IVF success rates may be boosted by time lapse embryo imaging
Time lapse imaging- which takes thousands of pictures of developing embryos can boost the success rate of IVF, according to British research.The article Retrospective analysis of outcomes after IVF using an aneuploidy risk model derived from time-lapse imaging without PGS was reported in Reproductive BioMedicine Online, can be used to select embryos at low risk of defects.
Scientists at the CARE fertility group say such informed selection can improve birth rates by 56%.
Other experts say the result is exciting, but the study of 69 couples is too small to be definitive.
The research followed the couples at the CARE fertility clinic in Manchester last year, when 88 embryos were imaged and implanted.
The process involves putting the embryos into an incubator and imaged them every 10 to 20 minutes.
Continual embryo monitoring through time-lapse imaging is aimed at selecting those with the lowest risk of aneuploidy – where the cells have chromosome abnormalities. Aneuploidy is the single biggest cause of IVF failure.
But this form of embryo screening is a predictive rather than diagnostic tool.
Couples at high risk of passing on a chromosomal abnormality may prefer to have Pre-implantation Genetic Screening. This invasive test removes cells from the early embryo for analysis. It costs around £2,500 on top of the £3,000 charged for conventional IVF.
The researchers classified the embryos as low, medium or high risk of chromosome abnormalities based on their development at certain key points.
Eleven babies were born from the low risk group (61% success rate) compared to five from the medium risk group (19% success rate) and none from those deemed high risk.
“In the 35 years I have been in this field this is probably the most exciting and significant development that can be of value to all patients seeking IVF,” said Prof Simon Fishel, managing director of CARE Fertility Group.
“This technology can tell us which embryo is the most viable and has the highest potential to deliver a live birth – it will have huge potential. This is almost like having the embryo in the womb with a camera on them.”
In standard IVF, embryos are removed from the incubator once a day to be checked under the microscope. This means they briefly leave their temperature-controlled environment and single daily snapshots of their development are possible.