Abstract
Ultrasound imaging may be the most powerful instrument in the tool chest the reproductive endocrinologist has to improve success rates with assisted reproductive technologies! This modality, improving yearly, permits noninvasive access to view ovarian responses to gonadotropin stimulation. The introduction of transvaginal ultrasound for follicle monitoring during ovulation induction has improved both the safety and success of ART dramatically. Transvaginal ultrasound imaging is thought to be imperative for the safe use of gonadotropins, to optimize treatment, and to avoid potentially life-threatening side effects, such as ovarian hyperstimulation syndrome. Currently the use of 2D ultrasound for assessing follicular development during gonadotropin stimulation for ART is essentially universal. Despite near-ubiquitous use, the 2D ultrasound characteristics of ovarian follicles that reliably predict retrieval of mature and fertilizable oocytes are still being elucidated. We review the development of this 2D ultrasound over the past three decades and review the literature regarding follicle characteristics (size, volume, intrafollicular fluid, and perifollicular vascularization) that correlate with ART success. The follicle characteristics, associated with the use of non-gonadotropin medications for ovulation induction, are also reviewed. We also question current practices and look to the future. Is it really necessary to scan during gonadotropin stimulation as currently practiced, is it associated with better outcomes (higher live-born pregnancy rates), and would it be better if Doppler flow analysis were added to routine protocols? Should follicular monitoring be done by computerized analysis or should each follicle be scanned separately as is currently done by the majority of clinical practices? Our goal is to identify practices and protocols that predict successful outcomes in order to optimize care. With advances in technical engineering, the image quality of 2D ultrasound improves, and the resolution of cellular and subcellular problems, previously not even visualized, is now revealed. One can imagine the next generation of machines, with even clearer images of molecular parameters that will enable further studies that lead to new treatment targets and ultimately greater successes in the management of infertility.
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Abbreviations
- 2D:
-
Two dimensional
- 3D:
-
Three dimensional
- AFC:
-
Antral follicle count
- ART:
-
Assisted reproductive technologies
- CI:
-
Confidence interval
- CL:
-
Corpus luteum
- ET:
-
Embryo transfer
- FI:
-
Flow index
- FSH:
-
Follicle-stimulating hormone
- GnRH:
-
Gonadotropin-releasing hormone
- GV:
-
Germinal vesicle
- hCG:
-
Human chorionic gonadotropin
- ICSI:
-
Intracytoplasmic sperm injection
- IVF:
-
In vitro fertilization
- LH:
-
Luteinizing hormone
- MII:
-
Mature metaphase II
- OHSS:
-
Ovarian hyperstimulation syndrome
- PI:
-
Pulsatility index
- PR:
-
Pregnancy rates
- PSV:
-
Peak systolic velocity
- RI:
-
Resistance index
- S/D:
-
Systole/diastole ratio
- VI:
-
Vascularization index
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Toftager, M., Cohen, D.P. (2014). 2D Ultrasound in Follicle Monitoring for ART. In: Stadtmauer, L., Tur-Kaspa, I. (eds) Ultrasound Imaging in Reproductive Medicine. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9182-8_19
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