{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T06:14:45Z","timestamp":1787984085995,"version":"build-2784847793"},"reference-count":33,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2026,2,3]],"date-time":"2026-02-03T00:00:00Z","timestamp":1770076800000},"content-version":"vor","delay-in-days":2955,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2018,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Right atrial area (RAA) is a prognostic factor in human patients with pulmonary arterial hypertension (PAH). Reference intervals for RAA have been described in healthy dogs.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To evaluate RAA indexed to the body surface area in dogs with PAH as an indicator of right atrial size, PAH severity and right-sided congestive heart failure (R-CHF).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Animals<\/jats:title>\n                    <jats:p>A total of 119 client-owned dogs, 48 dogs with PAH and 71 control dogs.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Prospective observational study. Pulmonary arterial hypertension was classified according to the tricuspid regurgitation pressure gradient (TRPG) as mild (36\u201350\u00a0mmHg), moderate (51\u201375\u00a0mmHg), or severe (&amp;gt;75\u00a0mmHg). The RAA index was calculated as the RAA divided by body surface area.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The RAA index was higher in dogs with moderate PAH (13.3\u00a0cm2\/m2; range, 3.4\u201324.7\u00a0cm2\/m2) and severe PAH (12.1\u00a0cm2\/m2; range, 5.4\u201321.8\u00a0cm2\/m2) than in those with mild PAH (6.7\u00a0cm2\/m2; range, 4.8\u201310.7\u00a0cm2\/m2) or in controls (7.3\u00a0cm2\/m2; range, 4.2\u201310.2\u00a0cm2\/m2; P\u00a0&amp;lt;\u00a00.001). The RAA index was higher (P\u00a0&amp;lt;\u00a00.0001) in dogs with R-CHF (17.5\u00a0cm2\/m2; range, 12.7\u201324.7\u00a0cm2\/m2) compared to those without R-CHF (7.6\u00a0cm2\/m2; range, 4.4\u201319.4\u00a0cm2\/m2). The most accurate cutoff value of the RAA index to identify R-CHF was &amp;gt;12.3\u00a0cm2\/m2 (sensitivity, 100%; specificity, 89.5%). In dogs with PAH, severity of tricuspid regurgitation (TR) was the only independent predictor of RAA index based on multivariate analysis (P\u00a0&amp;lt;\u00a00.02).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions and Clinical Importance<\/jats:title>\n                    <jats:p>The RAA index can be used to evaluate right atrial size in dogs and may be more effective than TRPG in predicting R-CHF in dogs with PAH. The severity of TR is the main determinant of the RAA index in dogs with PAH.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jvim.15035","type":"journal-article","created":{"date-parts":[[2018,1,29]],"date-time":"2018-01-29T14:03:44Z","timestamp":1517234624000},"page":"42-47","source":"Crossref","is-referenced-by-count":34,"title":["Echocardiographic Evaluation of the Right Atrial Area Index in Dogs with Pulmonary Hypertension"],"prefix":"10.1093","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8301-6582","authenticated-orcid":false,"given":"T.","family":"Vezzosi","sequence":"first","affiliation":[{"name":"University of Pisa Department of Veterinary Sciences, , Pisa,","place":["Italy"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"O.","family":"Domenech","sequence":"additional","affiliation":[{"name":"Istituto Veterinario di Novara , 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