{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,11]],"date-time":"2025-09-11T18:46:26Z","timestamp":1757616386673,"version":"3.44.0"},"reference-count":15,"publisher":"Elsevier BV","issue":"4","license":[{"start":{"date-parts":[[1988,1,1]],"date-time":"1988-01-01T00:00:00Z","timestamp":567993600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[1988,1,1]],"date-time":"1988-01-01T00:00:00Z","timestamp":567993600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/legal\/tdmrep-license"}],"content-domain":{"domain":["clinicalkey.com","clinicalkey.com.au","clinicalkey.es","clinicalkey.fr","clinicalkey.jp","elsevier.com","sciencedirect.com"],"crossmark-restriction":true},"short-container-title":["Journal of Electrocardiology"],"published-print":{"date-parts":[[1988]]},"DOI":"10.1016\/0022-0736(88)90114-8","type":"journal-article","created":{"date-parts":[[2004,4,18]],"date-time":"2004-04-18T16:52:31Z","timestamp":1082307151000},"page":"369-375","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":6,"title":["Frontal-plane QRS axis revisited: Accuracy of current approximations and reappraisal of their merit in the diagnosis of right ventricular hypertrophy"],"prefix":"10.1016","volume":"21","author":[{"given":"Cassiano","family":"Abreu-Lima","sequence":"first","affiliation":[]},{"given":"Joaquim P.","family":"Marques de Sa","sequence":"additional","affiliation":[]},{"given":"Gil","family":"Coelho","sequence":"additional","affiliation":[]},{"given":"Jorge","family":"Almeida","sequence":"additional","affiliation":[]},{"given":"Fernando","family":"Silva-Carvalho","sequence":"additional","affiliation":[]},{"given":"Carlos","family":"Hernandez","sequence":"additional","affiliation":[]}],"member":"78","reference":[{"key":"10.1016\/0022-0736(88)90114-8_BIB1","first-page":"11","article-title":"Recommendations for standardization of leads and specifications for instruments in electrocardiography and vectorcardiography: report of the Committee on Electrocardiography, American Heart Association","volume":"52","author":"Pipberger","year":"1975","journal-title":"Circulation"},{"key":"10.1016\/0022-0736(88)90114-8_BIB2","series-title":"Electrocardiology","first-page":"179","article-title":"A microcomputer-based system for ECG analysis and interpretation","author":"Abreu-Lima","year":"1984"},{"key":"10.1016\/0022-0736(88)90114-8_BIB3","series-title":"Electrocardiology","first-page":"283","article-title":"Evaluation of a new program for ECG wave recognition and measurement","author":"Marques de Sa","year":"1984"},{"key":"10.1016\/0022-0736(88)90114-8_BIB4","doi-asserted-by":"crossref","first-page":"344","DOI":"10.1093\/biomet\/43.3-4.344","article-title":"On the construction of significance tests on the circle and the sphere","volume":"43","author":"Watson","year":"1956","journal-title":"Biometrika"},{"key":"10.1016\/0022-0736(88)90114-8_BIB5","series-title":"Vectorcardiography. 2: Proceedings XIth International Vectorcardiography Symposium","first-page":"216","article-title":"Statistical methods for vectorcardiogram orientations","author":"Downs","year":"1971"},{"year":"1963","series-title":"Documenta geigy: tables scientifiques","author":"Diem","key":"10.1016\/0022-0736(88)90114-8_BIB6"},{"year":"1961","series-title":"Differentiation between normal and abnormal in electrocardiography","author":"Simonson","key":"10.1016\/0022-0736(88)90114-8_BIB7"},{"key":"10.1016\/0022-0736(88)90114-8_BIB8","doi-asserted-by":"crossref","first-page":"1252","DOI":"10.1161\/01.CIR.67.6.1252","article-title":"A new ECG classification system for myocardial infarction based on receiver operating characteristic curve analysis and information theory","volume":"67","author":"Abreu-Lima","year":"1983","journal-title":"Circulation"},{"key":"10.1016\/0022-0736(88)90114-8_BIB9","doi-asserted-by":"crossref","first-page":"990","DOI":"10.1126\/science.182.4116.990","article-title":"The relative operating characteristic in psychology","volume":"182","author":"Swets","year":"1973","journal-title":"Science"},{"key":"10.1016\/0022-0736(88)90114-8_BIB10","doi-asserted-by":"crossref","first-page":"297","DOI":"10.1148\/109.2.297","article-title":"Evaluation of receiver operating characteristic curve data in terms of information theory with applications in radiography","volume":"109","author":"Metz","year":"1973","journal-title":"Radiology"},{"key":"10.1016\/0022-0736(88)90114-8_BIB11","doi-asserted-by":"crossref","first-page":"248","DOI":"10.1016\/S0033-0620(59)80005-0","article-title":"Current status and persistent problems of electrode placement and lead systems for vectorcardiography and electrocardiography","volume":"2","author":"Pipberger","year":"1959","journal-title":"Prog Cardiovasc Dis"},{"key":"10.1016\/0022-0736(88)90114-8_BIB12","doi-asserted-by":"crossref","first-page":"34","DOI":"10.1016\/0002-8703(61)90514-2","article-title":"Correlation of clinical information in the standard 12-lead ECG and in a corrected orthogonal 3-lead ECG","volume":"61","author":"Pipberger","year":"1961","journal-title":"Am Heart J"},{"year":"1982","series-title":"Pediatric electrocardiography","author":"Liebman","key":"10.1016\/0022-0736(88)90114-8_BIB13"},{"year":"1974","series-title":"Contribui\u00e7\u00e3o para o desenvolvimento de um sistema de electrocardiografia computorizada","author":"Abreu-Lima","key":"10.1016\/0022-0736(88)90114-8_BIB14"},{"key":"10.1016\/0022-0736(88)90114-8_BIB15","doi-asserted-by":"crossref","first-page":"915","DOI":"10.1161\/01.CIR.63.4.915","article-title":"Application of information theory to clinical diagnostic testing: the electrocardiographic stress test","volume":"63","author":"Diamond","year":"1981","journal-title":"Circulation"}],"container-title":["Journal of Electrocardiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0022073688901148?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0022073688901148?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2025,9,5]],"date-time":"2025-09-05T18:31:50Z","timestamp":1757097110000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0022073688901148"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1988]]},"references-count":15,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1988]]}},"alternative-id":["0022073688901148"],"URL":"https:\/\/doi.org\/10.1016\/0022-0736(88)90114-8","relation":{},"ISSN":["0022-0736"],"issn-type":[{"type":"print","value":"0022-0736"}],"subject":[],"published":{"date-parts":[[1988]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"Frontal-plane QRS axis revisited: Accuracy of current approximations and reappraisal of their merit in the diagnosis of right ventricular hypertrophy","name":"articletitle","label":"Article Title"},{"value":"Journal of Electrocardiology","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/0022-0736(88)90114-8","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"converted-article","name":"content_type","label":"Content Type"},{"value":"Copyright \u00a9 1988 Published by Elsevier Inc.","name":"copyright","label":"Copyright"}]}}