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Cardiac pH-Imaging With Hyperpolarized MRI.

Nikolaj Bøgh1, Esben Søvsø Szocska Hansen1, Christian Østergaard Mariager1

  • 1The MR Research Center, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.

Frontiers in Cardiovascular Medicine
|November 27, 2020
PubMed
Summary
This summary is machine-generated.

New magnetic resonance imaging techniques allow for in-vivo pH mapping in the heart, aiding cardiac disease diagnosis. Hyperpolarized 13C-substrates show promise for myocardial pH assessment in clinical trials.

Keywords:
acid-basehearthyperpolarizationmagnetic resonance imagingmyocardiumpH

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Area of Science:

  • Cardiovascular Medicine
  • Biomedical Imaging
  • Metabolic Imaging

Background:

  • Acid-base disturbances are critical in cardiac disease, yet direct cardiac pH measurement is clinically unavailable.
  • Existing diagnostic methods lack the ability to assess myocardial pH non-invasively.
  • Emerging magnetic resonance imaging (MRI) techniques offer potential for in-vivo cardiac pH mapping.

Purpose of the Study:

  • To review emerging MRI techniques for in-vivo cardiac pH detection.
  • To highlight magnetic resonance spectroscopy and imaging with hyperpolarized 13C-substrates as key biomarkers for myocardial pH.
  • To discuss the translational potential of these techniques in cardiovascular medicine.

Main Methods:

  • Overview of advanced MRI techniques, focusing on hyperpolarized 13C-spectroscopy and imaging.
  • Utilizing hyperpolarized 13C-substrates (e.g., [1-13C]pyruvate, 13C-bicarbonate) to probe pH-sensitive metabolic reactions.
  • Application in animal models to study acid-base disturbances in conditions like ischemia and heart failure.

Main Results:

  • Hyperpolarized 13C-spectroscopy enables quantification of metabolic substrates and fluxes, such as pyruvate to lactate conversion.
  • Demonstrated ability to assess acid-base alterations and estimate pH in animal models of cardiac disease.
  • The technique shows a good safety profile and is compatible with clinical MRI scanners.

Conclusions:

  • Magnetic resonance spectroscopy and imaging with hyperpolarized 13C-substrates represent a promising non-invasive method for myocardial pH assessment.
  • These techniques have successfully translated to early clinical trials, indicating future clinical applicability.
  • This technology may soon provide routine clinical pH imaging for cardiac conditions.