1991
DOI: 10.1016/0028-2243(91)90167-j
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Maternal and umbilical cord concentrations of fentanyl after epidural analgesia for cesarean section

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Cited by 32 publications
(17 citation statements)
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“…Equilibrium is reached within 10 to 30 minutes. 4 The drug is also freely transported across the placenta with a slightly higher concentration in the fetal compartment, because of a comparatively acidic pH. 5 Moreover, because of the higher volume of distribution in a steady state, a larger amount of fentanyl is deposited in the fetal peripheral tissues.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Equilibrium is reached within 10 to 30 minutes. 4 The drug is also freely transported across the placenta with a slightly higher concentration in the fetal compartment, because of a comparatively acidic pH. 5 Moreover, because of the higher volume of distribution in a steady state, a larger amount of fentanyl is deposited in the fetal peripheral tissues.…”
Section: Discussionmentioning
confidence: 99%
“…5 mg/kg) during the last 4 hours of labor, may be at greater risk. 4,5,8 None of the trials published to date have an adequate sample size to detect a statistically significant difference for the outcome of respiratory depression in the newborn. 2,3,13 A prospective cohort study with an a error of 0.05 and power of 80% would require approximately 500 subjects in each arm to detect a clinically sizable difference between the groups (calculations done for a desired relative risk of Z2 and for a baseline risk of approximately 3% for respiratory depression at birth in term babies).…”
Section: Discussionmentioning
confidence: 99%
“…More importantly, the work by Desprats et al suggests that even if the UV fentanyl levels are low, there is still a chance of drug accumulation in fetal tissues. 31 This group found that the fetal extraction ratio, the difference between the umbilical vein and artery concentrations, was 53% after fentanyl 100 lg combined with local anaesthetic was given as a single bolus to provide anaesthesia for caesarean delivery. Possible explanations for such a high extraction ratio include rapid fetal metabolism or drug accumulation, with the latter potentially correlating with Beilin et al's findings of breastfeeding problems at 24 hours postpartum.…”
Section: Breastfeedingmentioning
confidence: 98%
“…A área da superfície de intercâmbio materno-fetal estimada é de 67,02 m² e a capilar das vilosidades tem cerca de 50 Alterações fi siológicas na gravidez Durante a gestação, o organismo materno passa por diversas modifi cações, que podem ser adaptativas para melhor suportar a gravidez, ou decorrentes dos elevados níveis de estrógeno e progesterona. A absorção de drogas se altera, pois a motilidade gastrointestinal e a secreção gástrica a fi xed dose of 400 mg presents a high concentration in maternal plasma and a high rate of placental transfer at the time of birth, with the need for caution regarding the use of repeated doses.…”
Section: Mecanismos De Transferência Placentáriaunclassified
“…Os efeitos das altas doses da fentanila estão associados a bradicardia, diminuição do tônus e até mesmo depressão respiratória. Na literatura há relatos de caso de depressão respiratória fetal com doses repetidas em analgesia de trabalho de parto, porém não se conhece bem o nível de toxicidade para o feto 50 . A fentanila passa rapidamente do espaço epidural, área de rica vascularização, para a corrente sangüínea e apresenta curto intervalo de tempo para equilíbrio entre esses setores.…”
Section: Anestésicosunclassified