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The QTc (\u00b1SD) was 392\u00b122 at 4 days, 410\u00b116 (p&gt;0.0001) at 2 months (n=1256), 404\u00b116 at 4 months (n= 1015), 400\u00b116 at 6 months (n=895), and 398\u00b115 at 1 year (n=890). QTc values longer than the mean plus 3 standard deviations were considered prolonged. Heart rate values (beats\/min) were 138\u00b119 at 4 days, 141\u00b113 at 2 months, 134\u00b113 at 4 months, 133\u00b113 at 6 months, and 128\u00b114 at 1 year. In 34 babies the QT interval was prolonged (mean + 3SD) and 3 of these died suddenly: the first, at 3 months (QTc = 470 and HR = 147 at 4 days); the second after 7 weeks (QTc = 514, HR = 115); the third at 3 months (QTc = 464 and HR = 140 at 4 days).<\/jats:p>","DOI":"10.1002\/clc.4960140510","type":"journal-article","created":{"date-parts":[[2009,2,4]],"date-time":"2009-02-04T16:32:57Z","timestamp":1233765177000},"page":"417-421","source":"Crossref","is-referenced-by-count":8,"title":["Prolonged qt interval: A marker of sudden infant death syndrome?"],"prefix":"10.1002","volume":"14","author":[{"given":"Francesco","family":"Perticone","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roberto","family":"Ceravolo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pier Luigi","family":"Mattioli","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2009,2,4]]},"reference":[{"key":"e_1_2_1_2_2","volume-title":"Sudden Infant Death Syndrome","author":"Bergman AB","year":"1970"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1542\/peds.50.4.646"},{"key":"e_1_2_1_4_2","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.286.6371.1092"},{"key":"e_1_2_1_5_2","doi-asserted-by":"crossref","first-page":"844","DOI":"10.1542\/peds.70.6.844","article-title":"Prolonged apnea and cardiac arrhythmias in infants discharged from neonatal intensive care units; failure to predict an increased risk for SIDS","volume":"70","author":"Southall DP","year":"1982","journal-title":"Pediatrics"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1038\/scientificamerican0480-56"},{"key":"e_1_2_1_7_2","first-page":"193","article-title":"SIDS research update","volume":"13","author":"Merritt TA","year":"1984","journal-title":"Pediatr Ann"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(66)91793-4"},{"key":"e_1_2_1_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9343(76)90425-3"},{"key":"e_1_2_1_10_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.54.3.423"},{"key":"e_1_2_1_11_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.66.3.496"},{"key":"e_1_2_1_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0735-1097(85)80539-8"},{"key":"e_1_2_1_13_2","first-page":"210","volume-title":"The Sudden Infant Death Syndrome. 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