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Diastolic function with 16-phase gated myocardial perfusion SPECT.

Noel M Bennett1, Salima Qamruddin, Patrick M Colletti

  • 1From the *Keck School of Medicine of the University of Southern California; and †Department of Radiology, LAC+USC Medical Center, Los Angeles, CA.

Clinical Nuclear Medicine
|June 4, 2014
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Summary

This study explores using gated myocardial perfusion SPECT to assess diastolic dysfunction, a common issue in heart failure with preserved ejection fraction. Results show SPECT time-volume curves correlate with echo Doppler, suggesting its potential for evaluating diastolic function.

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Area of Science:

  • Cardiology
  • Nuclear Medicine
  • Cardiovascular Imaging

Background:

  • Diastolic dysfunction is a key feature of heart failure with preserved systolic function (HFpEF).
  • Abnormalities range from impaired left ventricle (LV) relaxation to restrictive filling, potentially causing left atrial dilatation and atrial fibrillation.
  • Gated myocardial perfusion SPECT (MPS) is primarily used for systolic function assessment (LV volumes, ejection fraction), with limited consideration for diastolic dysfunction evaluation.

Purpose of the Study:

  • To investigate the utility of 16-phase gated SPECT time-volume curves in assessing diastolic dysfunction.
  • To correlate gated SPECT derived parameters with established echocardiographic measures of diastolic function.

Main Methods:

  • Utilized 16-phase gated myocardial perfusion SPECT (MPS) to generate time-volume curves.
  • Correlated these SPECT-derived curves with echo Doppler measurements, specifically the early/late diastolic flow ratios.
  • Analyzed the relationship between SPECT parameters and echocardiographic indices of diastolic function.

Main Results:

  • Demonstrated a correlation between 16-phase gated SPECT time-volume curves and echo Doppler early/late diastolic flow ratios.
  • Indicates that SPECT-derived volumetric data can reflect diastolic abnormalities.
  • Suggests a potential role for gated SPECT in the non-invasive assessment of diastolic dysfunction.

Conclusions:

  • Gated myocardial perfusion SPECT has the potential to assess diastolic dysfunction beyond its traditional role in evaluating systolic function.
  • Time-volume curves derived from gated SPECT may serve as a valuable tool for characterizing diastolic abnormalities.
  • Further research can explore integrating diastolic function assessment into routine gated SPECT protocols for comprehensive cardiac evaluation.