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We evaluated whether transthoracic echocardiography (TTE)-derived modified cardiac efficiency (mCE), integrating stroke work and residual LV volume, is associated with short- and long-term mortality in CS and whether its prognostic value differs by shock aetiology.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and results<\/jats:title>\n                    <jats:p>In this retrospective cohort study, consecutive adults admitted with CS to the cardiac intensive care unit at Mayo Clinic (2007\u20132018) were included if TTE was performed within 24 h. mCE was calculated as (stroke volume \u00d7 estimated LV end-systolic pressure) divided by LV end-systolic volume and categorized into quartiles. Primary outcome was in-hospital mortality; secondary outcome was 1-year mortality. Multivariable logistic and Cox models adjusted for illness severity, comorbidity burden, shock aetiology, cardiac arrest, vasoactive therapy, and mechanical circulatory support. Among 667 patients, median mCE was 48 mmHg (IQR 32\u201374). In-hospital mortality was 28% and increased stepwise across decreasing mCE quartiles. The lowest quartile had a 2.5-fold higher adjusted odds of in-hospital death (OR 2.53; 95%CI: 1.49\u20134.37; P &amp;lt; 0.001). One-year mortality was 41%; the lowest quartile had a two-fold higher adjusted hazard of death (HR 2.05; 95%CI: 1.45\u20132.89; P &amp;lt; 0.001). Associations were stronger in acute coronary syndrome-related CS (interaction P = 0.035 for in-hospital; P = 0.015 for 1-year). Within the lowest quartile, reduced systolic pressure further amplified mortality risk.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Early TTE-derived mCE was independently associated with short- and long-term mortality in CS, particularly in acute coronary syndrome-related CS, and captured the interaction between ventricular remodelling and mechanical performance underlying high-risk phenotypes.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/ehjacc\/zuag098","type":"journal-article","created":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T11:28:39Z","timestamp":1784633319000},"page":"752-761","source":"Crossref","is-referenced-by-count":0,"title":["Cardiac mechanical efficiency in patients with cardiogenic shock"],"prefix":"10.1093","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5110-0656","authenticated-orcid":false,"given":"Kristoffer","family":"Berg-Hansen","sequence":"first","affiliation":[{"name":"Department of Cardiology, Aarhus University Hospital , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 ,","place":["Denmark"]},{"name":"Department of Clinical Medicine, Aarhus University , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1009-3768","authenticated-orcid":false,"given":"Oskar Kj\u00e6rgaard","family":"H\u00f8rsdal","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Aarhus University Hospital , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 ,","place":["Denmark"]},{"name":"Department of Clinical Medicine, Aarhus University , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9753-4142","authenticated-orcid":false,"given":"Henrik","family":"Wiggers","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Aarhus University Hospital , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 ,","place":["Denmark"]},{"name":"Department of Clinical Medicine, Aarhus University , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9228-3869","authenticated-orcid":false,"given":"Roni","family":"Nielsen","sequence":"additional","affiliation":[{"name":"Department of Cardiology, Aarhus University Hospital , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 ,","place":["Denmark"]},{"name":"Department of Clinical Medicine, Aarhus University , Palle Juul-Jensens Blvd. 99, Aarhus N 8200 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