Archive for August, 2008
August 31st, 2008 2:08:43
A Prospective Pediatric Clinical Trial of Digital Music Players: Do They Interfere with Pacemakers?
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A Prospective Pediatric Clinical Trial of Digital Music Players: Do They Interfere with Pacemakers?
J Cardiovasc Electrophysiol. 2008 Aug 6;
Authors: Chiu CC, Huh J, DE Souza L, Alfaro-Ramirez A, Clegg R, Fenwick L, Hamilton RM, Kirsh JA, Gross GJ, Gao D, Stephenson EA
Background: There has been recent concern in the media about iPodtrade mark interference with pacemakers. We systematically tested two types of digital music players (DMP) on pacemaker or ICD function in children. Methods/Results: Patients were monitored by a 6-lead ECG and programmer telemetry. The pacemaker was tested in bipolar and unipolar sensing at normal and maximal sensitivities. The order of DMP tested was randomized. Each DMP was placed on top of the pacemaker pocket, put into “play” mode three times (5 seconds each), with and without programmer wand placed one cm adjacent to DMP. Pacemaker interference was defined as: pacing inhibition, inappropriate pacing, oversensing, or detection of high-rate episodes associated with the use of DMP. Of the 67 patients (mean age 12 +/- 5 years), 62 had pacemakers and five had ICDs; 39 endocardial and 28 epicardial systems. Patients were tested with Sansatrade mark (67), iPodtrade mark 30 GB (51), and other DMPs (43). There was no evidence of interference with pacemaker function by any DMP under any of the study conditions (each performed in triplicate). Reproducible programmer telemetry interference was shown in 11 cases (Medtronic 6/47, St. Jude Medical 5/18, Guidant 0/2) related to use of iPodtrade mark (6), Sansatrade mark (1), or others (4). None of these were associated with any evidence of pacemaker malfunction. Conclusion: Interference with pacemaker function could not be shown with iPodtrade mark or MP3 players. No additional precaution beyond standard is necessary for patients with pacemakers when they are using these players.
PMID: 18691233 [PubMed - as supplied by publisher]
August 30th, 2008 23:08:34
Planetary science: music of the stratospheres.
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Planetary science: music of the stratospheres.
Nature. 2008 May 8;453(7192):163-4
Authors: Dowling TE
PMID: 18464726 [PubMed - in process]
August 27th, 2008 15:08:58
Decrease in early right alpha band phase synchronization and late gamma band oscillations in processing syntax in music.
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Decrease in early right alpha band phase synchronization and late gamma band oscillations in processing syntax in music.
Hum Brain Mapp. 2008 Jun 20;
Authors: Ruiz MH, Koelsch S, Bhattacharya J
The present study investigated the neural correlates associated with the processing of music-syntactical irregularities as compared with regular syntactic structures in music. Previous studies reported an early ( approximately 200 ms) right anterior negative component (ERAN) by traditional event-related-potential analysis during music-syntactical irregularities, yet little is known about the underlying oscillatory and synchronization properties of brain responses which are supposed to play a crucial role in general cognition including music perception. First we showed that the ERAN was primarily represented by low frequency (<8 Hz) brain oscillations. Further, we found that music-syntactical irregularities as compared with music-syntactical regularities, were associated with (i) an early decrease in the alpha band (9-10 Hz) phase synchronization between right fronto-central and left temporal brain regions, and (ii) a late ( approximately 500 ms) decrease in gamma band (38-50 Hz) oscillations over fronto-central brain regions. These results indicate a weaker degree of long-range integration when the musical expectancy is violated. In summary, our results reveal neural mechanisms of music-syntactic processing that operate at different levels of cortical integration, ranging from early decrease in long-range alpha phase synchronization to late local gamma oscillations. Hum Brain Mapp 2008. (c) 2008 Wiley-Liss, Inc.
PMID: 18571796 [PubMed - as supplied by publisher]
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