[…] fraction high-output heart failure occurs in a minority of patients cardiac output exceeds metabolic demand decompensated heart failure occurs when symptoms are worsened or exacerbated
[medbullets.com]
[…] heart failure, the term “heart failure exacerbation” is used.
[healio.com]
[…] failure), stage a Chf (congestive heart failure), stage b Chf (congestive heart failure), stage c Chf (congestive heart failure), stage d CHF due to valvular disease CHF exacerbation
[icd9data.com]