- Poorly controlled hypertension (defined as systolic blood pressure [BP] >= 140 and/or diastolic BP >= 90) measured on more than one occasion and not responsive to antihypertensives; Note: Initiation or adjustment of antihypertensive medication(s) is permitted prior to study entry and during study if required; BP must be re-assessed on two occasions separated by a minimum of 1 hour; on each of these occasions, the mean systolic (S)BP/diastolic (D)BP values (of 3 readings) must be < 140/90 mmHg in order for a subject to be eligible for the study