How much have we learned from time-lapse in clinical IVF?

Area of Science:

• Reproductive Medicine
• Embryology
• Biotechnology

Background:

• Time-lapse systems (TLS) are increasingly used in assisted reproductive technology (ART) for embryo evaluation.
• Existing research on TLS effectiveness for embryo selection shows mixed results.
• Variability in study populations and methodologies complicates comparisons between TLS and conventional incubation.

Purpose of the Study:

• To review and synthesize current evidence on the efficacy of TLS for embryo incubation and selection.
• To compare the outcomes of TLS with conventional embryo culture methods.
• To identify research gaps regarding TLS and key reproductive endpoints.

Main Methods:

• A comprehensive literature search of PubMed was conducted.
• Studies focusing on TLS in embryo incubation and selection were retrieved.
• Evidence was analyzed to compare TLS with standard embryo culture and evaluation techniques.

Main Results:

• While TLS offers novel insights into embryo development kinetics, conclusive evidence supporting its superiority over conventional methods is limited.
• Many studies focus on intermediate endpoints like blastocyst formation, with less data on live birth rates, miscarriage, or stillbirth.
• Significant heterogeneity exists in study designs, patient demographics, and culture conditions, impacting result interpretation.

Conclusions:

• Further high-quality research is necessary to establish the definitive benefits of TLS for embryo selection.
• Comprehensive data on live birth rates, twinning, and infant health are crucial for clinical decision-making.
• Standardization of study protocols and reporting is needed to improve evidence quality in TLS research.