Does isolated systolic hypertension occur with ambulatory blood pressure measurement?

Ofice and 24-h ambulatory blood pressure measurements in 815 healthy subjects, who were employees of the Allied Irish Bank [3], were taken as reference values. Data on 318 patients, referred to the Blood Pressure Unit at Beaumont Hospital and diagnosed as having isolated systolic hypertension (clinic systolic pressure equal to or greater than 160 mmHg and diastolic pressure equal to or less than 94mmHg) were analysed. The group was further subdivided into those on and off medication at the time of the blood pressure measurement.