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Review
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Korean J Med. 2006;71(1):283-283.
- A Novel Technique for assessing myocardial performance index in atrial fibrillation:Dual pulse wave Doppler method.
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- A Novel Technique for assessing myocardial performance index in atrial fibrillation:Dual pulse wave Doppler method.
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1Department of Internal Medicine, Hanyang University College of Medicine, Seoul; 2Department of Life Science, Postech Biotech Center, Pohang University of Science and Technology, Pohang, Korea
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- Abstract
- Background : The myocardial performance index(MPI) is well known parameter for evaluating global systolic function. But it
cannot be calculated in atrial fibrillation(AF) either by pulsed wave(PW) doppler method nor by tissue Doppler method because
of ambiguous or absence of A and a wave. Objective : We developed Dual pulsed wave doppler method which enabled us
to obtain both mitral and aortic PW at the same cardiac cycle including surface ECG from apical 5 chamber view. We planned to
determine this method are feasible and reliable in assessing MPI in AF Methods : The isovolumetric contraction time (ICT) was
measured from onset of QRS on surface ECG to the onset of aortic PW, the ejection time (ET) from the onset to the end of aortic
PW, and the isovolumetric relaxation time (IRT) from the end of aortic PW to the onset of mitral PW. We caculated MPI repeatedly
in 11 patients with AF up to 8 cardiac cycles Results : We were able to calculate clearly MPI in all patients. Intraclass correlation
coefficient(ICC) for the MPI was 0.84 (95% confidence interval (95% CI), 0.71-0.94), for ET 0.90 (95% CI, 0.80-0.97), for ICT 0.88(95%
CI, 0.76-0.96) and for IRT 0.73(95% CI, 0.53-0.90); all p value < 0.01. But heart rate showed poor agreement which reflect variation
of cardiac cycle length in AF(ICC= 0.47 (95% CI, 0.24-0.74)). Conclusion : Dual PW doppler method enabled us to calculate the MPI
even on AF. MPI obtained from this method may help to assess on systolic function in AF.
Keywords :
