- Uncontrolled (lasting >24 hrs on antihypertensive medication) hypertension as defined by age-appropriate criteria. Hypertension is defined as average systolic blood pressure and/or diastolic blood pressure that is 95th percentile for gender, age, and height on 3 occasions93. 95th percentiles for gender, age and height are provided in Appendix A. For patients ≥18 years of age, hypertension is defined as systolic blood pressure >150mmHg and/or diastolic blood pressure >100mmHg.