Systolic and diastolic phases & Repeated measurement detects silent elevation

Systolic and diastolic phases

Blood pressure is the force of blood against artery walls. Systolic pressure describes the heart’s contraction and pumping phase; diastolic pressure describes the resting interval between beats. A reading lists systolic first and diastolic second. These values describe phases of circulation, not pulse rate or two separate organs. Following the cardiac cycle explains why arterial pressure changes within each beat and why both numbers matter in interpreting a reading.

Repeated measurement detects silent elevation

High pressure commonly produces no obvious symptoms. Clinicians measure with a cuff and generally assess repeated readings before diagnosing sustained hypertension. A single measurement can differ with circumstances and technique. Children’s values require consideration of age, height, and sex rather than simply using adult categories. Feeling well, having a normal pulse, or observing one reassuring reading does not by itself establish that the overall pressure pattern is normal.

Key concepts

Systolic and diastolic phases

Blood pressure is the force of blood against artery walls.

Repeated measurement detects silent elevation

High pressure commonly produces no obvious symptoms.

Primary versus secondary hypertension

Primary hypertension is the common form that generally develops over time.

Persistent pressure and organ damage

Sustained high pressure makes the heart work harder and can contribute to heart attack, stroke, heart failure, or kidney failure.

References

• MedlinePlus en español — Blood Pressure Physiology