{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T13:22:51Z","timestamp":1765286571261,"version":"3.46.0"},"reference-count":0,"publisher":"BMJ","issue":"5774","license":[{"start":{"date-parts":[[1971,9,4]],"date-time":"1971-09-04T00:00:00Z","timestamp":52790400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.bmj.com\/company\/legal-information\/terms-conditions\/legal-information\/tdm-licencepolicy"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br Med J"],"published-print":{"date-parts":[[1971,9,4]]},"abstract":"<jats:p>The second stage of labour is associated with relative fetal hypoxia and progressive metabolic acidosis. Maternal analgesia can increase the danger, especially for the high-risk fetus.<\/jats:p>\n                  <jats:p>\n                    In 152 patients the effect on the fetus of pethidine alone, pethidine + trichloroethylene, or pethidine + Entonox was assessed by fetal scalp blood sampling. Fetal pH, Pco\n                    <jats:sub>2<\/jats:sub>\n                    , and Po\n                    <jats:sub>2<\/jats:sub>\n                    were measured and base excess was calculated. Capillary samples were also taken 45 to 60 minutes after birth in 88 of the babies to estimate the rate of neonatal recovery.\n                  <\/jats:p>\n                  <jats:p>\n                    Entonox proved safer than trichloroethylene, and babies treated with it maintained their Po\n                    <jats:sub>2<\/jats:sub>\n                    before birth, had better Apgar scores at birth, and one hour later were significantly less acidotic and much better oxygenated.\n                  <\/jats:p>","DOI":"10.1136\/bmj.3.5774.558","type":"journal-article","created":{"date-parts":[[2009,4,8]],"date-time":"2009-04-08T15:21:07Z","timestamp":1239204067000},"page":"558-560","source":"Crossref","is-referenced-by-count":9,"title":["Comparative Effect of Pethidine, Trichloroethylene, and Entonox on Fetal and Neonatal Acid-Base and Po\n                    <sub>2<\/sub>"],"prefix":"10.1136","volume":"3","author":[{"given":"T. J.","family":"Phillips","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R. R.","family":"Macdonald","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1971,9,4]]},"container-title":["BMJ"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/data.bmj.org\/tdm\/10.1136\/bmj.3.5774.558","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bmj.3.5774.558","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T13:16:36Z","timestamp":1765286196000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.bmj.com\/lookup\/doi\/10.1136\/bmj.3.5774.558"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1971,9,4]]},"references-count":0,"journal-issue":{"issue":"5774","published-online":{"date-parts":[[1971,9,4]]},"published-print":{"date-parts":[[1971,9,4]]}},"alternative-id":["10.1136\/bmj.3.5774.558"],"URL":"https:\/\/doi.org\/10.1136\/bmj.3.5774.558","relation":{},"ISSN":["0007-1447","1468-5833"],"issn-type":[{"type":"print","value":"0007-1447"},{"type":"electronic","value":"1468-5833"}],"subject":[],"published":{"date-parts":[[1971,9,4]]}}}