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. Author manuscript; available in PMC: 2015 Dec 1.

Published in final edited form as: Catheter Cardiovasc Interv. 2014 Mar 11;84(7):1138–1145. doi: 10.1002/ccd.25433

(Pressures on the Y-axis are recorded in mmHg) The right atrial (RA, blue) pressure rises above the left atrial (LA, red) pressure very transiently during the onset of inspiration (black arrow). This is indicated by the RA-LA (purple) tracing exceeding zero at these times. White arrow represents one of the 2 second end-expiratory intervals which were used to define baseline.

(Pressures on the Y-axis are recorded in mmHg) The right atrial (RA, blue) pressure rises above the left atrial (LA, red) pressure very transiently during the onset of inspiration (black arrow). This is indicated by the RA-LA (purple) tracing exceeding zero at these times. White arrow represents one of the 2 second end-expiratory intervals which were used to define baseline.