Seagull HL888HA, Manual

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2
Introduction
What is blood pressure?
Blood pressure is the pressure or the force of blood fl owing against
the walls of the arteries. Blood pressure is constantly changing
during the course of the cardiac cycle. Systolic blood pressure is
the highest pressure in the cycle.
Diastolic blood pressure is the lowest pressure in the cycle.
Both pressure readings, the Systolic rate and the Diastolic rate,
are information for the physician to evaluate the status of patient’s
blood pressure. Many factors such as physical activities, anxieties,
time of day, can in
fl uence one’s blood pressure. Blood pressure
is typically low in the morning and increases from afternoon to the
evening. It is lower in the summer and higher in the winter.
WHO klassifikation.
Standards for assessing high or low blood pressure without regard
to age have been established by the World Health Organization
(WHO) as shown in the chart.