Heart & lung : the journal of critical care
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Multicenter Study Comparative Study Clinical Trial
Effects of endotracheal suctioning on mixed venous oxygen saturation and heart rate in critically ill adults.
The purpose of this multisite study was to determine the effects of endotracheal suctioning on mixed venous oxygen saturation (SvO2) and heart rate in 189 critically ill adults. One-pass, intermittent suction was applied for 10 or fewer seconds, with three prehyperoxygenation and three posthyperoxygenation breaths of 100% oxygen. Subjects at three hospitals (n = 127) underwent suctioning using hyperoxygenation with anesthesia bags and traditional suction catheters (open suction method). ⋯ No significant differences were seen in heart rate between subjects having the open versus closed suction method. In conclusion, the closed suction method showed a higher SvO2 after endotracheal suctioning compared with the open suction method (p = 0.0001). Some form of hyperoxygenation before and after endotracheal suctioning is recommended.
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Continuous measurement of mixed venous oxygen saturation (SvO2) is a beneficial method for evaluating overall dynamic tissue oxygen balance in critically ill patients. Several important factors, however, may influence the accurate analysis of SvO2 data trends. In this review we highlight these factors and support cautious interpretation of SvO2 in conjunction with other available patient data and with strict attention to the clinical value and limitations of the parameter.
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Effects of a lateral turn on mixed venous oxygen saturation and heart rate in critically ill adults.
The purpose of this study was to determine the effects of a lateral turn on mixed venous oxygen saturation (SvO2) and heart rate in 183 critically ill adults. Mean SvO2 decreased from a baseline of 67% to 61% saturation (p less than 0.0001) immediately after turning and gradually returned to 66% saturation (p less than 0.002) within 4 minutes. Mean heart rate increased slightly from a baseline of 99 beats/min to 102 beats/min (p less than 0.0001) immediately after turning and decreased slightly to 101 beats/min (p less than 0.0004) within 4 minutes. ⋯ Nurses should expect critically ill patients to have a decrease in SvO2 of approximately 9% of baseline and small changes in heart rate after turning. These changes should be transient, with SvO2 and heart rate gradually returning toward baseline levels during the next 4 minutes. If turning triggers large or prolonged changes in SvO2 or heart rate, prompt repositioning and evaluation are needed to prevent adverse effects.
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The purpose of this study was to describe various dimensions of the pain experiences of intensive care unit (ICU) patients. A purposive, primarily surgical sample of 24 ICU patients from two hospitals was interviewed after transfer from ICU. All but one patient remembered their ICU stay. ⋯ Results of this study clearly indicate that not only pain but its communication and treatment were significant problems for a substantial portion of this ICU sample. Further descriptive and experimental research of pain characteristics and treatment practices for ICU patients is urgently needed. Improvements in nursing practice that result from such research may make a substantial difference in the comfort and well-being of critically ill patients.