Diastolic dysfunction must be differentiated from diastolic heart failure. Pulse pressure is the difference between systolic and diastolic blood pressure. For each heartbeat, blood pressure varies between systolic and diastolic pressures. The difference between the systolic and diastolic pressure is called the pulse pressure. Amyloid deposition in the heart can cause both diastolic and systolic heart failure. This results in both systolic and diastolic dysfunction. This permitted systolic and diastolic pressure to be measured. The degree of expansion displayed by artery during diastolic and systolic state is called volume. MUGA imaging is an earlier mathematical attempt to distinguish systolic from diastolic heart failure. Causes of isolated right ventricular diastolic failure are uncommon. Right heart catheterization is the test used to test for elevated diastolic ventricular pressures. This leads to a corresponding increase in left ventricular end diastolic volume. No decrease of the diastolic function of the left ventricle occurs. Ayahuasca also has cardiovascular effects, moderately increasing heart rate and diastolic blood pressure. The protein is a key regulator of cardiac diastolic function.