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Physiological Control of Respiration01:23

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Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Related Experiment Video

Updated: Apr 21, 2026

Preoxygenation Techniques for Tracheal Intubation in Critically Ill Adults Utilizing Oxygen Mask and Noninvasive Ventilation
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Oxygen targeting in preterm infants: a physiological interpretation.

S Lakshminrusimha1, V Manja2, B Mathew1

  • 1Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Women and Children's Hospital of Buffalo and University at Buffalo, Buffalo, NY, USA.

Journal of Perinatology : Official Journal of the California Perinatal Association
|October 31, 2014
PubMed
Summary
This summary is machine-generated.

Determining optimal oxygen saturation targets for extremely preterm infants remains uncertain. Studies comparing low vs. high targets yielded variable results, highlighting the need for further research into precise oxygenation strategies.

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Area of Science:

  • Neonatalogy
  • Pediatric Critical Care
  • Respiratory Physiology

Background:

  • Randomized trials comparing low (85-89%) versus high (91-95%) target oxygen saturation (SpO2) in extremely preterm infants show inconsistent outcomes for mortality and morbidity.
  • Variability in pulse oximeter accuracy, probe placement, and the complex relationship between SpO2, SaO2, and PaO2 may have led to non-distinct comparison groups.

Purpose of the Study:

  • To evaluate the effectiveness of different target oxygen saturation ranges in extremely preterm infants.
  • To address the persistent uncertainty regarding the optimal SpO2 target range for this vulnerable population.

Main Methods:

  • Analysis of randomized controlled trials comparing low-target SpO2 (85-89%) with high-target SpO2 (91-95%).
  • Consideration of methodological limitations including pulse oximetry inaccuracies and physiological differences in oxygen transport.

Main Results:

  • Despite methodological challenges leading to overlapping SpO2 ranges, some studies reported significant differences in mortality, necrotizing enterocolitis, and severe retinopathy of prematurity.
  • Observed differences may be linked to the duration infants spent outside target ranges (SpO2 <85% or >95%).

Conclusions:

  • Significant uncertainty remains regarding the ideal SpO2 target range for extremely preterm infants.
  • Further research is warranted, focusing on novel oxygenation assessment methods and strategies to minimize both hypoxemia (<85% SpO2) and hyperoxemia (>95% SpO2).
  • An intermediate, wider target range (87-93%) might mitigate some observed adverse outcomes.