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Joanna R Fair¹, Philip H Heintz¹, Robert J Telepak¹

¹Department of Radiology, University of New Mexico School of Medicine, Albuquerque, New Mexico.

Journal of Applied Clinical Medical Physics

|August 21, 2009

Summary

Before adopting new systems for left ventricular ejection fraction (LVEF) radionuclide gated ventriculogram (MUGA) imaging, a study found significant discrepancies. The new systems did not consistently match existing technology, potentially impacting clinical decisions.

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Area of Science:

Nuclear Medicine
Cardiovascular Imaging
Medical Device Evaluation

Background:

Accurate assessment of left ventricular ejection fraction (LVEF) is crucial for patient management, particularly in oncology.
Radionuclide gated ventriculography (MUGA) is a standard technique for LVEF measurement.
Evaluating new imaging systems prior to clinical implementation is essential for maintaining diagnostic accuracy.

Purpose of the Study:

To compare the accuracy and consistency of two new LVEF radionuclide gated ventriculogram (MUGA) systems against a current standard system.
To determine the potential clinical impact of discrepancies in LVEF measurements from the new systems.
To inform the decision regarding the adoption of new MUGA systems at the institution.

Main Methods:

A parallel study design involving 315 consecutive patients undergoing LVEF assessment.
Simultaneous acquisition and processing of gamma-camera data using semi-automatic Medasys Pinnacle and fully-automatic/semi-automatic Philips nuclear medicine computer systems.
Comparative analysis of LVEF results between the Medasys and Philips systems.

Main Results:

The Philips systems achieved LVEF results within +/- 5 percentage points of the Medasys system in less than 50% of studies.
Significant deviations in LVEF values were observed between the new Philips systems and the established Medasys system.
Potential changes in clinical decisions for chemotherapy in cancer patients were identified in 17% of studies due to LVEF discrepancies.

Conclusions:

Neither of the new LVEF MUGA systems demonstrated sufficient accuracy and consistency for implementation.
Discrepancies in LVEF measurements could have led to altered clinical management, particularly in cancer patient chemotherapy.
The institution decided against adopting the evaluated Philips MUGA systems based on the study findings.