| 1. |
- Fellman, Vineta, et al.
(författare)
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One-year survival of extremely preterm infants after active perinatal care in Sweden.
- 2009
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Ingår i: JAMA : the journal of the American Medical Association. - : American Medical Association (AMA). - 1538-3598 .- 0098-7484. ; 301:21, s. 2225-33
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Tidskriftsartikel (refereegranskat)abstract
- Up-to-date information on infant survival after extremely preterm birth is needed for assessing perinatal care services, clinical guidelines, and parental counseling.
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| 2. |
- Källén, Bengt, et al.
(författare)
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In vitro fertilization in Sweden : Maternal characteristics
- 2005
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Ingår i: Acta Obstetricia et Gynecologica Scandinavica. - : Wiley. - 0001-6349 .- 1600-0412. ; 84:12, s. 1185-1191
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Tidskriftsartikel (refereegranskat)abstract
- Background. Deliveries among women who had an in vitro fertilization (IVF) are characterized by increased risks for both the mother and the infant/child. Part of these effects may be due to maternal characteristics. Methods. Using reports from all clinics performing IVF in Sweden, 12 186 women who gave birth after such procedures were identified (13 261 deliveries, 16 280 infants born). Various social and medical characteristics of the women were studied and compared with all women giving birth. Information was retrieved by interviews in early pregnancy or by linkage with various registers. Results. Women who had IVF were older than other women who gave birth and were older after standard IVF than after intracytoplasmatic sperm injection (ICSI). They were more often of first parity and smoked less than other delivered women. There were more women with high body mass index: they worked outside home less often and were more often of Swedish nationality. Women who had standard IVF had more previous miscarriages than expected, but this was not true for women who had ICSI. Their pattern of drug usage differed from that of other women who had given birth. Conclusions. Women who underwent IVF and gave birth showed marked deviations from other women who gave birth. Some of these characteristics may help to explain the increased risks associated with these procedures. Women who had ICSI were less deviating than women who had standard IVF. © Acta Obstet Gynecol Scand 2005.
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| 3. |
- Källén, Bengt, et al.
(författare)
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In vitro fertilization in Sweden : Child morbidity including cancer risk
- 2005
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Ingår i: Fertility and Sterility. - : Elsevier BV. - 0015-0282 .- 1556-5653. ; 84:3, s. 605-610
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To study long-term morbidity among children conceived by IVF. Design: A register study in Sweden of IVF infants compared with all infants born. Setting: National health registers. Patient(s): More than 16,000 children born after IVF (30% of them after intracytoplasmic sperm injection) were studied with national health registers. Main Outcome Measure(s): Total number of days in hospital care at different ages, hospitalization for specific diagnoses, childhood cancer. Result(s): An overuse of hospital care was found among IVF children up to 6 years of age, which was partly explained by maternal characteristics. Discharge diagnoses indicating brain damage (mental retardation, cerebral palsy, epilepsy, behavioral problems) occurred in excess and seemed to be completely explained by preterm births. In addition, other discharge diagnoses were overrepresented, some of them linked to preterm birth. There were 29 children with cancer (21 expected), 5 of them had Langerhan's histiocytosis. Conclusion(s): Long-term morbidity among children conceived by IVF is higher than among naturally conceived infants. This was partly explained by an excess of preterm and multiple births but might also mirror different parental attitudes toward medical care for their children. No general increase in cancer risk was seen, but unexpectedly many children with histiocytosis were noted. ©2005 by American Society for Reproductive Medicine.
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| 4. |
- Källén, Bengt, et al.
(författare)
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In vitro fertilization (IVF) in Sweden : Infant outcome after different IVF fertilization methods
- 2005
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Ingår i: Fertility and Sterility. - : Elsevier BV. - 0015-0282 .- 1556-5653. ; 84:3, s. 611-617
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To compare infant outcome after different IVF techniques. Design: A register study in Sweden of IVF infants compared with all infants born. Setting: National health registers. Patient(s): We studied 16,280 IVF infants, 30% of whom were conceived by intracytoplasmic sperm injection (ICSI). Intervention(s): None. Main Outcome Measure(s): Multiple births, infant sex, preterm birth, low birth weight, and small for gestational age among singletons, mortality, low Apgar score, neonatal diagnoses. Result(s): Twinning was less frequent after frozen standard IVF (18.1%) and after ICSI (21.8%) than after fresh standard IVF (24.4%). The male/female ratio was significantly increased in infants conceived after standard IVF. No significant differences were seen between singleton infants conceived after different IVF methods with respect to preterm birth, low birth weight, or infant mortality, with the possible exception of frozen standard IVF, for which some of these rates were lower than after fresh standard IVF. Infants born after ICSI had an indicated lower risk of respiratory problems than infants born after standard IVF. Conclusion(s): Little difference in outcome was seen after different IVF methods. The differences observed might be due to dissimilar characteristics of the treated women (e.g., because ICSI was mainly used in connection with male infertility). ©2005 by American Society for Reproductive Medicine.
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| 5. |
- Källén, Bengt, et al.
(författare)
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In vitro fertilization (IVF) in Sweden : Risk for congenital malformations after different IVF methods
- 2005
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Ingår i: Birth defects research. Clinical and molecular teratology. - : Wiley. - 1542-0752 .- 1542-0760. ; 73:3, s. 162-169
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: The possible excess of congenital malformations in infants born after in vitro fertilization (IVF) has been much discussed in the literature, with controversial conclusions. This population based study is aimed at analyzing the presence of congenital malformations in a large group of infants born after IVF and to compare malformation risk both with that of all infants born and according to IVF method used. METHODS: Infants born after IVF during the period 1982-2001 were ascertained from all IVF clinics in Sweden. The presence of congenital malformations was identified from three national health registers: the Swedish Medical Birth Register, the Swedish Registry of Congenital Malformations, and the Swedish Hospital Discharge Register. The IVF children were compared with all children born in Sweden during the same period and recorded in the Swedish Medical Birth Register. RESULTS: Among 16,280 IVF children (30% conceived after intracytoplasmatic sperm injection [ICSI]) a 42% excess of any congenital malformation was found, explainable by parental characteristics and in some cases by the high rate of multiple births. Among these children, 8% had a congenital malformation, and 15% had a relatively severe condition. For neural tube defects, choanal atresia, and alimentary tract atresia, an additional risk increase was seen. There was no difference in malformation rate according to IVF method except for an excess of hypospadias after ICSI. CONCLUSIONS: An increased risk for congenital malformations occurs after IVF, similar for the different IVF techniques used, and mainly a consequence of parental characteristics. A few specific conditions show an extra increase in risk. © 2005 Wiley-Liss, Inc.
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