To the Editor On behalf of our coauthors, we write to report errors and the need for corrections to our article “Hospital Volume Outcomes After Septal Myectomy and Alcohol Septal Ablation for Treatment of Obstructive Hypertrophic Cardiomyopathy: US Nationwide Inpatient Database, 2003-2011,” published in the June 2016 issue of JAMA Cardiology.1 As we previously reported,2 there was a typographical error in the original article regarding the International Classification of Diseases, Ninth Revision codes. We used International Classification of Diseases, Ninth Revision procedure codes 37.33 (excision of heart tissue) and 37.34 (ablation of heart tissue) to identify patients undergoing septal myectomy and American Society of Anesthesiologists score, respectively. The errors affected data reported on uncomplicated diabetes, Medicare payer, medium hospital size, concomitant coronary artery bypass graft (CABG), and concomitant valve surgery in Table 1 and for anemia in Table 2.1 For concomitant CABG and concomitant valve surgery characteristics, we previously listed a number of CABG (or valve) operations within each tertile divided by a number of total CABG (or valve) operations rather than percentages. The corrected percentages (number of CABG or valve operations) within each tertile divided by a number of total septal myectomy cases in each tertile now appear in the corrected article.3
The findings and conclusions of this study remain unchanged, suggestive that institutional volumes of septal myectomy and alcohol septal ablation are associated with in-hospital outcomes. We apologize to the readers and the editors of JAMA Cardiology for any confusion these errors may have caused.
Corresponding Author: Luke K. Kim, MD, Division of Cardiology, Department of Medicine, Weill Cornell Medical College, New York Presbyterian Hospital, 520 E 70th St, Starr Pavilion, 4th Floor, New York, NY 10021 (email@example.com).
Published Online: January 4, 2017. doi:10.1001/jamacardio.2016.5225
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Kim LK, Feldman DN. Errors in ICD-9 Codes and Percentages Reported in Tables. JAMA Cardiol. Published online January 04, 2017. doi:10.1001/jamacardio.2016.5225