Diastole
Diastole (pronounced: /daɪˈæstəliː/) is a term used in the medical field, specifically in cardiology, to describe the phase of the heartbeat during which the heart muscle relaxes and allows the chambers to fill with blood.
Etymology
The term "diastole" originates from the Greek word "diastole," which means dilation or expansion. It was first used in the medical context in the 16th century.
Phases of Diastole
Diastole consists of three phases: the isovolumetric relaxation phase, the rapid filling phase, and the atrial contraction phase.
- Isovolumetric relaxation phase: This is the initial phase of diastole, occurring immediately after systole. During this phase, all four heart valves are closed, and the ventricles begin to relax.
- Rapid filling phase: This phase follows the isovolumetric relaxation phase. The mitral valve and tricuspid valve open, allowing blood to flow into the ventricles from the atria.
- Atrial contraction phase: This is the final phase of diastole. The atria contract, pushing the remaining blood into the ventricles.
Clinical Significance
Diastole is a crucial part of the cardiac cycle. Abnormalities in diastolic function can lead to conditions such as diastolic heart failure and hypertension. Measurement of diastolic function is often done using echocardiography.
Related Terms
External links
- Medical encyclopedia article on Diastole
- Wikipedia's article - Diastole
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