Pro-adrenomedullin associates with congestion in acute heart failure patients

Aim: Congestion is a major determinant of outcomes in acute heart failure. Its assessment is complex, making sufficient decongestive therapy a challenge. Residual congestion is frequent at discharge, increasing the risk of re-hospitalization and death. Mid-regional pro-adrenomedullin mirrors vascular integrity and may therefore be an objective marker to quantify congestion and to guide decongestive therapies in patients with acute heart failure.

Methods and results: Observational, prospective, single-centre study in unselected patients presenting with acute heart failure. This study aimed to assess adrenomedullin's association with congestion and clinical outcomes: in-hospital death, post-discharge mortality and in-hospital worsening heart failure according to RELAX-AHF-2 trial criteria. Pro-adrenomedullin was quantified at baseline and at discharge. Congestion was assessed applying clinical scores. Cox and logistic regression models with adjustment for clinical features were fitted. N = 233, median age 77 years (IQR 67, 83), 148 male (63.5%). Median pro-adrenomedullin 2.0 nmol/L (IQR 1.4, 2.9). Eight patients (3.5%) died in hospital and 100 (44.1%) experienced in-hospital worsening heart failure. After discharge, 60 patients (36.6%) died over a median follow-up of 1.92 years (95% CI: 1.76, 2.46). Pro-adrenomedullin concentrations (logarithmized) were significantly associated with congestion, both at enrolment (β = 0.36 and 0.81 depending on score, each P < 0.05) and at discharge (β = 1.12, P < 0.001). Enrolment of pro-adrenomedullin was associated with in-hospital worsening heart failure [OR 4.23 (95% CI: 1.87, 9.58), P < 0.001], and pro-adrenomedullin at discharge was associated with post-discharge death [HR 3.93 (1.86, 8.67), P < 0.001].

Conclusion: Elevated pro-adrenomedullin is associated with in-hospital worsening heart failure and with death during follow-up in patients with acute heart failure. Further research is needed to validate this finding and to explore the ability of pro-adrenomedullin to guide decongestive treatment.