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- Q16986124 subject Q7142278.
- Q16986124 subject Q8784734.
- Q16986124 abstract "Heart rhythm disturbances have been seen among astronauts. Most of these have been related to cardiovascular disease, but it is not clear whether this was due to pre-existing conditions or effects of space flight. It is hoped that advanced screening for coronary disease has greatly mitigated this risk. Other heart rhythm problems, such as atrial fibrillation, can develop over time, necessitating periodic screening of crewmembers’ heart rhythms. Beyond these terrestrial heart risks, some concern exists that prolonged exposure to microgravity may lead to heart rhythm disturbances. Although this has not been observed to date, further surveillance is warranted.The incidence and clinical significance of cardiac arrhythmias during long-term exposure to microgravity experienced on the International Space Station (ISS) or during a prolonged (that is, up to 3 years) sojourn to Mars or on the Moon are a concern for the National Aeronautics and Space Administration (NASA). At present, there are only anecdotal reports of cardiac arrhythmias in space, including one documented episode of non-sustained ventricular tachycardia. However, the potential catastrophic nature of a sudden cardiac death in the remote, but highly public, environment of space flight has led to continued concern since the early days of the space program over the possibility that space flight might be arrhythmogenic. Indeed, there are known and well-defined changes in the cardiovascular system with space flight: plasma volume is reduced; left ventricular mass in decreased; the autonomic nervous system adapts to the microgravity environment.Combined, these physiologic adaptations suggest that changes in cardiac structure and neurohumoral environment during space flight could alter electrical conduction, although the evidence supporting this contention consists mostly of minor changes in QT interval in a small number of astronauts after long-duration space flight. Concurrent with efforts by Flight Medicine to improve screening techniques, as NASA enters the era of exploration class missions, it will be critical to determine with the highest degree of certainty whether space flight by itself alters cardiac structure and function sufficiently to increase the risk for arrhythmias. This undertaking must be done in a highly systematic way.".
- Q16986124 thumbnail Cardiac_Figure_1.jpg?width=300.
- Q16986124 wikiPageExternalLink cohen.pdf.
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- Q16986124 wikiPageWikiLink Q7142278.
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- Q16986124 wikiPageWikiLink Q844935.
- Q16986124 wikiPageWikiLink Q8784734.
- Q16986124 comment "Heart rhythm disturbances have been seen among astronauts. Most of these have been related to cardiovascular disease, but it is not clear whether this was due to pre-existing conditions or effects of space flight. It is hoped that advanced screening for coronary disease has greatly mitigated this risk. Other heart rhythm problems, such as atrial fibrillation, can develop over time, necessitating periodic screening of crewmembers’ heart rhythms.".
- Q16986124 label "Cardiac rhythm problems during space flight".
- Q16986124 depiction Cardiac_Figure_1.jpg.