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Am J Physiol Heart Circ Physiol (March 25, 2005). doi:10.1152/ajpheart.01180.2004
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Submitted on November 24, 2004
Accepted on March 17, 2005

RV Filling Modulates LV Function By Direct Ventricular Interaction During Mechanical Ventilation

Jamie R Mitchell1, William A Whitelaw1, Rozsa Sas1, Eldon R Smith1, John V Tyberg1, and Israel Belenkie1*

1 Cardiac Sciences, University of Calgary, Calgary, Alberta, Canada

* To whom correspondence should be addressed. E-mail: belenkie{at}ucalgary.ca.

During mechanical ventilation, phasic changes in systemic venous return modulate right ventricular output but may also affect left ventricular function by direct ventricular interaction. In 13 anesthetized, closed-chest, normal dogs, we measured inferior vena cava flow and left and right ventricular dimensions and output during mechanical ventilation, during an inspiratory hold, and (during apnea) vena caval constriction and abdominal compression. During a single ventilation cycle preceded by apnea, positive pressure inspiration decreased caval flow and right ventricular dimension; the transseptal pressure gradient increased, the septum shifted rightward, reflecting an increased left ventricular volume (the anteroposterior diameter did not change) and stroke volume increased. The opposite occurred during expiration. Similarly, the maneuvers which decreased venous return shifted the septum rightward and left ventricular volume and stroke volume increased. Increased venous return had opposite effects. Changes in left ventricular function caused by changes in venous return alone were similar to those during mechanical ventilation except for minor quantitative differences. We conclude that phasic changes in systemic venous return during mechanical ventilation modulate left ventricular function by direct ventricular interaction.




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