Diastolisen

Diastolisen refers to the diastolic phase of the cardiac cycle, which is the period when the heart muscle relaxes and allows the chambers to fill with blood. This phase occurs between the end of ventricular systole (contraction) and the beginning of the next cardiac cycle. The term "diastolic" originates from the Greek word "diastole," meaning "expansion" or "dilatation," reflecting the relaxation and expansion of the heart chambers during this phase.

During diastole, the atria and ventricles relax, enabling blood to flow passively from the atria into the ventricles through the open atrioventricular (AV) valves (tricuspid and mitral valves). The semilunar valves (aortic and pulmonary) remain closed during this phase to prevent backflow of blood into the ventricles. The relaxation of the ventricles also reduces pressure within them, allowing the AV valves to open and facilitating ventricular filling.

Diastolic function is critical for maintaining efficient cardiac output and overall cardiovascular health. Impaired diastole, often referred to as diastolic dysfunction, can lead to conditions such as heart failure with preserved ejection fraction (HFpEF), where the heart struggles to relax and fill properly. Factors such as hypertension, aging, and certain cardiac diseases can contribute to diastolic dysfunction.

Diastolic blood pressure, another related concept, refers to the pressure within the arteries when the heart is at rest between beats. It is a key component of blood pressure measurements, often expressed alongside systolic pressure (e.g., 120/80 mmHg). Monitoring diastolic pressure is important for assessing cardiovascular risk and diagnosing conditions like hypertension.

In clinical practice, evaluating diastolic function may involve imaging techniques such as echocardiography, which assesses the heart's filling patterns and relaxation rates. Understanding diastolisen and its mechanics helps clinicians diagnose and manage cardiac conditions effectively.