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.
Causes for Hypertension. Over 90% of the time, an identifiable cause for hypertension cannot be found. This is known as primary or essential hypertension. The term essential arose from a belief long ago that an increased pressure was essential to maintain blood perfusion through an abnormal arterial system.