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The Influence of Left Lateral Position on Cardiac Output Changes after Head Up Tilt Measured by Impedance Cardiography

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Abstract

Background.The value of the impedance cardiography (IC) method formeasuring cardiac output (CO) with the subject in the left lateral positionhas not yet been established. We compared the CO after a 30° head-up tiltwith the subjects in the supine and left lateral position. Methods.Thirty healthy young volunteers were placed in the supine horizontalposition. CO, stroke volume (SV) and heart rate (HR) were measured for fiveminutes using impedance cardiography (NCOMM3, BoMed Medical Manufacturing,Location). Then a 30° head-up tilt was done and the measurements werecontinued for an additional five minutes. After that the subjects were placedin the left lateral horizontal position and the measuring procedure wasrepeated. Results.After the tilt, SV and cardiac index (CI) decreasedand HR increased statistically significantly in the supine and in the leftlateral position. SV and CI also decreased statistically significantly but HRdid not change after the shift from the supine to the left lateral position.Although CI was smaller in the left lateral position, the time course of CIchange after the tilt was identical in the supine and in the left lateralposition. Conclusion.When using the IC method of SV measurement, theabsolute value of the CI changes when moving from the supine to lateralpositions. It is not clear whether this change is physiologic or an artifactof the measurement technique. However, changes in CI in response to a 30degree head up tilt are the same in either position. We conclude that changesin CI can be measured with the IC method in the lateral position.

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  1. From the Department of Anesthesiology, Intensive Care and Pain Management, Maribor Teaching Hospital, Maribor, Slovenia

    Mirt Kamenik

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  1. Mirt Kamenik
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Kamenik, M. The Influence of Left Lateral Position on Cardiac Output Changes after Head Up Tilt Measured by Impedance Cardiography. J Clin Monit Comput 15, 519–523 (1999). https://doi.org/10.1023/A:1009968513512

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