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Ovarian Cycle01:27

Ovarian Cycle

The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...
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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...

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Related Experiment Video

Updated: Jun 4, 2026

Heterotopic Heart Transplantation in Mice
23:43

Heterotopic Heart Transplantation in Mice

Published on: July 19, 2007

Heterotopic pregnancy.

K Talbot1, R Simpson, N Price

  • 1The John Radcliffe Hospital, Oxford, UK. katherinetalbot@doctors.org.uk

Journal of Obstetrics and Gynaecology : the Journal of the Institute of Obstetrics and Gynaecology
|February 2, 2011
PubMed
Summary
This summary is machine-generated.

Heterotopic pregnancy, a dangerous condition, often presents with risk factors. Diagnosis remains complex, as even normal ultrasound findings can be misleading, underscoring the need to consider ectopic pregnancy.

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Area of Science:

  • Reproductive Medicine
  • Diagnostic Imaging
  • Obstetrics & Gynecology

Background:

  • Heterotopic pregnancy is a rare but life-threatening condition.
  • A systematic literature review (2005-2010) was conducted following a recent case.

Observation:

  • Risk factors for heterotopic pregnancy were present in 71% of reviewed cases.
  • A significant percentage (33%) of cases received false reassurance from prior normal intrauterine pregnancy ultrasound reports.

Findings:

  • Ultrasound plays an increasingly crucial role in diagnosing heterotopic pregnancy.
  • Conservative management strategies for heterotopic pregnancy have evolved.
  • Comparison with historical data (1971-2004) reveals trends in diagnosis and management.

Implications:

  • The diagnostic complexity of heterotopic pregnancy necessitates vigilance.
  • The dictum 'think ectopic' remains critical, even with a confirmed intrauterine pregnancy.
  • Advances in medical knowledge and technology aid diagnosis and management but do not eliminate diagnostic challenges.