Potential new heart failure treatment (IMAGE) Duke-NUS Medical School Caption Images from electrocardiogram (ECG) tests to show heart function. Those with heart failure with preserved ejection fraction (HFpEF), in the middle column, have worse heart diastolic function. Those with HFpEF but given a glucagon receptor blocker (right column) had improved heart diastolic function. Credit Duke-NUS Medical School Usage Restrictions Image Credit: Duke-NUS Medical School License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.