Direct and indirect quantification of mitral regurgitation with cardiovascular magnetic resonance, and the effect of heart rate variability.

Magma
Saul G MyersonStefan Neubauer

Abstract

Quantifying mitral regurgitation with cardiovascular magnetic resonance (CMR) involves indirect calculation, which increases the potential for error. We examined a direct quantification method using velocity mapping across the mitral valve, which may be less susceptible to error, and also examined the effect of heart rate variability on both techniques. Fifty-five patients underwent mitral regurgitation quantification with CMR by the direct method and two indirect methods-the standard method subtracting aortic flow (assessed by velocity mapping) from left ventricular stroke volume (assessed by cine imaging) and the 'volumetric' method using the difference between left and right ventricular stroke volumes. The methods were compared using Bland-Altman analyses. Patients with low heart rate variability (beat-to-beat variability <30 bpm; n = 44) showed good agreement between direct and indirect methods (95% confidence limits for the difference between measurements +/-16.7 ml/11.8% regurgitant fraction for the standard method; +/-21.7 ml/15.4% for the volumetric method), with no significant offset (mean difference +2.8 ml/+1.9% for standard and +3.1 ml/+2.3% for volumetric methods). Patients with high heart rate variability (>30 bpm...Continue Reading

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Citations

Jan 21, 2012·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·Saul G Myerson
Oct 22, 2011·Progress in Cardiovascular Diseases·Christopher T Rodgers, Matthew D Robson
Oct 22, 2011·Progress in Cardiovascular Diseases·Theodoros D Karamitsos, Saul G Myerson
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Nov 30, 2020·JACC. Cardiovascular Imaging·Saul G Myerson

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