Introduction

The first measurement of blood pressure originated in 17 33, when sir stephen hales inserted a brass pipe connected to a glass tube into the artery of a horse's leg. Cardi vascular disease remains the leading cause of death among canadians and hyper tension is the most prevalent rist factor for cardy vascular disease in canada. Unlike secondary hyper tension, which is due to underlying causes such as primary aldostronism, fio cormositoma or fibre muscular displasia, there is no known cause for primary hypertension. The patho physiology of primary hyper tension is multifactorial and highly complex with no clear unifying patho physiological process.