Osborn wave and new-onset atrial fibrillation related to hypothermia after synthetic cannabis (bonsai) abuse.

An Osborn wave may be observed on an electrocardiogram (ECG) as a late delta wave at the end of the QRS complex in cases of hypothermia. An 18-year-old male known to be a synthetic cannabinoid user was found unconscious and hypothermic. The patient's body temperature was 33ºC, and an Osborn wave and atrial fibrillation were detected in ECG readings. Following the application of heating and supportive therapy, consciousness returned and the ECG findings improved. Rewarming and supportive treatment can be life-saving in a hypothermic patient when initiated as soon as possible.