Fig. 4From: The impact of heart, lung and diaphragmatic ultrasound on prediction of failed extubation from mechanical ventilation in critically ill patients: a prospective observational pilot studyInteratrial septal movements during the cardiac cycle. Fixed rightward interatrial septum curvature is bowing of the interatrial septal to right throughout the cardiac cycle, and mid-systolic reversal is reversal of the septum from right to left during mid-systoleBack to article page