Diastolic function with 16-phase gated myocardial perfusion SPECT

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.