This article reports an individual patient data meta-analysis conducted to define the safe or optimal range of serum potassium concentrations in patients with heart failure (HF) and to determine whether that range differs between HF with reduced ejection fraction (HFrEF) and HF with preserved ejection fraction (HFpEF). The PubMed entry states the clinical uncertainty motivating the study: current practice lacks a clearly established target potassium band for patients with HF, and it is unclear if phenotype-specific targets are needed.
The record identifies the work as a meta-analysis using individual patient data. The PubMed citation notes publication in the European Heart Journal (Eur Heart J) with DOI 10.1093/eurheartj/ehag341 and PubMed ID 42206478. The author list indicates a multinational collaborative effort with contributors from the British Heart Foundation Cardiovascular Research Centre (University of Glasgow), academic centers in the United States, France, and Japan, among others.
The supplied PubMed excerpt does not include the detailed methods section: the text available to this summary does not report which trials or cohort studies were included, the date ranges of source studies, inclusion or exclusion criteria, data harmonization procedures, handling of missing data, or institutional review and data sharing arrangements. Those specifics are not reported in the provided source and should be sought in the full article.
The abstract introduction indicates that the analysis considered at least two major HF phenotypes — HFrEF and HFpEF — implying subgroup analyses by ejection fraction. However, the supplied excerpt does not include the numbers of patients pooled, baseline characteristics (age, sex, comorbidities, baseline renal function), or the operational thresholds used to define HFrEF and HFpEF. Such details are not present in the truncated source text and must be obtained from the full publication.
The PubMed summary does not provide the predefined primary or secondary outcomes for the meta-analysis. Typical endpoints in serum potassium studies include all-cause mortality, cardiovascular mortality, heart-failure hospitalization, and arrhythmic events, but the provided excerpt does not state which outcomes were analyzed here or the statistical models employed (for example, time-to-event modelling, adjustment covariates, spline analyses, or prespecified potassium categories). Because these analytic details are absent from the excerpt, they cannot be summarized here.
The abstract begins by framing the question about a safe potassium range in HF and whether it differs between HF phenotypes. The supplied PubMed text is truncated before any numeric results, point estimates, or directional conclusions are given. Therefore, the following cannot be stated from this source: the optimal numeric serum potassium interval, whether hypo- or hyperkalaemia were associated with increased risk, whether the relationship differed between HFrEF and HFpEF, or any effect modification by background therapies (such as renin–angiotensin–aldosterone system inhibitors or mineralocorticoid receptor antagonists).
From the portion of text available, the clinical significance is the recognition that clinicians lack definitive evidence-based potassium targets in HF and that phenotype-specific guidance may be required. However, because the excerpt omits the study findings, it is not possible here to state practice-changing implications or specific recommendations for potassium monitoring, target ranges, or management strategies.
Unanswered questions in the provided text include:
The PubMed entry and abstract fragment reliably identify the article, authorship, journal, DOI, and the primary research question. However, the supplied source is incomplete and truncated at the start of the abstract. Key methodologic details, numerical results, effect sizes, confidence intervals, subgroup analyses, sensitivity analyses, and the authors’ conclusions are not present in the excerpt.
For clinicians, guideline authors, and researchers seeking to apply the findings or to adjudicate the robustness of the analysis, the full text of the article should be consulted. The full published manuscript will include the complete abstract, methods, detailed results (including patient numbers, event counts, statistical models, and estimated safe potassium ranges), discussion, and any recommended clinical actions.
Note: This rewrite preserves only information present in the provided PubMed excerpt. Specific numerical results, statistical findings, and the authors’ formal conclusions were not included in the available source text and therefore are not reported here.