Measuring Left Ventricular Peak Longitudinal Systolic Strain from a Single Beat in Atrial Fibrillation: Validation of the Index Beat Method

Feasibility of One-Beat Real-Time Full-Volume Three-Dimensional Echocardiography for Assessing Left Ventricular Volumes and Deformation Parameters

“…We verified that the LV mechanical parameters measured using the index beat were highly correlated with and identical to the mean values of corresponding parameters in consecutive multiple beats. Although several studies [20][21][22][23][24] reported the potential utility of using the index beat to determine LVEF and longitudinal strain, all of these studies used only one 2D cutting plane (apical four-chamber view), which does not always reflect the global function of the left ventricle. Biplane or triplane mode might overcome some limitations.…”

Myocardial performance index derived from pre-ejection period as a novel and useful predictor of cardiovascular events in atrial fibrillation

“…Left ventricular dimensions, LVEF, LAVI, LVMI, PEPa, IVRTa, Eta, and PEPa-derived MPI were measured using the index beat method [20][21][22]. Because their measurements were easy and rapid, the transmitral E-wave velocity (E), E-wave deceleration time, Ea and Sa were obtained from five beats [4] and the data were averaged to give the mean value for later analysis.…”

Almanac 2014: Cardiovascular Imaging.

“…8, 9 Za indeks otkucaja se uzima otkucaj nakon dva gotovo ista kardiološka ciklusa. Dva intervala koja prethode indeks otkucaju moraju biti duljine barem 500 ms, a razlika između ta dva otkucaja mora biti manja od 60 ms. Su et al su pokazali da je GLS bolji od EF lijeve klijetke i od sistoličke mitralne anularne brzine za predviđanje kardiovaskularnih događaja.…”

“…8, 9 The index beat is taken as the beat following two nearly equal preceding cardiac cycles. The two intervals preceding the index beat must be at least 500 ms duration and the difference between these two beats must be less than 60 ms. Su et al showed that GLS was better than left ventricular EF and systolic mitral annular velocity for predicting cardiovascular events.…”