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Blackouts can also be caused by a variety of drugs and other substances including: Alcohol intoxication. Medication side effects, such as the side effects of cancer treatments or seizure medications, or agents used for anesthesia. Poisons, such as cleaning chemicals or pesticides.
If it is an irregular heart beat (arrhythmia, your heart may have been too slow or too fast. In either situation, the blood flow to your body and especially your brain can become insufficient, causing the black-out. You can read about this here: http://www.cardiac-risk-assessment.com/heart-information/palpitations