Diastolic pressure

Definition

Diastolic pressure is the minimum arterial pressure during the relaxation phase of the heart cycle when the heart ventricles are filled with blood. It's typically measured in millimeters of mercury (mmHg).

5 Must Know Facts For Your Next Test

1. Diastolic pressure is a key component of blood pressure readings, represented as the lower number in a blood pressure measurement (e.g., 120/80 mmHg).
2. It reflects the resistance to blood flow in the arteries when the heart is at rest between beats.
3. Normal diastolic pressure for an adult ranges from 60 to 80 mmHg.
4. High diastolic pressure can indicate increased resistance in the arteries and potential cardiovascular issues.
5. Fluid statics principles help explain how diastolic pressure represents equilibrium conditions within arterial walls.

Review Questions

• What does diastolic pressure represent in a blood pressure reading?
• How does diastolic pressure relate to fluid statics principles?
• Why is it important to monitor diastolic pressure in clinical settings?

Related terms

Systolic Pressure: The maximum arterial pressure during the contraction phase of the heart cycle, represented as the upper number in a blood pressure reading.

Gauge Pressure: Pressure relative to atmospheric pressure, often used in measuring blood pressures where atmospheric influence is considered zero.

Absolute Pressure: $P_{abs} = P_{gauge} + P_{atm}$; total force per unit area exerted on a surface, including atmospheric and gauge pressures.