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Related Experiment Videos

Gadodiamide administration causes spurious hypocalcemia.

Martin R Prince1, Hale E Erel, Richard W Lent

  • 1Department of Radiology, Weill Medical College of Cornell University, 416 E 55th St, New York, NY 10021, USA. map2008@med.cornell.edu

Radiology
|May 30, 2003
PubMed
Summary

Gadodiamide-enhanced MR imaging can cause falsely low calcium levels, especially in patients with kidney problems or at higher doses. This spurious hypocalcemia may lead to unnecessary treatments, though no harm was observed in this study.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Clinical Chemistry

Background:

  • Gadolinium-based contrast agents are widely used in Magnetic Resonance (MR) imaging.
  • Gadodiamide is a commonly used gadolinium-based contrast agent.
  • Spurious laboratory test results can lead to inappropriate patient management.

Purpose of the Study:

  • To determine the frequency of falsely low serum calcium measurements following gadodiamide-enhanced MR imaging.
  • To identify factors influencing spurious hypocalcemia after gadodiamide administration.

Main Methods:

  • Retrospective analysis of 1,049 MR imaging examinations in 896 inpatients with pre- and post-contrast serum calcium data.
  • Correlation of serum calcium changes with gadodiamide dose, renal function (serum creatinine), and timing of phlebotomy.

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Main Results:

  • Spurious hypocalcemia (decrease > 2 mg/dL) occurred in 42 examinations, with 25 resulting in critical hypocalcemia reports (< 6 mg/dL).
  • Reduced calcium levels correlated significantly with serum creatinine, gadodiamide dose, and time to phlebotomy.
  • Patients with renal insufficiency and those receiving higher gadodiamide doses (> 0.2 mmol/kg) experienced greater spurious calcium reductions.
  • Spurious hypocalcemia persisted for up to 4.5 days in patients with renal insufficiency.
  • Seven patients received unnecessary intravenous calcium, and eleven received oral calcium supplementation.

Conclusions:

  • Gadodiamide administration is associated with spurious hypocalcemia.
  • The risk of spurious hypocalcemia is elevated with higher gadodiamide doses and in patients with impaired renal function.
  • Awareness of this phenomenon is crucial to prevent misdiagnosis and inappropriate treatment.