressure control in higher-risk patients with high blood pressure is necessary for reducing heart disease risk.
The team says the systolic and diastolic pressures are both important and that in people who are generally healthy, lower blood pressure numbers are better.
The study was published in the New England Journal of Medicine and conducted by Alexander C. Flint et al.
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