In atrial fibrillation, the atria beat irregularly. In atrial flutter, the atria beat regularly, but faster than usual and more often than the ventricles, so you may have four atrial beats to every one ventricular beat. Cannabinoids have a complicated relationship with heart and lung conditions, as their effect can depend upon the dosage and the type of cannabinoids used. It is conceivable that, as cannabinoids can control many of the body’s physiological processes, this includes heart rate. There is some evidence that THC can increase heart rate initially, followed by a decrease after the first 30 minutes to 1 hour.
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