The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals.

The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals. Abstract Text:

Sverre Holm,Per Kristian Eide,Sverre Holm,Per Kristian Eide,

Two methods for analyzing intracranial pressure (ICP) waveforms were compared. The frequency domain (FD) method converts the signal from the time domain to the frequency domain by a fast Fourier transform (FFT), while the time domain (TD) method calculates peak-to-peak value of the pulse waveform directly from the time samples. First, the ICP signal was regenerated from the first harmonic of the FFT and compared against the time domain raw ICP signal. We found that the FD method may underestimate pulse amplitude if there is heart rate variability or a high harmonic distortion. Second, to explore the significance in a larger data set, differences between FD- and TD-derived pulse amplitudes were determined for a total of 50,978 6-s time windows of 79 head injury patients. The mean difference in pulse pressure amplitude was 2.9mmHg for the 50,978 6-s time windows. Differences between TD- and FD-derived pulse amplitudes were >/=2.0mmHg in 58.8% of the 50,978 time windows. In about 33% of time windows FD amplitudes were <2mmHg when TD amplitudes were >/=4mmHg, and vice versa. Hence, the TD method is superior to the FD method for calculation of pulse amplitudes. Nevertheless, in this material both the TD and FD methods revealed significantly elevated pulse amplitudes in head injury patients with bad outcome (i.e. Glasgow Outcome Score 1-3).

The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals. Publishing Authors By Initials

S Holm,PK Eide,S Holm,PK Eide,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Medical engineering & physics

VOLUME: 30

Page Numbers: 164-70

Journal Abbreviation:

ISSN: 1350-4533

DAY: 30

MONTH: 04

YEAR: 2007

The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9422753

The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals.

AFFILIATION: Department of Informatics, University of Oslo, Oslo, Norway.

Country: England

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Med Eng Phys

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

The frequency domain versus time domain methods for processing of intracranial pressure ICP signals Related Publications

• A histochemical study of the oxidation of 17 -estradiol in human term placenta at different incubation conditions. An investigation with the polyvinyl alcohol method.
• Acute disseminated phycomycosis in a patient with impaired neutrophil granulocyte function.
• Attributable fractions with survival data.
• Biometric measurements of the eyes in teenagers and young adults with Down syndrome.
• Comparison of simultaneous continuous intracranial pressure (ICP) signals from ICP sensors placed within the brain parenchyma and the epidural space.
• Distribution of atherosclerosis in human descending thoracic aorta. A morphometric study.
• HEMATOLOGIC AND CYTOGENIC EVIDENCE FOR CHIMERISM IN THE MARMOSET, TAMARINUS NIGRICOLLIS. SAM-TDR-64-61.
• Letter: Malignant carcinoid tumour with gangrene of the small intestine.
• Mutations in the RAD27 and SGS1 genes differentially affect the chronological and replicative lifespan of yeast cells growing on glucose and glycerol.
• Prevalence of probable idiopathic normal pressure hydrocephalus in a Norwegian population.
• Primary laser photocoagulation of "small" choroidal melanomas.
• Regulation of the yeast TSA1 peroxiredoxin by ZAP1 is an adaptive response to the oxidative stress of zinc deficiency.
• The frequency domain versus time domain methods for processing of intracranial pressure (ICP) signals.
• The probability of overlooking prostatic cancer in transurethrally resected material when different embedding practices are followed.
• [Angioimmunoblastic lymphadenopathy with dysproteinemia. A case report and a review of the literature]
• [Aspiration cytology of the breast]
• [Effect of physical activity on emotional reactions, reactions to stress and related physiologic reactions]
• [Epilepsy and the driving license]
• [Glossopharyngeal neuralgia]
• [Health education in the communities. A survey conducted in 1987]
• [Humanity and biotechnology--hearing statement of the Medical Society]
• [In Process Citation]
• [Meckel's diverticulum]
• [Muscle biopsies. Examination with computer-assisted morphometry]
• [Occurrence of recurrence after regression of low-grade dysplasia in vaginal cytological smears]
• [Pain surgery seen from the physiologic point of view]
• [Relations between body image, self concept and physical activity]
• [Salt and blood pressure in a male population from Sogn and Fjordane counties]
• [The Tallqvist hemoglobin scale -- a diagnostic aid?]
• [Use of hypnotics in geriatric institutions in Hordaland and Sogn and Fjordane]