{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,12]],"date-time":"2026-05-12T12:16:02Z","timestamp":1778588162080,"version":"3.51.4"},"reference-count":12,"publisher":"BMJ","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arch Dis Child Fetal Neonatal Ed"],"published-print":{"date-parts":[[1996,7]]},"abstract":"<jats:p>Intraobserver variation associated with the non-invasive assessment of pulmonary artery pressure (PAP), using measurement of pulmonary artery Doppler derived systolic time intervals, was investigated. Forty pairs of independent ultrasound examinations of the pulmonary artery were performed by a single observer in 20 preterm infants, median gestation 27 weeks (range 24-31 weeks). Median age at study was 17 days (range 1-47 days). paired measurements of acceleration time (AT), ratio between acceleration time and right ventricular ejection time (AT:RVET), corrected AT, and corrected AT:RVET were compared to assess intraobserver agreement. For the corrected AT:RVET ratio, the mean percentage difference between observations was -0.9% (95% confidence intervals -5.0 to 3.1%). The limits of agreement for the two measurements were -26.3 to 24.5%. The coefficient of repeatability was 25.4%. Variation for other indices was similar. Non-invasive assessment of PAP using Doppler derived systolic time intervals is associated with considerable intraobserver variation.<\/jats:p>","DOI":"10.1136\/fn.75.1.f59","type":"journal-article","created":{"date-parts":[[2008,10,31]],"date-time":"2008-10-31T17:55:51Z","timestamp":1225475751000},"page":"F59-F61","source":"Crossref","is-referenced-by-count":14,"title":["Intraobserver variation in Doppler ultrasound assessment of pulmonary artery pressure."],"prefix":"10.1136","volume":"75","author":[{"given":"N V","family":"Subhedar","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"N J","family":"Shaw","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1996,7,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1136\/adc.65.1_Spec_No.24","article-title":"Postnatal circulatory adaptation in healthy term and preterm neonates","volume":"65","author":"Evans, N.J.; Archer, L.N.J.","year":"1990","unstructured":"Evans NJ, Archer LNJ. Postnatal circulatory adaptation in healthy term and preterm neonates. Arch Dis Child 1990;65:24-6.","journal-title":"Arch Dis Child"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"20","DOI":"10.1136\/fn.72.1.F20","article-title":"Raised pulmonary artery pressure in very low birthweight infants requiring supplemental oxygen at 36 weeks after conception","volume":"72","author":"Gill, A.B.; Weindling, A.M.","year":"1995","unstructured":"Gill AB, Weindling AM. Raised pulmonary artery pressure in very low birthweight infants requiring supplemental oxygen at 36 weeks after conception. Arch Dis Child 1995; 72:F20-2.","journal-title":"Arch Dis Child"},{"key":"ref_3","article-title":"Subclinical persisting pulmonary hypertension in chronic neonatal lung disease","author":"Fitzgerald, D.; Evans, N.; Van Asperen, P.; Henderson-Smart, D.","year":"1994","unstructured":"Fitzgerald D, Evans N, Van Asperen P, Henderson-Smart D. 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Noninvasive estimation of right ventricular systolic pressure by Doppler ultrasound in patients with tricuspid regurgitation. Circlation 1984; 70:657-62.","journal-title":"Circlation"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"446","DOI":"10.1016\/S0735-1097(10)80076-2","article-title":"Doppler echocardiographic measurement of pulmonary artery pressure from ductal Doppler velocities in the newbom","volume":"15","author":"Musewe, N.N.; Poppe, D.; Smallhorn, J.F.","year":"1990","unstructured":"Musewe NN, Poppe D, Smallhorn JF, et al. Doppler echocardiographic measurement of pulmonary artery pressure from ductal Doppler velocities in the newbom. 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Arch Dis Child 1991;66:12-16.","journal-title":"Arch Dis Child"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"6","DOI":"10.1136\/adc.66.1_Spec_No.6","article-title":"Doppler assessment of pulmonary artery pressure and extrapulmonary shunting in the acute phase of hyaline membrane disease","volume":"66","author":"Evans, N.J.; Archer, L.N.J.","year":"1991","unstructured":"Evans NJ, Archer LNJ. Doppler assessment of pulmonary artery pressure and extrapulmonary shunting in the acute phase of hyaline membrane disease. 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