BACKGROUND: Prior study has demonstrated that the biplane single-beat method could be used to assess left ventricular function during atrial fibrillation at a beat with equal subsequent cycles. The study was to test whether we could improve the method by measuring a few beats with equal subsequent cycles and cycle-length limits. METHODS: In 75 patients with atrial fibrillation, stroke volume and ejection fraction were determined from simultaneous biplane views of left ventricle for 20 beats using a matrix-array transducer and a biplane Simpson's rule. The influence of cycle lengths on the values of systolic parameters at beats with equal subsequent cycles was examined from the plot of normalized parameters (measured values/average values) against cycle lengths. The values of 1 to 3 beats with equal subsequent cycles and cycle-length limits were averaged and compared with the average values over 20 beats by Bland-Altman and mean percentage difference analysis. The variability of repeat measurements was evaluated in 10 patients. RESULTS: The systolic parameters measured at beats with cycle lengths shorter than 500 ms were usually far below the average values. Agreement and mean percentage difference analysis revealed improved accuracy when 2 or 3 beats with cycle-length limits (>500 ms) were used for assessment. As the variability of averaging 2 or 3 beats is no greater than that of repeat measurements, both methods are equally good. CONCLUSIONS: Accurate assessment of left ventricular systolic function in atrial fibrillation can be obtained by averaging 2 beats with equal subsequent cycles and cycle-length limits (>500 ms).
BACKGROUND: Prior study has demonstrated that the biplane single-beat method could be used to assess left ventricular function during atrial fibrillation at a beat with equal subsequent cycles. The study was to test whether we could improve the method by measuring a few beats with equal subsequent cycles and cycle-length limits. METHODS: In 75 patients with atrial fibrillation, stroke volume and ejection fraction were determined from simultaneous biplane views of left ventricle for 20 beats using a matrix-array transducer and a biplane Simpson's rule. The influence of cycle lengths on the values of systolic parameters at beats with equal subsequent cycles was examined from the plot of normalized parameters (measured values/average values) against cycle lengths. The values of 1 to 3 beats with equal subsequent cycles and cycle-length limits were averaged and compared with the average values over 20 beats by Bland-Altman and mean percentage difference analysis. The variability of repeat measurements was evaluated in 10 patients. RESULTS: The systolic parameters measured at beats with cycle lengths shorter than 500 ms were usually far below the average values. Agreement and mean percentage difference analysis revealed improved accuracy when 2 or 3 beats with cycle-length limits (>500 ms) were used for assessment. As the variability of averaging 2 or 3 beats is no greater than that of repeat measurements, both methods are equally good. CONCLUSIONS: Accurate assessment of left ventricular systolic function in atrial fibrillation can be obtained by averaging 2 beats with equal subsequent cycles and cycle-length limits (>500 ms).
Authors: Roger Dillier; Richard Kobza; Susanne Erne; Michel Zuber; Patricia Arand; Paul Erne Journal: Cardiol Res Pract Date: 2010-10-17 Impact factor: 1.866
Authors: Daniel Modin; Morten Sengeløv; Peter Godsk Jørgensen; Niels Eske Bruun; Flemming Javier Olsen; Maria Dons; Thomas Fritz Hansen; Jan Skov Jensen; Tor Biering-Sørensen Journal: ESC Heart Fail Date: 2017-10-11
Authors: Karina V Bunting; Simrat K Gill; Alice Sitch; Samir Mehta; Kieran O'Connor; Gregory Yh Lip; Paulus Kirchhof; Victoria Y Strauss; Kazem Rahimi; A John Camm; Mary Stanbury; Michael Griffith; Jonathan N Townend; Georgios V Gkoutos; Andreas Karwath; Richard P Steeds; Dipak Kotecha Journal: Heart Date: 2021-03-10 Impact factor: 7.365