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Association of Oral Ciprofloxacin, Levofloxacin, Ofloxacin and Moxifloxacin with the Risk of Serious Ventricular Arrhythmia: a Nationwide Cohort Study in Korea

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Association of Oral Ciprofloxacin, Levofloxacin, Ofloxacin and Moxifloxacin with the Risk of Serious Ventricular Arrhythmia: a Nationwide Cohort Study in Korea Open access Research BMJ Open: first published as 10.1136/bmjopen-2017-020974 on 28 September 2018. Downloaded from Association of oral ciprofloxacin, levofloxacin, ofloxacin and moxifloxacin with the risk of serious ventricular arrhythmia: a nationwide cohort study in Korea Yongil Cho,1 Hyun Soo Park2 To cite: Cho Y, Park HS. ABSTRACT Strengths and limitations of this study Association of oral ciprofloxacin, Objective To evaluate whether oral ciprofloxacin, levofloxacin, ofloxacin levofloxacin, ofloxacin and moxifloxacin increase the risk ► This was a nationwide population-based study that and moxifloxacin with the of ventricular arrhythmia in Korea’s general population. risk of serious ventricular included 4 888 890 patients who were prescribed Design Population-based cohort study using arrhythmia: a nationwide cohort oral fluoroquinolone or cefixime. administrative claims data on a national scale in Korea. study in Korea. BMJ Open ► This is the largest study to date evaluating the as- Setting All primary, secondary and tertiary care settings 2018;8:e020974. doi:10.1136/ sociation between oral fluoroquinolone use and se- from 1 January 2015 to 31 December 2015. bmjopen-2017-020974 rious ventricular arrhythmia. Participants Patients who were prescribed the relevant ► This study adjusted the underlying characteristics ► Prepublication history and study medications at outpatient visits. additional material for this and indications of the antibiotics for both the fluo- Primary outcome measures Each patient group that paper are available online. To roquinolone and cefixime groups using propensity was prescribed ciprofloxacin, levofloxacin, ofloxacin view these files, please visit score weighting. or moxifloxacin was compared with the group that the journal online (http:// dx. doi. ► This study reflected no baseline health information, was prescribed cefixime to assess the risk of serious org/ 10. 1136/ bmjopen- 2017- such as laboratory or ECG data, because we used ventricular arrhythmia (ventricular tachycardia, fibrillation, 020974). health claims data. flutter and cardiac arrest). Using logistic regression ► The number of deaths that occurred during the fol- Received 6 December 2017 analysis with inverse probability of treatment weighting Revised 15 June 2018 low-up period could not be investigated. using the propensity score, OR and 95% CI for serious http://bmjopen.bmj.com/ Accepted 23 August 2018 ventricular arrhythmia were calculated for days 1–7 and 8–14 after the patients commenced antibiotic use. Results During the study period, 4 888 890 patients diseases. Common adverse effects of fluoro- were prescribed the study medications. They included quinolones include gastrointestinal symp- 1 466 133 ciprofloxacin users, 1 141 961 levofloxacin toms, such as diarrhoea and nausea, and users, 1 830 786 ofloxacin users, 47 080 moxifloxacin central nervous system side effects, such as users and 402 930 cefixime users. Between 1 and 1 7 days after index date, there was no evidence of headaches and dizziness. These side effects increased serious ventricular arrhythmia related to the are mild, and fluoroquinolone use is mostly on September 29, 2021 by guest. Protected copyright. prescription of ciprofloxacin (OR 0.72; 95% CI 0.49 to safe; however, rare but serious adverse effects 1.06) and levofloxacin (OR 0.92; 95% CI 0.66 to 1.29). have been reported, including tendon © Author(s) (or their Ofloxacin had a 59% reduced risk of serious ventricular rupture, retinal detachment, aortic aneurysm employer(s)) 2018. Re-use arrhythmia compared with cefixime during 1–7 days and aortic dissection.2–8 permitted under CC BY-NC. No commercial re-use. See rights after prescription. Whereas the OR of serious ventricular Fluoroquinolones also have cardiac and permissions. Published by arrhythmia after the prescription of moxifloxacin was 1.87 side effects. Several studies have reported BMJ. (95% CI 1.15 to 3.11) compared with cefixime during 1–7 QT interval increases after fluoroquino- 1Department of Emergency days after prescription. lone use,9–14 which can lead to ventricular Conclusions During 1–7 days after prescription, Medicine, College of Medicine, arrhythmia. Cases of torsades de pointes Hanyang University, Seoul, ciprofloxacin and levofloxacin were not associated with occurrence associated with fluoroquinolone Republic of Korea increased risk and ofloxacin showed reduced risk of 15–19 2Department of Emergency serious ventricular arrhythmia. Moxifloxacin increased the use have also been reported. Several Medicine, Jeju National risk of serious ventricular arrhythmia. population-based studies also reported University School of Medicine, that fluoroquinolones increased the risk of Jeju, Republic of Korea ventricular arrhythmia or sudden cardiac 20–22 Correspondence to INTRODUCTIOn death. Despite these reports, the associ- Professor Hyun Soo Park; Fluoroquinolones are a broad-spectrum ation of fluoroquinolones with arrhythmia phs0331@ gmail. com antibiotics prescribed for many infectious remains contentious. A recent observational Cho Y, Park HS. BMJ Open 2018;8:e020974. doi:10.1136/bmjopen-2017-020974 1 Open access BMJ Open: first published as 10.1136/bmjopen-2017-020974 on 28 September 2018. Downloaded from study in Denmark and Sweden reported that oral fluoro- during the study period. Patients who were prescribed the quinolone treatment was not associated with the risk of relevant study medications outpatient visits in all primary, serious arrhythmia.23 This study compared 909 656 fluoro- secondary and tertiary care settings were included. quinolone users with 9 09 656 penicillin V users, providing strong statistical power. However, the most frequently Exclusion criteria prescribed fluoroquinolone was ciprofloxacin; thus, the We excluded patients who were hospitalised within 30 risk of arrhythmia by antibiotic type was undetermined. days of the index date, which was defined as the date Previous studies have reported the risk of arrhythmia by on which the study medication was prescribed. We also fluoroquinolone type, but their results differed. excluded patients who were prescribed antibiotics within To clarify this issue, we used a large general population 30 days prior to the index date, who were prescribed database in Korea to examine whether oral ciprofloxacin, medication associated with QT interval prolongation or levofloxacin, ofloxacin or moxifloxacin increased the risk increased risk for developing torsades de pointes from 30 of ventricular arrhythmia compared with the risk associ- days before to 30 days after the index date (see online ated with cefixime. We selected cefixime (an antibiotic supplementary table 2), or who were already diagnosed with no proarrhythmic effect) as a comparison medica- with serious ventricular arrhythmia before the index date. tion because fluoroquinolones and cefixime have over- Outcome definition lapping indications. The outcomes of serious ventricular arrhythmia included ventricular tachycardia, fibrillation, flutter and cardiac arrest. The International Classification of Diseases, 10th METHODS Revision (ICD-10) codes (I472, I490.x, I460, I461 and Study design I469) were used to identify the patients with serious This population-based cohort study included patients ventricular arrhythmias. Only the main diagnostic codes who had been prescribed oral fluoroquinolones (cipro- were used. Because diagnostic codes are sometimes used floxacin, levofloxacin, ofloxacin or moxifloxacin) or in patients with existing arrhythmias, only the first diag- cefixime in the outpatient department from 1 January nosis was used when patients had more than one diag- 2015 to 31 December 2015 (see online supplementary nostic code for serious ventricular arrhythmia to focus table 1). To reduce potential confounding by indica- on incidence outcomes. Because fluoroquinolone and tion, oral cefixime was used as a control. Both fluoro- cefixime are generally recommended to be prescribed quinolones and cefixime are frequently prescribed for for 7–14 days, we used observation periods of 1–7 days respiratory diseases and urinary tract infections (UTIs) and 8–14 days after the index date to evaluate the adverse in Korea. Other studies used β-lactam antibiotics, such effects of these medications. These periods were chosen as amoxicillin, amoxicillin–clavulanate and penicillin V, 21–23 because acute side effects from the drug can develop as controls. However, in Korea, β-lactam antibiotics during the administration period. Follow-up began on the http://bmjopen.bmj.com/ are not commonly used in UTI treatment; thus, cefixime index date and ended on the date of serious arrhythmia was used in this study as a comparator. Cefixime is a or 14 days after starting treatment, whichever came first. medication with no proarrhythmic effects and is not in the list of drug-induced QT prolongation or torsades de Covariates pointes.24–29 Covariates were defined by ICD-10 codes (see online supplementary table 3). The diseases included were hyper- Data source and ethics tension, diabetes mellitus, acute myocardial infarction, We analysed claims data from the Health Insurance ischaemic heart disease, cardiomyopathy, valve disorder, on September 29, 2021 by guest. Protected copyright. Review and Assessment (HIRA) in South Korea. HIRA arrhythmia, congestive heart failure, congenital heart examines the medical expense claims data received from disease, cancer, cerebrovascular disease, renal disease, the National Health Insurance (NHI) and the appropri- arterial
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