Other risk factors for a silent stroke are high blood pressure, heart disease,diabetes and tobacco use.

VOA: special.2009.08.12

These include heart disease, heart attack,stroke,diabetes and high blood pressure.

VOA: special.2009.06.09

It includes heart attack, stroke and high blood pressure.

VOA: special.2009.07.15

Kalllis should have had his 51st soon after, but De Villiers could not hold on to a chest-high stroke by Sulieman Benn.

BBC: West Indies blow their chance against South Africa

After a quiet period Strauss recorded both the England 100, and his 23rd ODI half century, in magnificent fashion when he skipped down the wicket to Shahid Afridi and sent a sweetly timed stroke high over mid-wicket for six, leaving his team needing 188 from 30 overs.

BBC: Century for Andrew Strauss in England win over Pakistan

Mark Turco, chief medical officer of Covidien's vascular business, said there are patients who would be "at very high risk" for stroke, "and the physician may feel uncomfortable" just giving drugs.

WSJ: Are Stroke Drugs Better Than Stents?