| 1. |
- Holm, Magnus, et al.
(författare)
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A Computer Algorithm for Determining Local Activation Times in Electrograms Obtained during Atrial Fibrillation
- 1993
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Ingår i: Proc. IEEE Computers in Cardiology, London, 5-8 Sep 1993. ; , s. 855-858
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Konferensbidrag (refereegranskat)abstract
- A critical factor in analyzing the propagation of activation waves in the myocardium is the definition of local activation times (LAT) in the electrogram. The authors have formulated and tested a definition of LAT in bipolar electrograms applicable to atrial electrograms containing deflections with wide variation in complexity, e.g. those obtained during rapid, irregular atrial rhythm, i.e. atrial fibrillation. The definition, implemented as an algorithm in a computer program, consists of two parts: the first part identifies local activations in the electrogram and the second calculates the corresponding LAT using criteria that define the LAT as the median activation time of cells located between the bipolar electrodes.
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| 2. |
- Holm, Magnus, et al.
(författare)
-
Determination of Preferable Wavelet Propagation Directions in Atrial Fibrillation
- 1993
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Konferensbidrag (refereegranskat)abstract
- M. Holm, P. Blomström, J. Brandt, R. Johansson, C. Lührs, and S. B. Olsson. Determination of preferable wavelet propagation directions in atrial fibrillation. In Erik K. Fernström Symp. Atrial Fibrillation, Lund, Sweden, June 1993.
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| 3. |
- Magnusson, Måns, et al.
(författare)
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Dynamic Properties of Feedback Control of Human Posture in Subjects with Vestibular Neuritis
- 1993
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Ingår i: Acta Oto-Laryngologica. - : Informa UK Limited. - 1651-2251 .- 0001-6489. ; 113:S503, s. 47-48
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Tidskriftsartikel (refereegranskat)abstract
- Postural control was studied in 22 subjects with vestibular neruitis within 14 days after the onset of symptoms. Dynamic feed back control of posture were evaluated by analyzing the postural responses to vibration toward calf muscles applied according to a PRBS schedule. Properties of the dynamic control was normalized as swiftness, stiffness and damping of the responses. There was no prominent group differences between the 22 subjects with vestibular neuritis and 17 normal subjects. However, when studying the change in parameters evoked by presence or absence of visual information it was found that the abundant changes of control parameters, especially in stiffness, met in normal subjects had declined in subjects with vestibular neuritis. The present finding suggests that although subjects after an acute vestibular lesion may achieve a sufficient postural control by utilizing information from other somatosensory receptors, this is concomitant with changes of the feed back control.
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