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Hypoxia

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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
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There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...

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Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
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Regulation of Angiogenesis and Blood Supply

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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

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Human respiratory syncytial virus (RSV) is a widespread pathogen that primarily targets infants and young children but also poses a serious health risk to elderly and immunocompromised individuals. Belonging to the Pneumoviridae family, RSV is a negative-sense, single-stranded RNA virus within the Pneumovirus genus. Its global health burden is significant, with millions of cases annually resulting in hospitalizations and mortality, particularly in resource-limited settings. Although most...

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Related Experiment Video

Updated: Jun 15, 2026

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice

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Published on: July 11, 2025

[Meconiophages and fetal hypoxia].

D Staribratova, V Belovezhdov, I Batashki

Akusherstvo I Ginekologiia

|March 5, 2010

Summary

Meconium passage in fetuses is normal after 40 weeks. However, meconium in preterm fetuses or before labor may indicate fetal distress, identifiable through histopathology.

Area of Science:

Perinatal medicine
Fetal pathology
Histopathology

Context:

Meconium passage is a common event in term fetuses during labor.
The timing and context of meconium passage are critical for interpretation.
Meconium in preterm fetuses or prior to labor can suggest fetal distress.

Purpose:

To differentiate normal meconium passage from potential indicators of fetal distress.
To explore the utility of histopathology in assessing meconium passage duration.
To evaluate the diagnostic value of meconium-laden macrophages in placental membranes.

Summary:

Meconium passage is typically normal in term fetuses post-40 weeks gestation.
Meconium presence in preterm fetuses or before labor may signify fetal distress.

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Biochemical Measurement of Neonatal Hypoxia

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Last Updated: Jun 15, 2026

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice

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Published on: July 11, 2025

Biochemical Measurement of Neonatal Hypoxia

Biochemical Measurement of Neonatal Hypoxia

Published on: August 24, 2011

Induction of Hypoxia in Living Frog and Zebrafish Embryos

Induction of Hypoxia in Living Frog and Zebrafish Embryos

Published on: June 26, 2017

Histopathological examination of placental membranes, specifically identifying meconium-laden macrophages, aids in estimating the duration of meconium exposure.

Impact:

Provides clearer diagnostic criteria for interpreting meconium passage during pregnancy.
Enhances the understanding of fetal well-being indicators.
Offers a method for retrospective assessment of fetal distress through placental examination.