Limitations
This study has several limitations. This study is retrospective in
design and not randomized. As such, its results may be prone to
selection bias which may have influenced the results. The causes of
prolonged CPB times were not captured in this data registry but may
influence the results. Similarly, details regarding surgical judgement
including technical details and use of mechanical support could not be
captured. Other factors prone to variability such as intensive care unit
care and surgeon experience could potentially confound results as well.
Finally, the generalizability of these outcomes to other centers is
unknown.