| Real-time monitoring of heart rate variability in critically ill patients. | |
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MedLine Citation:
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PMID: 19781905 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: Heart rate variability (HRV) is widely used to evaluate autonomic nervous function; however, real-time monitoring of HRV has rarely been attempted in the intensive care unit (ICU). We report our experience in performing real-time monitoring of HRV in our ICU. METHODS: We investigated 10 critically ill patients on total ventilatory support. Heart rate variability analysis was performed using the MemCalc system, which is a noninvasive, real-time analysis system. The low-frequency (LF) component of HRV reflects sympathetic and parasympathetic modulation, whereas the high-frequency (HF) component mainly reflects parasympathetic modulation. The LF/HF ratio represents a measure of sympathetic/parasympathetic balance. RESULTS: The HRV parameters for patients breathing spontaneously after extubation were significantly higher than those for patients on total ventilatory support. These findings suggest that mechanical ventilation under sedation may reduce autonomic nervous function in critically ill patients. In a representative case with septic shock, systolic blood pressure and LF/HF ratio showed a significant increase after intravenous infusion of epinephrine and then the HF component showed a significant increase due to vagal reflex. CONCLUSIONS: The MemCalc system is practicable for real-time monitoring of HRV in the ICU. Heart rate variability parameters may offer useful information in the management of critically ill patients. |
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Authors:
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Shunji Kasaoka; Takashi Nakahara; Yoshikatsu Kawamura; Ryosuke Tsuruta; Tsuyoshi Maekawa |
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Publication Detail:
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Type: Evaluation Studies; Journal Article Date: 2009-09-24 |
Journal Detail:
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Title: Journal of critical care Volume: 25 ISSN: 1557-8615 ISO Abbreviation: J Crit Care Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-10 Completed Date: 2010-07-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8610642 Medline TA: J Crit Care Country: United States |
Other Details:
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Languages: eng Pagination: 313-6 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2009. Published by Elsevier Inc. |
Affiliation:
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Advanced Medical Emergency and Critical Care Center, Yamaguchi University Hospital, Ube, Yamaguchi 755-8505, Japan. skasa@yamaguchi-u.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Autonomic Nervous System
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physiology* Critical Care / methods* Critical Illness Female Heart Rate / physiology* High-Frequency Ventilation Humans Intensive Care Units Male Middle Aged Monitoring, Physiologic / methods* Respiration, Artificial Systemic Inflammatory Response Syndrome / physiopathology*, therapy |
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