What are the long term consequences of acute on chronic diastolic heart failure?

Depends: I assume you mean chronic diastolic heart failure with acute exacerbation.Its what happens in diastolic heart failure-subject to intermittent acute exacerbation.It is particularly sensitive to heart rate and fluid volume.sudden death is another consequence besides heart failure. Atrial fibrillation is common and therefore stroke risk.Others die from comoerbiditieswhich are frequent such as kidney