Merck Manual

Please confirm that you are a health care professional

Heart failure may involve systolic or diastolic dysfunction. In diastolic dysfunction, the heart wall is thickened and not enough blood is able to fill the lower chambers before being pumped to the body. In systolic dysfunction, the heart wall is stretched and weak, making it unable to pump out enough blood. Both conditions lead to poor circulation.
Heart failure may involve systolic or diastolic dysfunction. In diastolic dysfunction, not enough blood is able to fill the heart before pumping. In systolic dysfunction, the heart is too weak to pump out enough blood. Both conditions lead to poor circulation.
Heart failure may involve systolic or diastolic dysfunction. In diastolic dysfunction, the heart wall is thickened and not enough blood is able to fill the lower chambers before being pumped to the body. In systolic dysfunction, the heart wall is stretched and weak, making it unable to pump out enough blood. Both conditions lead to poor circulation.