Inclusion Criteria
The Nationwide Inpatient Sample (NIS) through the HCUP (Healthcare Cost
and Utilization Project) records data from over 7 million
hospitalizations each year. Information from the database was collected
and analyzed in this review. Patients who underwent CABG or
cardiopulmonary bypass from 2005 to 2014 were identified by the ICD-9
procedure codes: 36.10 to 36.19 and 39.61 to 39.66. CABG procedure types
were stratified as either elective or urgent/emergent. Appropriate ICD-9
V codes were used to identify those with a history of kidney transplant
(ICD-9 code: V42.0), pancreas transplant (ICD-9 code: V428.3), and both
pancreas and kidney transplant. Those with history of or complication
from another organ transplant were excluded. Basic patient demographic
information and hospital characteristics were also collected. Transplant
centers were defined as having performed at least one renal transplant
between 2005 to 2014. The Elixhauser comorbidity index scores were
calculated using preexisting medical conditions available in the NIS
data18.