Assertion: high blood pressure's blood pressure | /r/CapableOf | fluctuate 40 mmhg
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text: One certainly sees an increased risk of stroke when the systolic blood pressure fluctuates 40 mmHg or more (say between 120 mmHg and 160 mmHg) even when mean [or average] blood pressure is very well controlled," Rothwell tells WebMD in an email interview.