à Use of Class III is discouraged by the ESC. Levels of EvidenceLevel of Evidence A Data derived from multiple randomized clinical trials or meta-analyses Level of Evidence B Data derived from a single randomized clinical trial or large nonrandomized studies Level of Evidence C Consensus of opinion of the experts and/or small studies; retrospective studies and registriesFigure 1 Clinical classification of the mode of heart failure (Forrester classification).H I-IV refers to haemodynamic severity, with reference figures for CI and pulmonary capillary pressures shown on the vertical and horizontal axes, respectively.C I-IV refers to clinical severity.
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