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Diastolic dysfunction refers to when the diastole part of this action is abnormal. The ventricles do not properly relax and become stiff meaning they cannot fill with blood properly. Grade 1 is the mildest form of diastolic heart failure and is referred to as an abnormal relaxation pattern. Patients are usually asymptomatic. Grade II – This diastolic dysfunction is characterized by increased filling pressure in the atrium and is considered to be moderate stage disease.
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