Essential Hypertension
Hypertension (high blood pressure) is defined as a sustained elevation in arterial pressure. It is largely asymptomatic ("the silent killer"), meaning the only way to diagnose and monitor it is through consistent, accurate mechanical measurement.
Understanding the Numbers
A blood pressure reading consists of two numbers measured in millimeters of mercury (mm Hg):
- Systolic (The top number): The pressure in your arteries when your heart beats and pumps blood.
- Diastolic (The bottom number): The pressure in your arteries when your heart rests between beats.
ACC/AHA Blood Pressure Categories
| Category | Systolic (Top) | Diastolic (Bottom) | |
|---|---|---|---|
| Normal | Less than 120 | and | Less than 80 |
| Elevated | 120 – 129 | and | Less than 80 |
| Stage 1 Hypertension | 130 – 139 | or | 80 – 89 |
| Stage 2 Hypertension | 140 or higher | or | 90 or higher |
| Hypertensive Crisis | Higher than 180 | and/or | Higher than 120 |
Why It Matters
Sustained high blood pressure physically damages the endothelial lining of your arteries over years. This structural damage makes the arteries rigid and prone to plaque buildup (atherosclerosis), dramatically increasing the risk of:
- Ischemic Stroke
- Myocardial Infarction (Heart Attack)
- Chronic Kidney Disease
- Heart Failure
The First-Line Interventions
Before prescribing medication, physicians usually mandate a trial of lifestyle modifications, provided the patient is not in immediate risk (Stage 1 without other risk factors). The data shows significant mm Hg reductions from:
- Weight Loss: Approximately 1 mm Hg reduction per 1kg of weight lost.
- DASH Diet: Dietary Approaches to Stop Hypertension (rich in fruits, vegetables, low-fat dairy).
- Sodium Reduction: Aiming for < 1,500 mg/day.
- Physical Activity: 90-150 minutes of aerobic exercise per week.
Track Your Numbers
"White coat hypertension" (elevated BP only at the doctor's office) affects up to 20% of patients. Home monitoring is the gold standard for diagnosis.
Open Blood Pressure Tool