Systolic pressure is the pressure in the arteries as the cardiac muscle contracts, it is measured in mm Hg. When a blood pressure reading is taken the systolic pressure is seen as the numerator and the diastolic pressure is the denominator.  A systolic pressure reading of below 120 mm Hg is within the normal range, where as if the reading is 120 - 139 mm Hg the patient is said to have Prehypertension. Stage 1 hypertension patients have a systolic pressure of 140 - 159 mm Hg and stage 2 hypertension patients have a systolic pressure above 160 mm Hg.
- ↑ Linus Pauling Institue (2009) Dietary and Lifestyle Strategies to Control Blood Pressure, available at: http://lpi.oregonstate.edu/ss09/bloodpressure.htmlfckLRlast accessed 25/11/14
- ↑ American Heart Association (2014) Understanding Blood Pressure Readings, available at: http://www.heart.org/HEARTORG/Conditions/HighBloodPressure/AboutHighBloodPressure/Understanding-Blood-Pressure-Readings_UCM_301764_Article.jspfckLRLast accessed: 25/11/14
- ↑ National Heart, Lung and Blood Institute (2012) What is High Blood Pressure? Available at: http://www.nhlbi.nih.gov/health/health-topics/topics/hbp/fckLRLast accessed: 25/11/14