Limitations:
Being an administrative database, NRD is subjected to coding errors.
pLAAC is an operator-dependent procedure. NRD does not have information
regarding the type and size of the device used, echocardiographic
findings, pre, and post-procedure imaging results. Patients readmitted
to another state cannot be traced in the NRD, and mortality data cannot
be calculated outside the hospital after discharge. Despite all the
limitations, our analysis results are in accordance with the data
reported in previous studies. [9, 10, 19] Because it uses an
enormous sample size, it can also provide insights into uncommon risk
factors, a limitation of a single-center cohort study.