OBJECTIVE:To investigate the characteristics and causes of cardiac ADR induced by quinolones,and to provide reference for clinical treatment. METHODS:Three thousaud two hundred and eighty-eighe 8 patients receiving common quinolones were selected from clinical departments in Zhengzhou Central Hospital of Zhengzhou University during Mar. 2012-Mar. 2016. Retro-spective analysis was conducted in terms of patients’age and gender,clinical departments,main clinical manifestations,route of administration,underlying disease,drug combination. The reasons for cardiac ADR were analyzed. RESULTS:Among 3 288 pa-tients,there were 34 patients(1.03%)with cardiac ADR. Among them,the incidence of cardiac ADR in patients over 50 years old was as high as 76.47%;patients with cardiac ADR were mainly in the respiration department,gastroenterology department and urology department,accounting for 76.47%;most of patients were from gastroenterology department(29.41%). In cardiac ADR, the main clinical manifestations were QTc interval prolongation torsadesde poiutes(TdP)and TdP,accounting for 58.82%. Among them,patients with QTc interval prolongation TdP occupied the highest proportion,there was no statistical significance compared to TdP(P>0.05);there was statistical significance in the difference with other clinical manifestations(P<0.05). Among common-ly used quinolones,levofloxacin(32.35%)and ciprofloxacin(41.18%)caused large proportion of cardiac ADR,there was statisti-cal significance compared to norfloxacin,moxifloxacin and other quinolones(P<0.05). The proportion of cardiac ADR induced by intravenous dripping(91.18%)was much higher than oral administration(8.82%),with statistical significance(P<0.05). Among patients with cardiac ADR,the patients with underlying disease (94.12%) and drug combination (91.18%) occupied the higher proportion,there was statistical significance compared to the patients without underlying disease and drug combination(P<0.01). Among drug combination,the patients receiving amiodarone (29.41%) and salbutamol (20.59%) occupied the large proportion, there was statistical significance compared to other types of drug combination(P<0.05). CONCLUSIONS:Cardiac ADR induced by quinolones in our hospital mostly occurs in respiration department,gastroenterology department and urology department,and mainly manifests as QTc interval prolongation TdP and TdP. The incidence of cardiac ADR may be greatly increased in elderly pa-tients,patients with underlying diseases,and drug combination as well as intravenous infusion. Therefore,clinicians should select suitable quinolones,and make reasonable individualized dosage regimen.