High blood pressure may be one of the top killers in the country, but you’d never know it by the way we’re behaving, according to scientists. Researchers across the US created a special registry to find out what happens to patients with acute, severe hypertension — those with blood pressure readings above 160/110 — when they come to an emergency department or critical care setting for treatment. They found that although 90 percent of them already had a diagnosis of high blood pressure, about a quarter of them were not taking the medicines they were supposed to.