Hypertension is the most prevalent cardiovascular disease. Approximately 30 million Americans have been diagnosed with hypertension and over 58 million Americans appear to be affected. Within certain segments of the medical profession, blood pressure thresholds and definitions for hypertension vary. Often, a systolic/ diastolic blood pressure of 140/90 mm Hg is used as a " borderline" to identify the transition from an acceptable blood pressure level into the realms of hypertension. For adults, borderline hypertension has been defined as a systolic blood pressure range between 140 and 160 mmHg and/or a diastolic blood pressure range between 90 and 95 mmHg. Absolute hypertension occurs, once the 160/95 mmHg limits have been exceeded.