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Brigham and Women's Hospital answeredThis is a very common symptom and not necessarily a sign of a major heart problem. If you experience sudden increases in your heart rate and if you feel lightheaded or lose consciousness during these spells, such symptoms require expeditious evaluation. One approach to finding out what is behind these symptoms involves a complete history and physical examination, and often the use of a device known as an "event monitor" that can transmit a record of the heartbeat (electrocardiogram) by telephone, allowing the cardiologist to make a precise diagnosis if there is an abnormal rhythm. The management strategy depends on the results of the clinical evaluation and capturing any abnormal heartbeat on the event monitor.