In conclusion, this study confirms that variation of correlation between TTE IVCD measurement and RAP depends on the ultrasonographic methodology used and the timing of measurement during the cardiac cycle. Mean bias between the 2 TTE methods (Bland-Altman analysis) was 1.6 mm (SD +/- 2.03 mm). IVCD at end-expiration and end-diastole, with ECG synchronization, using the M-mode, and IVCD at end-expiration, without ECG synchronization, using the 2-dimensional long-axis view, correlate linearly with RAP (0.81, P <.0001 and 0.71, P =.0004). All measurements were taken in the supine position. RAP was measured simultaneously by using a central venous catheter positioned in the superior vena cava. Second, IVCD was assessed at end-expiration, without ECG synchronization, using the 2-dimensional long-axis view at the same location. First, IVCD was measured at end-expiration and end-diastole, with ECG synchronization, using the M-mode, on short-axis view 2 cm below the right atrium. The TTE measures of IVCD were made, using methods previously cited.
Twenty patients who were critically ill, sedated, and required respiratory support were prospectively studied by TTE during mechanical ventilation in a controlled mode. The purpose of this study was to test if the correlation between IVCD and RAP measurement in patients who are critically ill depends on the transthoracic echocardiography (TTE) methodology used. In patients who are mechanically ventilated, the correlation between inferior vena cava diameter (IVCD) measurements and mean right atrial pressure (RAP) varies in the literature.
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