Introduction:Global longitudinal strain (GLS) of left ventricle (LV) has an incremental value over conventional parameters like ejection fraction for risk stratification in patients referred for cardiac surgery . Mitral annular plane systolic excursion is a simple parameter obtained by M mode, is also an sensitive marker of LV function in various clinical settings . It has been demonstrated that, MAPSE and GLS has similar biological variability in healthy population. The aim of this study was to assess correlation of MAPSE and GLS in patients with ischemic heart disease undergoing coronary artery bypass surgery (CABG).
This was a retrospective study of 51 patients undergoing CABG. A cardiac anesthetist performed transthoracic echocardiography exam within 24 hours of surgery. GLS was measured by three apical views: 4-chamber, 2-chamber and long axis view and average value measured. Average MAPSE was obtained in apical 4-chamber view by aligning M mode cursor at lateral and septal mitral annulus and averaging the two values. Measurements of GLS and MAPSE in a sample patient are shown in figure 1. A Pearson's product-moment correlation was run to assess the relationship between MAPSE and GLS.
The average age of patients was 60 years with 26% females. The average mean GLS was -12.8 -2.9% and average MAPSE was 10 1.9mm. Figure 2 shows Pearson's product-moment correlation between two parameters, demonstrating a strong positive correlation with corelation coefficient, r= 0.83 (p < .0005).
MPASE and GLS are significantly correlated in patients undergoing CABG and MAPSE being simple parameter can be used as surrogate marker for GLS.
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