NDLI: Respiratory induced heart rate and blood pressure variability during mechanical ventilation in critically ill and brain death patients

Content Provider	IEEE Xplore Digital Library
Author	Jurak, P. Zvonicek, V. Leinveber, P. Halamek, J. Vondra, V.
Copyright Year	2012
Description	Author affiliation: Dept. of Anaesthesiology & Intensive Care, St. Anna's Univ. Hosp., Brno, Czech Republic (Zvonicek, V.) \|\| Inst. of Sci. Instrum., Brno, Czech Republic (Jurak, P.; Halamek, J.; Vondra, V.) \|\| Int. Clinical Res. Center, St. Anne's Univ. Hosp. Brno, Brno, Czech Republic (Leinveber, P.)
Abstract	We analysed respiratory induced heart rate and blood pressure variability in mechanically ventilated patients with different levels of sedation and central nervous system activity. Our aim was to determine whether it is possible to distinguish different levels of sedation or human brain activity from heart rate and blood pressure. We measured 19 critically ill and 15 brain death patients ventilated at various respiratory frequencies - 15, 12, 8 and 6 breaths per minute. Basal and deeper sedation was performed in the critically ill patients. We detected and analysed heart rate and blood pressure parameters induced by ventilation. Results: Respiratory induced heart rate variability is the unique parameter that can differentiate between brain death patients and sedated critically ill patients. Significant differences exist, especially during slow deep breathing with a mean period of 10 seconds. The limit values reflecting brain death are: baroreflex lower than 0.5 ms/mmHg and tidal volume normalised heart rate variability lower than 0.5 ms/ml. Reduced heart rate variability parameters of brain death patients remain unchanged even after normalisation to respiration volume. However, differences between basal and deep sedation do not appear significant on any parameter.
Sponsorship	IEEE Eng. Medicine Biol. Soc.
Starting Page	3821
Ending Page	3824
File Size	449503
Page Count	4
File Format	PDF
ISBN	9781424441198
ISSN	1557170X
e-ISBN	9781457717871
DOI	10.1109/EMBC.2012.6346800
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-08-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heart rate variability Baroreflex TV Blood pressure Resonant frequency Ventilation
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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