Cerebral Blood Flow (CBF) Monitoring in Intensive Care by Thermal Diffusion

Carter, L. P.; Weinand, Martin E.; Oommen, Kalarickal J.

doi:10.1007/978-3-7091-9302-0_7

Cited by 14 publications

(12 citation statements)

References 7 publications

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“…3 However, a severe head injury may result in patients having either an ischemic or hyperemic brain. 4,6,9,[11][12][13]15 Ischemia may follow a hyperemic episode, as seen in most of the patients in the second group. Treatment should be tailored to each patient depending on whether they have ischemia or hyperemia.…”

Section: Discussionmentioning

confidence: 99%

“…TDF allows continuous monitoring of CBF in a small area of the brain. 9,[11][12][13][14][15] This may or may not be representative of overall CBF, but the temporal relationships may determine whether treatment is helpful in normalizing CBF, or more importantly, detect early neurological deterioration. As seen in the first group of patients, persistently low rCoBF denotes a poor outcome.…”

Section: Discussionmentioning

confidence: 99%

“…There has long been a need for a simple way of continuously monitoring CBF reliably. [6][7][8][9][10][11][12][13][14][15] In this clinical study, we present the techniques and results of regional cerebral blood flow (rCoBF) monitoring with thermal diffusion flowmetry (TDF) in our neurointensive care unit. We aimed to examine the correlation between GCS, ICP, rCoBF, and outcome in response to treatment.…”

Section: Introductionmentioning

confidence: 99%

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Continuous regional cerebral blood flow monitoring in the neurosurgical intensive care unit

Lee

Chen

Lee

2005

Journal of Clinical Neuroscience

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Continuous regional cerebral blood flow monitoring in the neurosurgical intensive care unit

Lee

Chen

Lee

2005

Journal of Clinical Neuroscience

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“…It is being used for postoperative monitoring of blood flow and for the monitoring of blood flow in arterial occlusions during operations on cerebral aneurysms 66, 67). Moreover, the continuous measurement of cortical blood flow of the brain has also been attempted in head injury cases 6s) Recently, the use of this method in head injury and aneurysm patients in intensive care units has also been reported [69][70][71][72]. This method has also been used to measure finger blood flow in experimental research in humans 56-58, v3, 74) Miyakita et al TM have observed the influence of noise, vibration and static load on peripheral circulation while healthy subjects operated a chainsaw.…”

Section: ) Clinical Application Of the Thermal Diffusion Methodsmentioning

confidence: 99%

Development of noninvasive measurement of peripheral circulation and its medical application

Nakamura

1997

Environ Health Prev Med

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Surveys were carried out on tissue blood flow measurement based on the thermal diffusion method and on the assessment of peripheral circulatory function using photosensors.Regarding the thermal diffusion method, first noninvasive measurement using a Peltier stack was carried out. Then, measurements using a thermal clearance curve at various temperatures were performed.For noninvasive measurement of the mechanical properties of peripheral arteries using photosensors, the author determined the vascular volume ratio and/or the relative vascular volume.For clinical application in field studies, it is necessary to develop an apparatus with which absolute evaluation of the intravascular volume can be carried out using the blood volume around the unit volume as an indicator. Therefore, an apparatus that removes a signal constituent from tissue other than the blood using two-wavelength photosensors is required.If a noninvasive method to accurately measure the intravascular volume is established, changes in the mechanical properties of the peripheral arteries that correspond to functional and organic changes in the normal response can be observed more directly. Moreover, quantitative assessment of peripheral circulatory function will become possible, and diagnosis of the severity of peripheral circulatory disorders will be facilitated.

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“…The main advantage of TD is, that measurements are continuous, the disadvantage being that only local information is obtained; however, a correlation with global measurements using the Kety-Schmidt technique has been reported. 36 Other authors have not been able to establish a correlation between local thermal diffusion measurements and global and regional CBF measurements obtained by stable Xe-CT in head-injured patients. 37 Recently, an improved version of this technique using an intraparenchymal probe with thermistors has been evaluated in brain injured patients.…”

Section: Quantitative Cbf Measurementsmentioning

confidence: 98%

Should we measure cerebral blood flow in head-injured patients?

Steiner

Czosnyka

2002

British Journal of Neurosurgery

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Inadequate cerebral blood flow (CBF) after head injury is an important cause of secondary ischaemic damage. Rapid identification of episodes of hypo- or hyperperfusion would allow timely intervention and would possibly improve outcome. Despite a large number of methods to estimate CBF, this concept is only marginally implemented in clinical practice. The methods to detect such episodes are limited for technical reasons, but also because the thresholds of ischaemia and hyperaemia are variable after head injury. Furthermore, we are not always able to manipulate CBF in a controlled manner. Accordingly, it is not surprising that attempts to compare a CBF-targeted strategy with another management option have failed to demonstrate a clear benefit. Methods need to be developed that allow either identification of thresholds for critically low or high CBF in individual patients, allow monitoring oxygen extraction fraction, representing circulatory reserve, or alternatively provide a measure of the volume of ischaemic or hyperaemic brain.

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Cerebral Blood Flow (CBF) Monitoring in Intensive Care by Thermal Diffusion

Cited by 14 publications

References 7 publications

Continuous regional cerebral blood flow monitoring in the neurosurgical intensive care unit

Continuous regional cerebral blood flow monitoring in the neurosurgical intensive care unit

Development of noninvasive measurement of peripheral circulation and its medical application

Should we measure cerebral blood flow in head-injured patients?

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