{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T20:16:17Z","timestamp":1787170577289,"version":"build-2736575974"},"reference-count":41,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2013,12,23]],"date-time":"2013-12-23T00:00:00Z","timestamp":1387756800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Echocardiography"],"published-print":{"date-parts":[[2014,7]]},"abstract":"\n Background<\/jats:title>\n \n Preterm infants may have cardiac stress related to patent ductus arteriosus (\n PDA<\/jats:styled-content>\n ) or bronchopulmonary dysplasia (\n BPD<\/jats:styled-content>\n ). In this study, we examined the development of cardiac function in preterm infants by measuring tissue Doppler\u2013derived peak systolic strain (\n PSS<\/jats:styled-content>\n ) and strain rate (\n PSSR<\/jats:styled-content>\n ) in the first 28\u00a0days of life.\n <\/jats:p>\n <\/jats:sec>\n \n Methods<\/jats:title>\n \n Peak systolic strain and strain rate were measured in series in the free wall of the right (\n RV<\/jats:styled-content>\n ) and left (\n LV<\/jats:styled-content>\n ) ventricles on days 1, 7, 14, and 28 of life in 119 preterm infants <1500\u00a0g birth weight along with weight, heart rate, and presence of hemodynamically significant (hs)\n PDA<\/jats:styled-content>\n or\n BPD<\/jats:styled-content>\n . Both were assigned retrospectively. Hs\n PDA<\/jats:styled-content>\n was defined as a\n PDA<\/jats:styled-content>\n requiring intervention whereas\n BPD<\/jats:styled-content>\n was determined based on an infant's need for supplemental oxygen at 36\u00a0weeks of gestational age.\n <\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n Peak systolic strain and strain rate of the\n RV<\/jats:styled-content>\n rose significantly during the first 28\u00a0days of life (P\u00a0<\u00a00.01). Infants who developed\n BPD<\/jats:styled-content>\n had significantly lower\n RV<\/jats:styled-content>\n free wall\n PSS<\/jats:styled-content>\n on days 14 and 28 (P\u00a0<\u00a00.01 and <0.05). Hs\n PDA<\/jats:styled-content>\n resulted in a significantly lower\n PSS<\/jats:styled-content>\n in the\n LV<\/jats:styled-content>\n free wall as of day 14 (P\u00a0<\u00a00.01). After\n PDA<\/jats:styled-content>\n intervention (day 28),\n LV PSS<\/jats:styled-content>\n remained significantly lower (P\u00a0<\u00a00.05), but showed a tendency to increase (P\u00a0=\u00a00.18).\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions<\/jats:title>\n \n Peak systolic strain determined in preterm infants appears to reflect increased afterload (decreased\n RV PSS<\/jats:styled-content>\n in\n BPD<\/jats:styled-content>\n infants) and increased preload (decreased\n LV PSS<\/jats:styled-content>\n in hs\n PDA<\/jats:styled-content>\n infants). The merits of such measurements as a basis for making clinical decisions still need to be explored.\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1111\/echo.12463","type":"journal-article","created":{"date-parts":[[2013,12,24]],"date-time":"2013-12-24T00:15:28Z","timestamp":1387844128000},"page":"765-772","source":"Crossref","is-referenced-by-count":25,"title":["Tissue Doppler\u2013Derived Strain and Strain Rate during the First 28 Days of Life in Very Low Birth Weight Infants"],"prefix":"10.1111","volume":"31","author":[{"given":"Sven","family":"Helfer","sequence":"first","affiliation":[{"name":"Department of Pediatric Cardiology Charit\u00e9 University Medical Center Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lothar","family":"Schmitz","sequence":"additional","affiliation":[{"name":"Department of Pediatric Cardiology Charit\u00e9 University Medical Center Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"B\u00fchrer","sequence":"additional","affiliation":[{"name":"Department of Neonatology Charit\u00e9 University Medical Center Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"Czernik","sequence":"additional","affiliation":[{"name":"Department of Neonatology Charit\u00e9 University Medical Center Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,12,23]]},"reference":[{"key":"e_1_2_7_2_1","first-page":"106","article-title":"The transition from fetal to neonatal circulation: Normal responses and implications for infants with heart disease","volume":"17","author":"Friedman AH","year":"1993","journal-title":"Semin Perinatol"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/pd.1062"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1136\/adc.2007.128777"},{"key":"e_1_2_7_5_1","unstructured":"Althabe F Howson CP Kinney M et al: Born too soon: the global action report on preterm birth [Internet]. 2012. 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