Heart 1997;78:423-425 ( November )
Editorial
Delayed protection against ventricular arrhythmias by cardiac pacing
| The first 150 words of the full text of this article appear below. |
Although heavy physical exercise, and psychological stress that produces similar physiological responses, may trigger a cardiac event in the immediate (within one hour) postexertion period,1,2 there is prospective evidence that the relative risk of sudden cardiac death and non-fatal myocardial infarction occurring during this period is reduced in individuals who exercise regularly.2,3 The intensity of the exercise required to induce this protection, as well as the time course of this protection, are subjects of ongoing debate3,4; the conclusion that "the protective effect of exercise requires continued exertion"3 implies that the duration of the protection is relatively short lived. The mechanisms of this risk reduction remain unclear but include an increase in baroreflex sensitivity (and increased vagal activity that is antifibrillatory5) and favourable effects on other risk factors.6
Both exercise training7 and right ventricular
pacing8,9 confer significant protection against coronary
artery occlusion induced ventricular fibrillation in
conscious7 and anaesthetised8,9
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