diastolinen

Diastolinen is an adjective in Finnish medical terminology meaning "diastolic," relating to diastole, the relaxation phase of the cardiac cycle. During diastole the heart muscle relaxes and the ventricles fill with blood. The atrioventricular valves are open, and in the late phase atrial contraction can contribute a final portion of ventricular filling.

Diastole is important for coronary perfusion, because the coronary arteries primarily receive blood flow when the heart is relaxed and the aortic pressure is sufficient. The duration of diastole lengthens at slower heart rates and shortens with tachycardia, influencing how much blood the heart chambers can fill.

Diastolic function refers to the heart's ability to relax and fill. Impaired relaxation is diastolic dysfunction, which can occur with aging or diseases such as hypertension, hypertrophic cardiomyopathy, or previous myocardial infarction. Diastolic dysfunction can contribute to heart failure with preserved ejection fraction (HFpEF), where filling is abnormal despite a normal systolic pumping capacity.

Blood pressure has two components: systolic and diastolic. Diastolic blood pressure is the arterial pressure during the heart’s relaxation between beats. Normal diastolic pressure is typically around 60-80 mmHg; readings above 80-89 mmHg are often considered elevated, and 90 mmHg or higher is commonly categorized as hypertension in many guidelines. Assessment of diastolic function uses imaging methods such as echocardiography and Doppler measurements (for example the E/A ratio and tissue Doppler e’ velocity) to estimate filling pressures.