Gated SPECT Assessment of Left Ventricular Function is Sensitive to Small Patient Motions and to Low Rates of Triggering Errors: a Comparison with Equilibrium Radionuclide Angiography

Overview

Journal J Nucl Cardiol

Specialty Cardiology & Vascular Diseases

Date 2005 Feb 1

PMID 15682368

Citations 3

Authors

Wassila Djaballah

Marc A Muller

Anne C Bertrand

Pierre Y Marie

Bernard Chalon

Karim Djaballah

Pierre Olivier

Andrei Codreanu

Gilles Karcher

Alain Bertrand

Affiliations

Soon will be listed here.

Abstract

Background: Patient displacements and errors in R-wave detection are the main causes of inaccurate acquisition for gated single photon emission computed tomography (SPECT) and equilibrium radionuclide angiography (RNA). This study aimed to compare the influences of both factors between gated SPECT and RNA determinations of left ventricular ejection fraction.

Methods And Results: On gated SPECT and RNA acquisitions, recorded in 20 patients with coronary artery disease, we simulated the consequences of (1) 3-dimensional patient displacements of low (6.7 mm), moderate (13.4 mm), and high amplitude (20.1 mm) and (2) an erroneous triggering on T waves in 10% to 40% of recorded beats. Absolute values of left ventricular ejection fraction changes from baseline were higher with gated SPECT compared with RNA for patient displacements of low amplitude (5.0% +/- 3.8% vs 1.2% +/- 0.9%, P < .001) or moderate amplitude (10.0% +/- 6.2% vs 3.0% +/- 2.3%, P = .001) but not for patient displacements of high amplitude (12% +/- 9% vs 9% +/- 7%, P = not significant) and inaccurate triggering (for 20% T-wave triggering, 8.9% +/- 3.6% vs 7.9% +/- 3.0%; P = not significant).

Conclusion: Contrary to RNA, gated SPECT is vulnerable to small patient displacements, and thus, specific efforts might be useful for limiting this potential cause of erroneous results. Both techniques may be affected by low rates of triggering errors, suggesting that small acceptance windows on cycle length should be recommended not only for RNA but also for gated SPECT.

Citing Articles

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