Diastólísk

Diastólísk refers to the diastolic phase of the cardiac cycle, which is the period of relaxation and filling of the heart's chambers. Specifically, it is the time when the ventricles, the lower chambers of the heart, are relaxed and refilling with blood from the atria, the upper chambers. This relaxation allows the heart muscle to recover between contractions.

During diastole, the atrioventricular valves (mitral and tricuspid valves) are open, permitting blood to flow from the atria into the ventricles. Simultaneously, the semilunar valves (aortic and pulmonary valves) are closed, preventing the backflow of blood into the arteries that were previously filled during the systolic phase (contraction). The pressure within the ventricles is at its lowest point during diastole.

Diastolic blood pressure is the minimum arterial pressure during relaxation and dilatation of the heart chambers when the blood rushes into the heart through the atria and the ventricles. It is the second number in a blood pressure reading, such as 120/80 mmHg, where 80 mmHg represents the diastolic pressure. Elevated diastolic pressure can be an indicator of hypertension, a condition that increases the risk of heart disease and stroke. The duration and efficiency of diastole are crucial for maintaining adequate cardiac output and overall cardiovascular health.