The Phase Gate Review methodology improves project effectiveness by reviewing all stages of the project from the initial selection process through the entire process of development to the final stages of closure.
Idiopathic hypertension redirects here. For the condition of raised blood pressure within the skull, see Idiopathic intracranial hypertension. Essential hypertension (also called primary hypertension or idiopathic hypertension) is the form of hypertension that by definition has no identifiable cause.
Hypertension is classified as either primary (essential) hypertension or secondary hypertension. About 90â95% of cases are categorized as primary hypertension, defined as high blood pressure with no obvious underlying cause.ormal blood pressure at rest is within the range of 100â140 millimeters mercury (mmHg) systolic and 60â90 mmHg diastolic. Hypertension is present if the blood pressure is persistently at or above 140/90 mmHg for most adults; different numbers apply to children.