{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,7]],"date-time":"2026-11-07T03:44:35Z","timestamp":1794023075918,"version":"4.8.0"},"reference-count":19,"publisher":"Oxford University Press (OUP)","issue":"3","license":[{"start":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T00:00:00Z","timestamp":1781654400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"British Heart Foundation Senior Clinical Research Fellowship","award":["FS\/SCRF\/22\/32014"],"award-info":[{"award-number":["FS\/SCRF\/22\/32014"]}]},{"name":"British Heart Foundation Intermediate Clinical Research Fellowship","award":["FS\/ICRF\/24\/26111"],"award-info":[{"award-number":["FS\/ICRF\/24\/26111"]}]},{"name":"Sir Henry Dale Fellowship"},{"DOI":"10.13039\/100010269","name":"Wellcome Trust","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100010269","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000288","name":"Royal Society","doi-asserted-by":"publisher","award":["221805\/Z\/20\/Z"],"award-info":[{"award-number":["221805\/Z\/20\/Z"]}],"id":[{"id":"10.13039\/501100000288","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Slovak Grant Agencies VEGA","award":["2\/0004\/23"],"award-info":[{"award-number":["2\/0004\/23"]}]},{"name":"Slovak Grant Agencies VEGA","award":["21\u20130299"],"award-info":[{"award-number":["21\u20130299"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,7,2]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Aims<\/jats:title>\n                    <jats:p>The cardiac phosphocreatine-to-ATP ratio (PCr\/ATP) is the principal non-invasive biomarker of myocardial energetic status and is measured by phosphorus magnetic resonance spectroscopy (31P-MRS). However, studies of cardiac energetics are typically from single centres with relatively small numbers of patients, leading to unknown generalizability.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and results<\/jats:title>\n                    <jats:p>Here, we use systematic review and meta-analysis of all available studies reporting cardiac PCr\/ATP ratios to show pooled reference values across populations (databases searched: Embase, Medline, CENTRAL). We collected data on differing methodological factors to enable adjustment. We included 176 studies comprising 7843 individual participant magnetic resonance examinations between 1987 and 2025. The pooled PCr\/ATP ratio was 1.96 for healthy volunteers (n = 2988), 1.54 for heart failure with reduced ejection fraction (n = 575; a 21% reduction), and 1.60 for heart failure with preserved ejection fraction (n = 146; an 18% reduction) with further reductions seen across other disease states including valvular disease and diabetes. Methodological factors, including field strength, sequence type, and voxel location significantly, influenced measurements, though adjustment had minimal effect on pooled estimates. Body mass index and natriuretic peptides negatively correlated with PCr\/ATP, whilst left ventricular systolic function showed positive correlation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>This comprehensive meta-analysis provides reference PCr\/ATP values across cardiac conditions, implicating energetic impairment as a common pathway spanning myocardial diseases of diverse aetiology, and suggests that methodological heterogeneity does not fully account for the observed between-group differences.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Registration<\/jats:title>\n                    <jats:p>PROSPERO (CRD420251081946).<\/jats:p>\n                  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Magnetic Resonance Research, Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, John Radcliffe Hospital , Oxford OX3 9DU ,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew J M","family":"Lewis","sequence":"additional","affiliation":[{"name":"Oxford Centre for Clinical Magnetic Resonance Research, Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, John Radcliffe Hospital , Oxford OX3 9DU ,","place":["United Kingdom"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1295-7769","authenticated-orcid":false,"given":"O J","family":"Rider","sequence":"additional","affiliation":[{"name":"Oxford Centre for Clinical Magnetic Resonance Research, Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, John Radcliffe Hospital , Oxford OX3 9DU ,","place":["United 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