Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

Example Input: We presented a patient with status asthmaticus treated with a combination of theophylline and prednisone who developed a perforated gastric ulcer.
Example Output: adverse drug event

Example Input: This is a rare complication of bypass surgery and may be a cause of recurrent angina postoperatively due to coronary artery steal.
Example Output: non-adverse drug event

Example Input: Four patients in whom pulmonary oedema developed during tocolysis with hexoprenaline are described and the aetiological factors and pathogenesis of this potentially lethal complication discussed.
Example Output:
adverse drug event