Human oocyte respiration-rate measurement – potential to improve oocyte and embryo selection?

Scott, Lynette; Berntsen, Jørgen; Davies, D.W.; Gundersen, Jens Kristïan; Hill, Joseph A.; Ramsing, Niels B.

doi:10.1016/s1472-6483(10)60232-5

Cited by 62 publications

(33 citation statements)

References 23 publications

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“…Several methods, both invasive and non-invasive, are under investigation i.e. aneuploidy screening (PGS), O 2 respiration measurement, metabolic profiling and gene expression analysis [1,3,17,22,29,35,37]. Some of these methods, though promising, are not yet applicable in a routine clinical setting, and others, such as PGS and near infrared spectroscopy (NIR) analysis have been disappointing in their present form, when evaluated in large randomized clinical trials [10,11,22,34,38].…”

Section: Discussionmentioning

confidence: 99%

A randomized clinical trial comparing embryo culture in a conventional incubator with a time-lapse incubator

Kirkegaard

Hindkjær

Grøndahl

et al. 2012

J Assist Reprod Genet

128

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Purpose Time-lapse monitoring allows for a flexible embryo evaluation and potentially provides new dynamic markers of embryo competence. Before introducing timelapse monitoring in a clinical setting, the safety of the instrument must be properly documented. Accordingly, the aim of this study was to evaluate the safety of a commercially available time-lapse incubator. Methods In a two center, randomized, controlled, clinical trial 676 oocytes from 59 patients in their 2nd or third treatment cycle, age <38 years and ≥8 oocytes retrieved were cultured in the time-lapse incubator or in a conventional incubator. The primary outcome was proportion of 4-cell embryos on day 2. Secondary outcomes were proportion of 7-8 cell embryos on day 3 and proportion of blastocysts on day 5. Implantation pregnancy rates were registered based on presence of fetal heart activity visualized by ultrasound 8 weeks after embryo transfer. Results No significant difference was found between the time-lapse incubator (TLI) and conventional incubator (COI) in proportion of 4-cell embryos on day 2 irrespective of whether data was analyzed according to ITT (RR TLI/COI : 0.81 (0.65; 1.02)) or PP (RR TLI/COI : 0.80 (0.63; 1.01)). Nor were any significant differences detected in the secondary endpoints; i.e. proportion of 7-8-cell embryos on day three ITT (RR TLI/COI : 0.96 (0.73; 1.26)); PP (RR TLI/COI : 0.95 (0.72; 1.26)) and proportion of blastocysts on day five ITT (RR TLI/COI : 1.09 (0.84; 1.41)); PP (RR TLI/COI : 1.09 (0.83: 1.41)). We found no differences in clinical pregnancy rate or implantation rate. Conclusion Culture in the time-lapse incubator supports embryonic development equally to a conventional incubator.

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Section: Discussionmentioning

confidence: 99%

A randomized clinical trial comparing embryo culture in a conventional incubator with a time-lapse incubator

Kirkegaard

Hindkjær

Grøndahl

et al. 2012

J Assist Reprod Genet

128

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show abstract

“…At the time of writing, there is no consensus on the relationship between oxygen consumption and pregnancy potential. For example, findings for human oocytes were reported by Scott et al (2008) which indicated that respiration rates neither too high nor too low were consistent with oocyte viability while Tejera et al (2011) found that human oocytes that generated embryos which implanted had a slightly higher oxygen consumption than those which failed to implant. Ottosen et al (2007) and Sugimura et al (2010) both found that cleavage stage, mouse, and pig embryos respectively with higher oxygen consumption were more likely to reach the blastocyst stage while the data of Lopes et al (2007), given below (Fig.…”

Section: The Quiet Embryo Hypothesismentioning

confidence: 96%

Metabolism of the preimplantation embryo: 40 years on

Leese¹

2012

Reproduction

299

201

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This review considers how our understanding of preimplantation embryo metabolism has progressed since the pioneering work on this topic in the late 1960s and early 1970s. Research has been stimulated by a desire to understand how metabolic events contribute to the development of the zygote into the blastocyst, the need for biomarkers of embryo health with which to improve the success of assisted conception technologies, and latterly by the ‘Developmental Origins of Health and Disease’ (DOHaD) concept. However, arguably, progress has not been as great as it might have been due to methodological difficulties in working with tiny amounts of tissue and the low priority assigned to fundamental research on fertility and infertility, with developments driven more by technical than scientific advances. Nevertheless, considerable progress has been made in defining the roles of the traditional nutrients: pyruvate, glucose, lactate, and amino acids; originally considered as energy sources and biosynthetic precursors, but now recognized as having multiple, overlapping functions. Other nutrients; notably lipids, are beginning to attract the attention they deserve. The pivotal role of mitochondria in early embryo development and the DOHaD concept, and in providing a cellular focus for metabolic events is now recognized. Some unifying ideas are discussed; namely ‘stress–response models’ and the ‘quiet embryo hypothesis’; the latter aiming to relate the metabolism of individual preimplantation embryos to their subsequent viability. The review concludes by updating the state of knowledge of preimplantation embryo metabolism in the early 1970s and listing some future research questions.

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“…This method is subjective because evaluations are based on the number of blastomeres in the embryo, symmetry of the blastomeres and degree of fragmentation [8,9]. Morphological assessment does not detect chromosomal abnormality or defects in critical cellular processes like protein synthesis, transcription and metabolism that can impact on viability of an embryo.…”

Section: Figurementioning

confidence: 99%

Selecting a Single Embryo for Transfer after In-vitro Fertilization: A Translational Medicine Perspective

Faduola¹

2015

Transl Biomed

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Human oocyte respiration-rate measurement – potential to improve oocyte and embryo selection?

Cited by 62 publications

References 23 publications

A randomized clinical trial comparing embryo culture in a conventional incubator with a time-lapse incubator

A randomized clinical trial comparing embryo culture in a conventional incubator with a time-lapse incubator

Metabolism of the preimplantation embryo: 40 years on

Selecting a Single Embryo for Transfer after In-vitro Fertilization: A Translational Medicine Perspective

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