We had included only the patients with cardiac tamponade, excluded those coded for pericardial effusion. The feasibility of comparison of the databases of two regions needs to be evaluated. There are some inherent limitations for the studies carried out from the National In-patient Samples (NIS) database.
© 2024 The Authors. Journal of Arrhythmia published by John Wiley & Sons Australia, Ltd on behalf of Japanese Heart Rhythm Society.