Figure 4. Correlation between LVESD in the prone position (Y axis) and the corresponding measurement in the supine position (x axis) ( r = 0.728. P < 0.001)
Bland-Altman plots were performed to show accuracy and agreement between each of LVEDD, LVESD, SWT, PWT, and AoR dimensions in the prone position versus the standard supine position. The differences between each of the measurements were plotted against the averages of the measurements in both positions. The mean of the difference and the upper and lower limits of differences were estimated.
All measurements for LVEDD, LVESD, SWT, PWT and AoR dimensions in the prone position were accurate and agreed well with their corresponding measurements in the supine
position with very small mean differences, as shown in Table 3 . Measurements of SWT and PWT dimensions, followed by LVES dimensions, in the prone position were the most accurate, and agreed well with their corresponding measurements in the supine position, as they showed the smallest mean differences as shown in Figures 5, 6 and 7respectively. LVED dimension in the prone position was the farthest from its corresponding measurement in the supine position (as it showed the largest mean difference).