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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
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The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
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Major or minor placenta previa: Does it make a difference?

Maiju Grönvall1, Vedran Stefanovic1, Jorma Paavonen1

  • 1Department of Obstetrics and Gynecology, Helsinki University Hospital, Finland.

Placenta
|August 18, 2019
PubMed
Summary
This summary is machine-generated.

Placenta previa screening missed 18.2% of cases, particularly minor placenta previa. Both major and minor placenta previa increase risks for abnormally invasive placenta, requiring careful management.

Keywords:
Abnormally invasive placentaMajor placenta previaMid-pregnancy ultrasound screeningMinor placenta previaPlacenta previaPostpartum hemorrhage

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Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Diagnostic Imaging

Background:

  • Placenta previa is a significant pregnancy complication associated with maternal and neonatal morbidity.
  • Management strategies for minor placenta previa remain less defined compared to major placenta previa.
  • Accurate and timely diagnosis of placenta previa is crucial for optimal patient outcomes.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of the existing antenatal ultrasound screening protocol for placenta previa.
  • To compare pregnancy and delivery outcomes between women with major and minor placenta previa.

Main Methods:

  • Retrospective analysis of data from 176 women diagnosed with placenta previa at delivery.
  • Study conducted at Helsinki University Hospital between June 2010 and September 2014.
  • Inclusion of all women with antenatal ultrasound diagnosis of placenta previa.

Main Results:

  • The screening protocol missed 18.2% of placenta previa cases, with minor placenta previa being more frequently undiagnosed (62.5% of missed cases).
  • Undiagnosed cases of placenta previa were associated with life-threatening hemorrhage (15.6%) and abnormally invasive placenta requiring hysterectomy.
  • Major placenta previa was linked to increased blood loss and earlier delivery compared to minor placenta previa.

Conclusions:

  • The current screening protocol for placenta previa demonstrates suboptimal accuracy, missing a substantial proportion of cases.
  • Both major and minor placenta previa are identified as risk factors for abnormally invasive placenta.
  • All cases of placenta previa, regardless of type, should be considered severe conditions requiring vigilant management.