{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T10:27:05Z","timestamp":1787740025568,"version":"build-2784847793"},"reference-count":152,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"7","license":[{"start":{"date-parts":[[2025,2,18]],"date-time":"2025-02-18T00:00:00Z","timestamp":1739836800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["Circulation"],"published-print":{"date-parts":[[2025,2,18]]},"abstract":"<jats:sec>\n            <jats:title>BACKGROUND:<\/jats:title>\n            <jats:p>Dilated cardiomyopathy (DCM) appears to be diagnosed twice as often in male than in female patients. This could be attributed to underdiagnosis in female patients or sex differences in susceptibility. Up to 30% of cases have an autosomal dominant monogenic cause, where equal sex prevalence would be expected. The aim of this systematic review, meta-analysis, and population study was to assess the sex ratio in patients with DCM, stratified by genetic status, and evaluate whether this is influenced by diagnostic bias.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>METHODS:<\/jats:title>\n            <jats:p>\n              A literature search identified DCM patient cohorts with discernible sex ratios. Exclusion criteria were studies with a small (n&lt;100), pediatric, or peripartum population. Meta-analysis and metaregression compared the proportion of female participants for an overall DCM cohort and the following subtypes: all genetic DCM, individual selected DCM genes (\n              <jats:italic>TTN<\/jats:italic>\n              and\n              <jats:italic>LMNA<\/jats:italic>\n              ), and gene-elusive DCM. Population DCM sex ratios generated from diagnostic codes were also compared with those from sex-specific means using the UK Biobank imaging cohort; this established ICD coded, novel imaging-first, and genotype first determined sex ratios.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>RESULTS:<\/jats:title>\n            <jats:p>\n              A total of 99 studies, with 37 525 participants, were included. The overall DCM cohort had a 0.30 female proportion (95% CI, 0.28\u20130.32), corresponding to a male:female ratio (M:F) of 2.38:1. This was similar to patients with an identified DCM variant (0.31 [95% CI, 0.26\u20130.36]; M:F 2.22:1;\n              <jats:italic>P<\/jats:italic>\n              =0.56). There was also no significant difference when compared with patients with gene-elusive DCM (0.30 [95% CI, 0.24\u20130.37]; M:F 2.29:1;\n              <jats:italic>P<\/jats:italic>\n              =0.81). Furthermore, the ratio within autosomal dominant gene variants was not significantly different for\n              <jats:italic>TTN<\/jats:italic>\n              (0.28 [95% CI, 0.22\u20130.36]; M:F 2.51:1;\n              <jats:italic>P<\/jats:italic>\n              =0.82) or\n              <jats:italic>LMNA<\/jats:italic>\n              (0.35 [95% CI, 0.27\u20130.44]; M:F 1.84:1;\n              <jats:italic>P<\/jats:italic>\n              =0.41). Overall, the sex ratio for DCM in people with disease attributed to autosomal dominant gene variants was similar to the all-cause group (0.34 [95% CI, 0.28\u20130.40]; M:F 1.98:1;\n              <jats:italic>P<\/jats:italic>\n              =0.19). In the UK Biobank (n=47 549), DCM defined by International Classification of Diseases, 10th revision, coding had 4.5:1 M:F. However, implementing sex-specific imaging-first and genotype-first diagnostic approaches changed this to 1.7:1 and 2.3:1, respectively.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>CONCLUSIONS:<\/jats:title>\n            <jats:p>This study demonstrates that DCM is twice as prevalent in male patients. This was partially mitigated by implementing sex-specific DCM diagnostic criteria. The persistent male excess in genotype-positive patients with an equally prevalent genetic risk suggests additional genetic or environmental drivers for sex-biased penetrance.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>REGISTRATION:<\/jats:title>\n            <jats:p>\n              URL:\n              <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/www.crd.york.ac.uk\/prospero\">https:\/\/www.crd.york.ac.uk\/prospero<\/jats:ext-link>\n              ; Unique identifier: CRD42023451944.\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1161\/circulationaha.124.070872","type":"journal-article","created":{"date-parts":[[2025,2,3]],"date-time":"2025-02-03T10:00:16Z","timestamp":1738576816000},"page":"442-459","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":15,"title":["Systematic Review, Meta-Analysis, and Population Study to Determine the Biologic Sex Ratio in Dilated Cardiomyopathy"],"prefix":"10.1161","volume":"151","author":[{"given":"Natalie","family":"Bergan","sequence":"first","affiliation":[{"name":"National Heart Lung Institute, Imperial College London, UK (N.B., L.C., K.A.M., B.P.H., J.S.W., U.T.)"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3892-9566","authenticated-orcid":true,"given":"Ishika","family":"Prachee","sequence":"additional","affiliation":[{"name":"Royal Brompton &amp; 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