Meaning
The numerical difference between the measured systolic and diastolic blood pressure. In a healthy circulatory system, this difference remains low because elastic arteries expand to absorb the force of cardiac contraction. An elevated pulse pressure indicates that the major arteries have lost their elasticity and can no longer buffer the pressure waves.
Vascular Elasticity
When the heart contracts, it ejects blood into the aorta, which stretches to accommodate the volume. During the relaxation phase of the heart, the vessel recoils to push the blood forward. When vessels become rigid, the systolic pressure rises because the artery cannot expand, while the diastolic pressure falls because there is no elastic recoil.
Allostatic Burden
The widening gap between the two pressures increases the mechanical strain on the heart muscle. This demand forces the heart to pump against higher peak pressures, which increases its oxygen demand. At the same time, the lower diastolic pressure reduces the flow of blood to the heart muscle itself.
Circulatory Impact
High systolic peaks travel deep into the microcirculation of sensitive organs. This force damages the delicate capillary walls, leading to tissue scarring and loss of function. This process is particularly damaging to the brain and kidneys.
