The heart, a robust engine, circulates blood throughout the body via a complex network of arteries and capillaries, with veins returning the blood to the heart. Blood pressure is the force of this blood pushing against the arterial walls as the heart pumps.
Each heartbeat creates two pressure readings: systolic and diastolic. Systolic pressure occurs when the heart contracts, forcing blood into the arteries, resulting in increased pressure. Diastolic pressure is the pressure in the arteries when the heart relaxes and fills with blood.
Blood pressure is expressed as systolic over diastolic, measured in millimeters of mercury (mmHg), such as 120/80. The systolic reading (top number) reflects the pressure during heart contraction, while the diastolic reading (bottom number) indicates pressure during heart relaxation.
Normal blood pressure varies among individuals. Systolic pressure can range from 90 to 240 mmHg, and diastolic pressure from 40 to 160 mmHg. Fluctuations occur throughout the day, with the lowest pressures typically during sleep or rest. Physical activity, stress, anxiety, and even standing can elevate blood pressure.
Daily blood pressure can fluctuate by 30-40 mmHg for both systolic and diastolic readings, emphasizing the importance of consistent measurement conditions. Ideally, blood pressure should be 120/80 mmHg or lower when at rest.
Consistent readings of 140/90 mmHg or higher may indicate hypertension (high blood pressure). Hypertension forces the heart to work harder, increasing the risk of stroke, heart attack, and kidney problems. Over time, this extra work can enlarge the heart, potentially impairing its function, and damage the arteries, leading to arterial disease.
The higher the blood pressure, the greater the risk of heart disease and stroke. Someone with 130/80 mmHg is at higher risk than someone with 120/70 mmHg, highlighting the need for a healthy lifestyle to maintain optimal blood pressure.
Hypertension can be managed. Mild cases often respond to lifestyle changes, like dietary adjustments and increased exercise. Weight loss alone can sometimes lower high blood pressure.
More severe hypertension may require prescription medications like diuretics and beta-blockers. Diuretics help the body eliminate excess fluids and salt, but potassium levels should be monitored. Beta-blockers lower heart rate and blood output, reducing the risk of heart and brain complications.