Browsing by Subject "in vitro fertilization"

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  • Ervaala, Attina (Helsingin yliopisto, 2021)
    Pre-eklampsia on globaali ongelma, mikä komplisoi 2–8 % raskauksista. Pre-eklampsiassa normaalisti sikiötä äidin immuunipuolustukselta suojaavien tekijöiden säätely on häiriintynyt. Tutkimuksen tarkoituksena oli selvittää pre-eklampsian riskiä ja luonnetta luovutetuilla sukusoluilla saavutetuissa raskauksissa. Koska luovutetut sukusolut eroavat immunologisesti normaalia enemmän kantajastaan, hypoteesiksi asetettiin, että näissä raskauksissa pre-eklampsiaa esiintyy enemmän. Myös kirjallisuuden mukaan näissä raskauksissa vaikuttaisi olevan pre-eklampsiaa enemmän (38–20 %). Aineistona oli Finnish Genetics of Preeclampsia Consortium (FINNPEC) kohortti (n=2778). Tässä pre-eklampsia määriteltiin seuraavasti: 1. yli 140 mmHg:n systolinen verenpaine sekä 2. proteinuria (virtsan proteiini ≥0·3 g/24 h tai 0·3 g/L tai kaksi ≥1+ tulosta liuskatestissä) ja 3. näiden ilmeneminen H20 jälkeen. Näillä kriteereillä verrattiin luovutetuilla sukusoluilla saavutettuja raskauksia (n=21) muihin raskauksiin (n=2757). Väestötason esiintyvyys pre-eklampsian suhteen saatiin terveyden ja hyvinvoinnin laitoksen syntyneiden lasten rekisteristä. Tutkimuksen tuloksena todettiin pre-eklampsiaa esiintyvän enemmän luovutetuilla sukusoluilla saavutetuissa raskauksissa. Muita riskitekijöitä olivat muun muassa äidin korkeampi ikä ja sikiön miessukupuoli. Pre-eklampsiaraskauksia vertailtaessa luovutetuilla sukusoluilla saavutetuissa raskauksissa esiintyi enemmän ennenaikaisia synnytyksiä, ja pre-eklampsia diagnosoitiin aiemmin kuin muissa raskauksissa. Luovutettujen sukusolujen raskauksista ei löydetty tilastollisesti merkittäviä eroja raskauksien luonteissa luovutettujen siittiöiden ja munasolujen välillä, mutta näyttäisi siltä, että riskit ovat isommat luovutetuilla munasoluilla alkaneissa raskauksissa. Tulokset tukevat aikaisempia tutkimustuloksia, vaikka otanta olikin pieni. Tilastollisten merkitsevien erojen puuttumisesta huolimatta tutkimus mahdollisti lisätiedon saamisen sikiön sukupuolen ja vieraiden antigeenien merkityksestä.
  • Petersen., Sindre H.; Bergh, Christina; Gissler, Mika; Åsvold, Bjørn O.; Romundstad, Liv B.; Tiitinen, Aila; Spangmose, Anne L.; Pinborg, Anja; Wennerholm, Ulla-Britt; Henningsen, Anna-Karina A.; Opdahl, Signe (2020)
    Background The use of assisted reproductive technology (ART) is increasing worldwide and conception after assisted reproduction currently comprises 3-6% of birth cohorts in the Nordic countries. The risk of placenta-mediated pregnancy complications is higher after ART compared to spontaneously conceived pregnancies. Whether the excess risk of placenta-mediated pregnancy complications in pregnancies following assisted reproduction has changed over time, is unknown. Objectives To investigate whether time trends in risk of pregnancy complications (hypertensive disorders in pregnancy, placental abruption and placenta previa) differ for pregnancies after ART compared to spontaneously conceived pregnancies during three decades of assisted reproduction treatment in the Nordic countries. Study Design In a population-based cohort study, with data from national health registries in Denmark (1994-2014), Finland (1990-2014), Norway (1988-2015) and Sweden (1988-2015), we included 6,830,578 pregnancies resulting in delivery. Among these, 146,998 (2.2%) were pregnancies after assisted reproduction (125,708 singleton pregnancies, 20,668 twin pregnancies and 622 of higher order plurality) and 6,683,132 (97.8%) pregnancies were conceived spontaneously (6,595,185 singleton pregnancies, 87,106 twin pregnancies and 1,289 of higher order plurality). We used logistic regression with post-estimation to estimate absolute risks and risk differences for each complication. We repeated analyses for singleton and twin pregnancies, separately. In sub-samples with available information, we also adjusted for maternal body mass index, smoking during pregnancy, previous cesarean section, culture duration and cryopreservation. Results The risk of each placental complication was consistently higher in pregnancies following ART compared to spontaneously conceived pregnancies across the study period, except for hypertensive disorders in twin pregnancies, where risks were similar. Risk of hypertensive disorders increased over time in twin pregnancies for both conception methods, but more strongly for pregnancies following ART (risk difference 1.73 percentage points per 5 years, 95% confidence interval 1.35 to 2.11) than for spontaneously conceived twins (risk difference 0.75 percentage points, 95% confidence interval 0.61 to 0.89). No clear time trends were found for hypertensive disorders in singleton pregnancies. Risk of placental abruption decreased over time in all groups (risk difference -0.16 percentage points, 95% confidence interval -0.19 to -0.12 and -0.06 percentage points, 95% confidence interval -0.06 to -0.05 for pregnancies after assisted reproduction and spontaneously conceived pregnancies, respectively, for singletons and multiple pregnancies combined). Over time, the risk of placenta previa increased in pregnancies after assisted reproduction among both singletons (risk difference 0.21 percentage points, 95% confidence interval 0.14 to 0.27) and twins (risk difference 0.30 percentage points, 95% confidence interval 0.16 to 0.43), but remained stable in spontaneously conceived pregnancies. When adjusting for culture duration, the temporal increase in placenta previa became weaker in all groups of ART pregnancies, whereas adjustment for cryopreservation moderately attenuated trends in ART twin pregnancies. Conclusions The risk of placenta-mediated pregnancy complications following ART remains higher compared to spontaneously conceived pregnancies, despite declining rates of multiple pregnancies. For hypertensive disorders in pregnancy and placental abruption, pregnancies after assisted reproduction follow the same time trends as the background population, whereas for placenta previa, risk has increased over time in pregnancies after ART.