An older adult patient is admitted with acute exacerbation of congestive heart failure.

Heart failure with preserved ejection fraction (HFpEF) is a type of heart failure that occurs when the heart muscle is stiff and does not relax well, causing high pressure in the heart and lungs. HFpEF is diagnosed when the patient has symptoms and signs of heart failure and a normal or high ejection fraction (EF), which is the percentage of blood pumped out of the left ventricle with each heartbeat. HFpEF is usually caused by conditions that affect the heart or blood vessels, such as aging, high blood pressure, diabetes, obesity, or kidney disease12

References:

What Is Heart Failure with Preserved Ejection Fraction? - Healthline

Heart failure with preserved ejection fraction - BMJ Best Practice