To the Editor: We congratulate Dr Carlsson et al on their work on the safety of percutaneous coronary interventions (PCI) in an hospital with or without on-site cardiac surgery standby, albeit their study raises several concerns. First, the majority of patients (nearly 80%) had one- or two-vessel disease and as depicted in table 2 in their paper only around 15% of patients had two or more vessels treated. No fundamental data as to the type of culprit vessels (whether left anterior descending coronary artery or posterior descending coronary artery or a minor diagonal branch) or the baseline ejection fraction were provided in the study.
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