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Updated: May 23, 2026
In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
Published on: February 16, 2016
Quantification of diagnostic accuracy using nitrate enhanced Tc-99m sestamibi gated myocardial SPECT in assessing
Zahid Rahman Khan1, Aitizazuddin Syed, Lubna Noor
1Department of Radiodiagnostics and Medical Imaging, North West Armed Forces Hospital, PO Box: 100, Tabuk, Kingdom of Saudi Arabia. khanzahid2001@hotmail.com
Insights
Nitrate-enhanced technetium-99m sestamibi imaging improves detection of hibernating myocardium in coronary artery disease patients. Gated images further enhance accuracy, especially in borderline cases, aiding treatment decisions.
Area of Science:
- Nuclear Cardiology
- Cardiovascular Imaging
- Myocardial Perfusion Imaging
Background:
- Coronary artery disease (CAD) and myocardial infarction (MI) are significant causes of heart disease.
- Assessing myocardial viability is crucial for guiding revascularization strategies.
- Traditional imaging techniques may have limitations in detecting all viable myocardium.
Purpose of the Study:
- To evaluate the effectiveness of nitrate-enhanced technetium-99m sestamibi gated single-photon emission computed tomography (SPECT) for assessing myocardial viability.
- To compare nitrate-enhanced imaging with baseline imaging in patients with known CAD.
- To determine the added value of gated SPECT in evaluating myocardial function and viability.
Main Methods:
- Prospective study of 48 patients with known CAD and history of MI.
- Baseline Tc-99m sestamibi SPECT performed at rest.
- Nitrate-enhanced Tc-99m sestamibi SPECT performed the following day.
- Analysis of myocardial segments for viability, including gated SPECT for wall motion and thickness assessment.
Main Results:
- Nitrate-enhanced imaging showed an overall viability improvement of 12.04% across all analyzed segments.
- Gated nitrate-enhanced SPECT demonstrated a 2.02% improvement in overall viability.
- Significant increases in detected viable segments were observed in the left anterior descending, right coronary, and left circumflex territories.
Conclusions:
- Nitrate augmentation significantly enhances the detection of hibernating myocardium using Tc-99m sestamibi SPECT.
- Gated SPECT images provide additional information on wall motion and thickness, improving diagnostic accuracy.
- This imaging approach aids in identifying viable myocardium, crucial for patient management in CAD.
Abstract:
The aim of this prospective study was to assess myocardial viability with nitrate-enhanced Tc-99m sestamibi gated single-photon emission computed tomography in patients with known coronary artery disease. We enrolled 48 consecutive patients (39 men, 9 women) aged 24-82 years, with coronary artery disease and history of myocardial infarction. A Tc-99m sestamibi study was conducted at rest as baseline, followed by a nitrate-enhanced study the next day. Of 960 segments analyzed, 244 of 480 in the left anterior descending coronary artery territory showed viability on the baseline study, and 276 were viable according to the nitrate-enhanced study. Similarly, of 192 right coronary segments analyzed, 148 showed viability on the baseline study compared to 153 on the nitrate study. Of 288 left circumflex territory segments analyzed, 206 showed viability on the baseline study compared to 241 on the nitrate study. The overall improvement of viability with the nitrate study was 12.04%. On the gated studies, the overall improvement with nitrate was 2.02%. The gated study also allowed grading of wall motion and thickness. It was concluded that nitrate-augmented Tc-99m sestamibi myocardial imaging significantly improved the detection of hibernating myocardium, with gated images further improving the accuracy of detection in borderline cases.
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