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zoom RSS 家庭分娩での子どもの死亡率は2倍/自宅分娩

<<   作成日時 : 2010/07/02 19:32   >>

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 国際的な研究によれば、家庭分娩では子どもの死亡率が高いという。北米と欧州での50万以上の出産の分析によれば、計画された病院出産に比べ、計画された家庭出産では子どもの死亡率が2倍であった。しかし、危険率は0.2%と低値ではある。
 家庭分娩で合併症を起こしたときには病院に搬送されるため、病院出産としてカウントされてしまうことで、家庭分娩での安全性が今まで誇張されてしまっていた可能性はある。
 家庭分娩の割合は先進国でも様々で、オランダでは1/3だが、米国では約200人に1人である。
 病院で出産する必要がないほど合併症リスクが低いはずだが、家庭分娩での新生児死亡リスクが倍増するというのは驚きである。先天異常を持つ新生児についてみればリスクは3倍だった。
 家庭分娩での死亡の原因は圧倒的に呼吸障害であり、蘇生の失敗である。全体としてみればこれらの問題は超音波・胎児監視装置・誘発分娩・帝王切開など医学的介入により最近数十年で減少している。
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自宅分娩の増加/米国 CDC
http://kurie.at.webry.info/201003/article_4.html
自宅分娩の増加/米国医療事情
http://kurie.at.webry.info/200811/article_27.html
自宅分娩は病院での分娩と同じくらい安全/オランダ
http://kurie.at.webry.info/200904/article_32.html
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Page last updated at 04:09 GMT, Thursday, 1 July 2010 05:09 UK
Home birth risks under scrutiny
http://news.bbc.co.uk/2/hi/health/10465473.stm
By Clare Murphy
Health reporter, BBC News New baby There have been few comprehensive studies into home births

画像Women who plan home births recover more rapidly from childbirth, but there is a higher risk of their child dying, an international study suggests.

US analysis of more than 500,000 births in North America and Europe found death rates for babies in planned home births were double that of those in planned hospital births.
But the risk was still low, at 0.2%.
UK doctors said the evidence needed to be taken into account, but a midwives' body questioned its relevance.
The research, published in the American Journal of Obstetrics and Gynaecology, examined studies on the relative safety of planned home and hospital births from around the world.
Researchers looked at data from nearly 350,000 planned home births and more than 200,000 planned hospital deliveries.
Crucially, it looked at where the woman had planned to give birth, rather than the actual birthplace.
The researchers argued that the safety of home births may have previously been overplayed by the fact that when there are complications and a woman is rushed to hospital, any adverse outcome is recorded as a hospital birth.
Rates of home birth vary across the developed world. In the Netherlands a third of women deliver at home, while in the US around one in 200 women do so.

Fewer interventions
The researchers described their findings of a doubling of the risk of neonatal mortality among those planning home birth as "striking", because it is often those with the lowest risk of complications who do not need to deliver in hospital. When researchers took out babies with congenital abnormalities, the risk was threefold.
When deaths occured among the home birth group, they were overwhelmingly attributed to respiratory problems during birth and failed attempts at rescusitation.
Overall these problems have been decreasing in recent decades, which is thought to be down to greater medical intervention, including more liberal use of ultrasound, electronic fetal heart monitoring, the induction of labour and Caesarean delivery.
Continue reading the main story

The numbers of homebirths are still very low, even in the UK, making meaningful and concrete conclusions about the results difficult
Mervi Jokinen Royal College of Midwives

But the lack of medical intervention may explain why the mothers who planned a home birth tended to end up with fewer tears or lacerations, fewer cases of postpartum haemorrhage and fewer infections.
But the researchers suggested these benefits did come at a cost.
"Women choosing home birth, particularly low-risk individuals who had given birth previously, are in large part successful in achieving their goal of delivering with less morbidity and medical intervention than experienced during hospital-based childbirth," said lead author Dr Joseph Wax from the Department of Obstetrics and Gynaecology at Maine Medical Center.
"Of significant concern, these apparent benefits are associated with a doubling of the neonatal mortality rate overall and a near tripling among infants born without congenital defects."

Robust selection
In the UK, the Royal College of Obstetricians and Gynaecologists said the fact that planned home births resulted in fewer interventions for the mother was something which specialists were already aware of.
"The finding that the consequences for the baby are more severe needs to be carefully considered by women, policy makers and care providers," said its president, Professor Sir Sabaratnam Arulkumaran.
"Certainly, the move towards offering women a choice in their place of birth in the UK needs to be weighed against such evidence."
But, he added, with a robust selection system which ensured high-risk pregnancies were excluded from homebirths and by making sure all midwives providing the services had good rescuscitation skills, risks to the baby could be reduced.
"With the above systems in place and provided women receive one-to-one midwifery care, planned home births for low-risk women are a viable option," said Prof Arulkumaran.
"However, birth can be unpredictable and these women should also have quick access to obstetric care if and when an emergency occurs."
Mervi Jokinen of the Royal College of Midwives, said the study was interesing, but questioned the validity of its findings for the UK.
"Comparison of the results is difficult because the study's authors are working with data collected differently in many countries.
"Here we have services delivered by midwives who are skilled and experienced at home births and resuscitating newborns.
"This is perhaps in contrast to many of the other countries this research covers."
A study is currently being carried out to establish the relative risks of home and hospital births in the UK.
The rates are low, with just under 3% of deliveries taking place at home, according to the most recent figures from the Office of National Statistics for England and Wales.
Mary Newburn of the National Childbirth Trust said the American study was an important one "that needs reviewing".
"NCT's own detailed review of home birth concluded that, although the quality of comparative evidence on safety of home birth is poor, there is no evidence that for women with a low risk of complications the likelihood of a baby dying during or shortly after labour is any higher if they plan for a home birth compared with planning a hospital birth."
A Department of Health spokesperson said:
"It is important for all women to be able to give birth in a safe, high quality environment that is best suited for them.
"In England, midwives discuss the various birth options available for mothers and any associated risks to help them make an informed choice.
"We have commissioned research that is comparing births planned at home, in birthing centres and in hospital. This report is expected to be published next year and we will look at the findings carefully."

----------------------------------------------------
Time for improved standards for studies of home birth .
In Press Corrected Proof , Available online 28 June 2010
Patricia Alice Janssen, Michael C. Klein
American Journal of Obstetrics & Gynecology
DOI: 10.1016/j.ajog.2010.04.042

----------------------------------------------------
Volume 201, Issue 6, Supplement, Page S49 (December 2009)

Maternal and newborn outcomes in planned home versus planned hospital birth―a metaanalysis

Joseph Wax1, F. Lee Lucas2, Michael Pinette1, Angelina Cartin1, Jacquelyn Blackstone1

To systematically review the medical literature on the maternal and newborn safety of planned home versus planned hospital birth.

Study Design

We searched MEDLINE, EMBASE, and the Cochrane Database of Systematic Reviews for English-language peer-reviewed publications from developed Western nations reporting maternal and newborn outcomes by planned delivery location. Outcomes′ summary odds ratios (OR) with 95% confidence intervals (CI) were calculated and tested for homogeneity. When present, a fixed effects model was used and when absent, a random effects model was employed.

Results

The nine included studies contained 11, 158 planned home and 27, 515 planned hospital deliveries. Planned home births were associated with fewer maternal interventions including intrapartum analgesia (OR 0.43; 95% CI 0.39-0.48), episiotomy (OR 0.34; 0.31-0.38), operative vaginal delivery (OR 0.31; 0.28-0.35), and cesarean delivery (OR 0.27; 0.24-0.31). Additionally, women planning home births were less likely to experience ?3° lacerations (OR 0.48; 0.34-0.69), vaginal lacerations (OR 0.48; 0.40-0.57), infections (OR 0.32; 0.18-0.57), and retained placentas (OR 0.59; 0.40-0.86). Outcomes among offspring of planned home births revealed less frequent prematurity (OR 0.08; 0.06-0.10), low birth weight (OR 0.58; 0.48-0.71), assisted newborn ventilation (OR 0.71; 0.53-0.95), and postdates (OR 0.25; 0.19-0.33). In contrast, planned home births exhibited significantly elevated neonatal mortality rates, overall (OR 2.09; 1.20-3.63) and among nonanomalous fetuses (OR 2.82; 1.16-6.86). There were no significant differences by planned delivery location for perineal lacerations, postpartum hemorrhage, cord prolapse and perinatal mortality.

Conclusion

The decreased medical intervention and morbidity associated with planned home birth must be weighed against a doubling of the neonatal mortality rate.

1 Maine Medical Center, Division of Maternal-Fetal Medicine, Portland, Maine

2 Maine Medical Center, Maine Center for Outcomes Research and Evaluation, Portland, Maine

PII: S0002-9378(09)01215-0

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