Document Detail

ICP measurement accuracy: the effect of temperature drift. Design of a laboratory test for assessment of ICP transducers.
MedLine Citation:
PMID:  10202697     Owner:  NLM     Status:  MEDLINE    
Intracranial pressure (ICP) monitoring has become the mainstay of multimodal neuromonitoring of comatous patients after head injury. In the presence of rising ICP and faced with pressures, difficult to control, aggressive measures, such as hypothermia may be used. The ICP readings should not be influenced by temperature changes. A laboratory test was designed to simulate temperature variations between 20 degrees C and 45 degrees C at different pressure levels under physiological conditions. Five types of transducers were examined: Epidyn Braun Melsungen, ICT/B-Titan Gaeltec, Camino-OLM-110-4B, Codman MicroSensor ICP-Transducer, Neurovent ICP transducer Rehau Ag+Co. Tests were performed at 6 different pressure levels between 0 mmHg and 50 mmHg. The results show very low drifts of less than 0.15 mmHg degree C-1 for Codman, Epidyn and Neurovent. Gaeltec and Camino exhibited higher drifts of 0.18 mmHg and 0.2 mmHg degree C-1 respectively. Within the temperature range from 35 degrees C to 42 degrees C all probes tested show insignificant temperature drift. Whether these results also apply to other types of transducers needs further evaluation. Problems and requirements related to the design of a laboratory test for the in vitro assessment of ICP transducers are discussed in detail.
M H Morgalla; H Mettenleiter; T Katzenberger
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of medical engineering & technology     Volume:  23     ISSN:  0309-1902     ISO Abbreviation:  J Med Eng Technol     Publication Date:    1999 Jan-Feb
Date Detail:
Created Date:  1999-10-22     Completed Date:  1999-10-22     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7702125     Medline TA:  J Med Eng Technol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  10-4     Citation Subset:  IM    
Neurosurgical Service, Massachusetts General Hospital, Harvard Medical School, Boston, USA.
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MeSH Terms
Biomedical Engineering / instrumentation,  standards
Body Temperature / physiology*
Coma / physiopathology
Craniocerebral Trauma / physiopathology
Equipment Design / standards
Equipment Safety
Hypothermia, Induced
Intracranial Hypertension / therapy
Intracranial Pressure / physiology*
Monitoring, Physiologic / instrumentation*,  standards
Reproducibility of Results
Transducers* / standards

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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