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Considering the established role of Ca2+-handling abnormalities in AF pathogenesis, this study aimed to evaluate if integrating cytosolic Ca2+-handling measurements with clinical risk factors enhances the risk prediction of post-operative AF.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Clinical data from 558 patients undergoing cardiac surgery without pre-existing AF from two centres were analysed. From 94 of these patients, atrial cardiomyocytes were isolated from collected right atrial appendages and Ca2+ handling (L-type Ca2+ current, intracellular Ca2+ concentration) was assessed using patch-clamp. The predictive performance of combining both clinical and single-cell Ca2+ handling parameters was tested using sequential feature selection and logistic regression models.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Single-cell Ca2+-handling parameters through cluster analysis correlated with post-operative AF development and several cardiac diseases. Integration of Ca2+-handling parameters into a new post-operative AF risk prediction model improved its predictive accuracy by increasing the areas under the receiver operating characteristic (ROC) curves from 0.69 to 0.71 in the training and 0.76 to 0.79 in the validation cohort. Systolic Ca2+ level, along with clinical parameters such as age, left atrial dilatation, valvular heart disease, impaired renal function, and serum magnesium, was identified as an independent risk factor for post-operative AF. Additionally, a predictive score for AF occurrence at discharge and during rehabilitation has been developed, with area under the curve (AUC) values of 0.84 and 0.71, respectively. Incorporating the occurrence of AF during the immediate post-operative period as an additional predictor significantly enhanced the prediction of AF at discharge, achieving an AUC value of 0.94.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Integrating cellular Ca2+ handling signature with clinical predictors improves the prediction of post-operative AF, highlighting the potential of incorporating functional cellular data into clinical risk models.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/eurheartj\/ehaf609","type":"journal-article","created":{"date-parts":[[2025,8,5]],"date-time":"2025-08-05T11:34:43Z","timestamp":1754393683000},"page":"1609-1621","source":"Crossref","is-referenced-by-count":3,"title":["Cytosolic calcium handling signature: integration with clinical predictors enhances prediction of post-operative atrial fibrillation"],"prefix":"10.1093","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6683-6079","authenticated-orcid":false,"given":"Funsho E","family":"Fakuade","sequence":"first","affiliation":[{"name":"Institute of Pharmacology and Toxicology, University Medical Centre G\u00f6ttingen , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]},{"name":"DZHK (German Centre for Cardiovascular Research), Partner Site Lower Saxony , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]},{"name":"Cluster of Excellence \u2018Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells\u2019 (MBExC), University Medical Centre G\u00f6ttingen, Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]},{"name":"Department of Cardiothoracic and Vascular Surgery, University Medical Centre G\u00f6ttingen , G\u00f6ttingen ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-4953-1409","authenticated-orcid":false,"given":"Judith","family":"Gronwald","sequence":"additional","affiliation":[{"name":"Institute of Pharmacology and Toxicology, University Medical Centre G\u00f6ttingen , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]},{"name":"DZHK (German Centre for Cardiovascular Research), Partner Site Lower Saxony , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]},{"name":"Department of Cardiology and Pneumology, University Medical Centre G\u00f6ttingen , G\u00f6ttingen ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paulina","family":"Brandes","sequence":"additional","affiliation":[{"name":"Institute of Pharmacology and Toxicology, University Medical Centre G\u00f6ttingen , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]},{"name":"DZHK (German Centre for Cardiovascular Research), Partner Site Lower Saxony , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5060-8610","authenticated-orcid":false,"given":"Yannic","family":"D\u00f6ring","sequence":"additional","affiliation":[{"name":"Institute of Pharmacology and Toxicology, University Medical Centre G\u00f6ttingen , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]},{"name":"DZHK (German Centre for Cardiovascular Research), Partner Site Lower Saxony , Robert-Koch-Stra\u00dfe 40, 37075 G\u00f6ttingen ,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5118-5330","authenticated-orcid":false,"given":"Tony","family":"Rubio","sequence":"additional","affiliation":[{"name":"Institute of Pharmacology and Toxicology, University Medical 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