text: is holiday heart syndrome harmful to your health?   holiday heart may be harmful to your overall health.  "this type of arrhythmia, atrial fibrillation, develops when muscles in the heart's upper chambers contract too quickly, resulting in an irregular heartbeat. blood is then not adequately pumped from the heart, and may pool and form clots. blood clots that travel to the brain result in a stroke. statistics show that having atrial fibrillation results in a fivefold increase in the chance of having a stroke."  - article below  i say, why take a chance with your long-term health when simply have a drink or three less negates the problem?