Blood pressure levels below 120 or 140 and above were found to be associated with increased risk of recurrent stroke. Seventy seven percent of Americans treated for a first stroke had blood readings of 140 over 90. Elevated blood pressure is the most important modifiable risk for stroke carrying a lowered risk of stroke as blood pressure decreases. The hypothesis suggested here is that at either extreme of blood pressure individuals are at increased risk of recurrent stroke. Neurology Today 12-1-2011.