Influence of Positive End-Expiratory Pressure on Myocardial Strain Assessed by Speckle Tracking Echocardiography in Mechanically Ventilated Patients
Figure 2
Four-quadrant trend plot for tracking the relationship in changes of size, strain values of the four cardiac chambers, and stroke volumes. (a) Left ventricle; (b) right ventricle; (c) left atrium; and (d) right atrium. There are no significant correlations between changes in strain values and size of the four cardiac chambers. Black dots indicate patients with a reduction in SV ≤ 15%; red dots indicate patients with a reduction in SV > 15%. Δ represents the changes in measures over time, obtained by subtracting the first measurement (at PEEP of 5 cmH2O) from the third (at PEEP of 15 cmH2O); LV-EDV; left ventricular end diastolic volume; LV-LS; left ventricular-longitudinal strain; RV-EDD; right ventricular end diastolic diameters; RV-LS; right ventricular-longitudinal strain; LAV; left atrial volume; LA-PALS; peak left atrial longitudinal strain; RAV; right atrium volume; and RA-PALS; peak right atrial longitudinal strain.
