First-pass radionuclide angiography during bicycle and treadmill exercise

Area of Science:

• Cardiology
• Nuclear Medicine
• Diagnostic Imaging

Background:

• Treadmill testing is generally preferred for coronary artery disease diagnosis due to higher sensitivity compared to cycle ergometry.
• Radionuclide angiography (RNA) imaging during treadmill exercise is challenging due to patient motion.
• This study investigates the comparability of treadmill and cycle exercise RNA using a dual isotope motion correction technique.

Purpose of the Study:

• To evaluate the feasibility and comparability of treadmill exercise radionuclide angiography (RNA) against cycle ergometry RNA.
• To assess the technical adequacy and clinical outcomes of treadmill exercise RNA.
• To determine if treadmill exercise offers diagnostic advantages over cycle ergometry when combined with RNA.

Main Methods:

• Twenty-seven volunteer patients underwent first-pass radionuclide angiography (RNA) during maximal exercise on both a cycle ergometer and a treadmill.
• A dual isotope motion correction technique was employed to address imaging difficulties associated with patient motion during treadmill exercise.
• Exercise capacity, heart rate, systolic blood pressure, and left ventricular ejection fraction were measured and compared between the two exercise modalities.

Main Results:

• Exercise capacity and maximal heart rate were higher during treadmill exercise compared to cycle ergometry.
• While systolic blood pressure was higher during cycle ergometry, the rate-pressure product showed no significant difference between the two methods.
• Peak exercise left ventricular ejection fraction and resting end-diastolic volume were similar; however, end-diastolic volume at peak exercise differed significantly, with higher values during treadmill exercise. Clinical impressions based on wall motion and ejection fraction were very similar.

Conclusions:

• Treadmill exercise radionuclide angiography (RNA) is a feasible technique, with approximately 85% of studies being technically adequate.
• The clinical results obtained from treadmill exercise RNA are comparable to those from cycle ergometry RNA.
• The expected advantages of treadmill exercise in terms of diagnostic sensitivity were not fully realized in this study when combined with RNA.