Brain temperature in volunteers subjected to intranasal cooling
(2011) In Intensive Care Medicine 37(8). p.1277-1284- Abstract
- Intranasal cooling can be used to initiate therapeutic hypothermia. However, direct measurement of brain temperature is difficult and the intra-cerebral distribution of temperature changes with cooling is unknown. The purpose of this study was to measure the brain temperature of human volunteers subjected to intranasal cooling using non-invasive magnetic resonance (MR) methods. Intranasal balloons catheters circulated with saline at 20A degrees C were applied for 60 min in ten awake volunteers. No sedation was used. Brain temperature changes were measured and mapped using MR spectroscopic imaging (MRSI) and phase-mapping techniques. Heart rate and blood pressure were monitored throughout the experiment. Rectal temperature was measured... (More)
- Intranasal cooling can be used to initiate therapeutic hypothermia. However, direct measurement of brain temperature is difficult and the intra-cerebral distribution of temperature changes with cooling is unknown. The purpose of this study was to measure the brain temperature of human volunteers subjected to intranasal cooling using non-invasive magnetic resonance (MR) methods. Intranasal balloons catheters circulated with saline at 20A degrees C were applied for 60 min in ten awake volunteers. No sedation was used. Brain temperature changes were measured and mapped using MR spectroscopic imaging (MRSI) and phase-mapping techniques. Heart rate and blood pressure were monitored throughout the experiment. Rectal temperature was measured before and after the cooling. Mini Mental State Examination (MMSE) test and nasal inspection were done before and after the cooling. Questionnaires about the subjects' personal experience were completed after the experiment. Brain temperature decrease measured by MRSI was -1.7 +/- A 0.8A degrees C and by phase-mapping -1.8 +/- A 0.9A degrees C (n = 9) at the end of cooling. Spatial distribution of temperature changes was relatively uniform. Rectal temperature decreased by -0.5 +/- A 0.3A degrees C (n = 5). The physiological parameters were stable and no shivering was reported. The volunteers remained alert during cooling and no cognitive dysfunctions were apparent in the MMSE test. Postcooling nasal examination detected increased nasal secretion in nine of the ten volunteers. Volunteers' acceptance of the method was good. Both MR techniques revealed brain temperature reductions after 60 min of intranasal cooling with balloons circulated with saline at 20A degrees C in awake, unsedated volunteers. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2091583
- author
- Covaciu, L. ; Weis, J. ; Bengtsson, C ; Allers, M. ; Lunderquist, Anders LU ; Ahlstrom, H. and Rubertsson, S.
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Therapeutic hypothermia, Brain temperature, Magnetic resonance, spectroscopy, Selective brain cooling, Trigeminal reflex
- in
- Intensive Care Medicine
- volume
- 37
- issue
- 8
- pages
- 1277 - 1284
- publisher
- Springer
- external identifiers
-
- wos:000292815000007
- scopus:79961021453
- pmid:21647717
- ISSN
- 0342-4642
- DOI
- 10.1007/s00134-011-2264-7
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Laboratory for Experimental Brain Research (013041000)
- id
- 5f61f407-9266-4528-bb00-37581a2f3c99 (old id 2091583)
- date added to LUP
- 2016-04-01 10:30:48
- date last changed
- 2022-02-10 02:51:03
@article{5f61f407-9266-4528-bb00-37581a2f3c99,
abstract = {{Intranasal cooling can be used to initiate therapeutic hypothermia. However, direct measurement of brain temperature is difficult and the intra-cerebral distribution of temperature changes with cooling is unknown. The purpose of this study was to measure the brain temperature of human volunteers subjected to intranasal cooling using non-invasive magnetic resonance (MR) methods. Intranasal balloons catheters circulated with saline at 20A degrees C were applied for 60 min in ten awake volunteers. No sedation was used. Brain temperature changes were measured and mapped using MR spectroscopic imaging (MRSI) and phase-mapping techniques. Heart rate and blood pressure were monitored throughout the experiment. Rectal temperature was measured before and after the cooling. Mini Mental State Examination (MMSE) test and nasal inspection were done before and after the cooling. Questionnaires about the subjects' personal experience were completed after the experiment. Brain temperature decrease measured by MRSI was -1.7 +/- A 0.8A degrees C and by phase-mapping -1.8 +/- A 0.9A degrees C (n = 9) at the end of cooling. Spatial distribution of temperature changes was relatively uniform. Rectal temperature decreased by -0.5 +/- A 0.3A degrees C (n = 5). The physiological parameters were stable and no shivering was reported. The volunteers remained alert during cooling and no cognitive dysfunctions were apparent in the MMSE test. Postcooling nasal examination detected increased nasal secretion in nine of the ten volunteers. Volunteers' acceptance of the method was good. Both MR techniques revealed brain temperature reductions after 60 min of intranasal cooling with balloons circulated with saline at 20A degrees C in awake, unsedated volunteers.}},
author = {{Covaciu, L. and Weis, J. and Bengtsson, C and Allers, M. and Lunderquist, Anders and Ahlstrom, H. and Rubertsson, S.}},
issn = {{0342-4642}},
keywords = {{Therapeutic hypothermia; Brain temperature; Magnetic resonance; spectroscopy; Selective brain cooling; Trigeminal reflex}},
language = {{eng}},
number = {{8}},
pages = {{1277--1284}},
publisher = {{Springer}},
series = {{Intensive Care Medicine}},
title = {{Brain temperature in volunteers subjected to intranasal cooling}},
url = {{http://dx.doi.org/10.1007/s00134-011-2264-7}},
doi = {{10.1007/s00134-011-2264-7}},
volume = {{37}},
year = {{2011}},
}