 Hypertension has also been linked with diastolic heart failure, a condition where the squeeze of the heart is normal but it relaxes abnormally causing shortness of breath, edema and fatigue. Up to one half of cases of heart failure are caused by diastolic heart failure. Recent evidence shows that the lining cells of the heart also produce NO and that this promotes relaxation of the heart. In addition, studies here at Emory have shown that in animals with high blood pressure, NO production in the heart is reduced compared to normals. 