Second, our study could not confirm the temporal relationship of the ventricular arrhythmia or cardiac arrest event relative to ceftriaxone and lansoprazole treatment, because the study data did not capture the specific date and time for the ventricular arrhythmia or cardiac arrest event. We specified that this outcome must have occurred postadmission and ceftriaxone or PPI therapy was initiated in more than 84% of patients within 1 day of admission, suggesting it was unlikely for the outcome to occur prior to the exposure. Moreover, the sensitivity analysis that included only patients who received ceftriaxone and a PPI within 1 day of admission showed similar results (eTable 14 in Supplement 1).