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Related Experiment Videos

Contrast media adversely affect oxyhemoglobin dissociation.

S J Kim1, M R Salem, N J Joseph

  • 1Department of Anesthesiology, Illinois Masonic Medical Center, Chicago 60657.

Anesthesia and Analgesia
|July 1, 1990
PubMed
Summary
This summary is machine-generated.

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Ionic and nonionic contrast media significantly decrease P50 values, indicating increased hemoglobin-oxygen affinity. This effect may impair oxygen delivery to tissues, impacting patients receiving contrast media.

Area of Science:

  • Medical Imaging
  • Hematology
  • Physiology

Background:

  • Contrast media are widely used in medical imaging.
  • Understanding their physiological effects is crucial for patient safety.
  • Oxyhemoglobin dissociation is a key determinant of oxygen delivery.

Purpose of the Study:

  • To evaluate the impact of ionic and nonionic contrast media on human red blood cell oxyhemoglobin dissociation.
  • To determine if contrast media affect the Bohr effect.

Main Methods:

  • In vitro addition of contrast media (Hypaque-76, Isovue-370, Omnipaque-350) to volunteer blood samples.
  • Measurement of P50 (partial pressure of oxygen at 50% hemoglobin saturation) at different pH levels (7.4 and 7.2).
  • In vivo sampling during contrast media injection in patients undergoing angiography.

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Main Results:

  • Contrast media significantly decreased P50 values at pH 7.4, indicating increased hemoglobin-oxygen affinity.
  • The Bohr effect (pH-dependent shift in P50) was abolished or markedly attenuated by contrast media.
  • In vivo findings corroborated in vitro results.

Conclusions:

  • Both ionic and nonionic contrast media enhance hemoglobin's affinity for oxygen.
  • This enhanced affinity may lead to reduced oxygen delivery to tissues.
  • Clinical implications for oxygen transport in patients receiving contrast media warrant consideration.