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..................................... patients with this pathology. Selected experts in the field undertook a comprehensive review of the published evidence for management of a given condition according to ESC Committee for Practice Guidelines (CPG) policy. A critical evaluation of diagnostic and therapeutic procedures was performed, including assessment of the riskbenefit ratio. The level of evidence and the strength of the recommendation of particular management options were weighed and graded according to predefined scales, as outlined below.

The experts of the writing and reviewing panels provided declaration of interest forms for all relationships that might be perceived as real or potential sources of conflicts of interest. Their declarations of interest were reviewed according to the ESC declaration of interest rules and can be found on the ESC website (http://www.escardio.org/ guidelines). This process ensures transparency and prevents potential biases in the development and review processes. Any changes in declarations of interest that arise during the writing period were notified to the ESC and updated. The Task Force received its entire financial support from the ESC without any involvement from the healthcare industry.

The ESC CPG supervises and coordinates the preparation of new Guidelines. The Committee is also responsible for the endorsement process of these Guidelines. The ESC Guidelines undergo extensive review by the CPG and external experts. After appropriate revisions the Guidelines are approved by all the experts involved in the Task

Table 1 Classes of recommendations

Classes of recommendations Class I Evidence and/or general agreement that a given treatment or procedure is Is recommended or is indicated

Wording to use

Class III Evidence or general agreement that the given treatment or procedure is not useful/effective, and in some cases may be harmful. Is not recommended

Class IIb

established by evidence/opinion. May be considered

Class IIa Weight of evidence/opinion is in Should be considered

Class II

©ESC 2020

Table 2 Levels of evidence

Level 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 non-randomized studies.

Level of evidence C Consensus of opinion of the experts and/or small studies, retrospective studies, registries. ©ESC 2020 Downloaded from academic.oup.com/eurheartj/article/42/6/563/5898606 by guest on 07 October 2026