- Presence of hypertension: Diastolic blood pressure above the 95% for age in children (Appendix 2) and > 160 mmHg systolic or >100 mmHg diastolic in adults on at least 2 of 3 measurements with an appropriate-size cuff who are unable to achieve blood pressure control with optimal anti-hypertensive therapy. Patients who are treated with antihypertensive medications with good response are eligible.