Maximum ejection phase: what is it and how is it measured?
The maximum ejection phase is the period in the cardiac cycle during which blood is expelled from the ventricles of the heart at maximum speed. It is an important indicator of the functioning of the cardiovascular system and can be measured using oscillography.
Oscillography is a technique for measuring electrical signals that can be used to measure pressure inside the aorta or other great arteries. To measure the phase of maximum ejection, two moments are determined on an oscilloscope: the moment of appearance of the pressure wave in the aorta or nearby arteries and the moment of transition from a steep decline in the pressure wave to a flat one.
The pressure wave in the aorta is caused by the contraction of the left ventricle of the heart and the pushing of blood into the aorta. This process occurs quickly at first and then slows down. The maximum ejection phase is the period on the oscilloscope when blood is expelled at its maximum rate.
Measuring the maximal ejection phase may be useful in assessing cardiac function and detecting cardiac abnormalities. For example, if the maximum ejection phase is too short or too long, this may indicate problems with the heart.
In addition, measurement of the maximal ejection phase may be useful in exercise training and in assessing the effectiveness of cardiovascular disease treatment.
In conclusion, the maximal ejection phase is an important indicator of cardiovascular performance that can be measured using oscillography. Its measurement can help identify abnormalities in the heart and evaluate the effectiveness of treatment for cardiovascular diseases.
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