Backrest Angle and Cardiac Output Measurement in Critically Ill Patients

Abstract

No differences in the continuous cardiac index values across the nine different measurement conditions were found. An examination of the determinants of cardiac output (stroke volume and heart rate) indicated that the lack of change in continuous cardiac index was not a result of a compensatory change in either stroke volume or heart rate. These data indicate that in daily clinical practice with critical medical surgical patients it may be unnecessary to reposition patients solely for the purpose of obtaining continuous cardiac index measurements. The measurements appear to be reproducible at head-of-bed angle up to 45 degrees.